4

Pods/MJRefresh/MJRefresh/Custom/Footer/Auto/MJRefreshAutoGifFooter.h

@@ -0,0 +1,25 @@
+//
+//  MJRefreshAutoGifFooter.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshAutoStateFooter.h>)
+#import <MJRefresh/MJRefreshAutoStateFooter.h>
+#else
+#import "MJRefreshAutoStateFooter.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshAutoGifFooter : MJRefreshAutoStateFooter
+@property (weak, nonatomic, readonly) UIImageView *gifView;
+
+/** 设置state状态下的动画图片images 动画持续时间duration*/
+- (instancetype)setImages:(NSArray *)images duration:(NSTimeInterval)duration forState:(MJRefreshState)state;
+- (instancetype)setImages:(NSArray *)images forState:(MJRefreshState)state;
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Footer/Auto/MJRefreshAutoGifFooter.m

@@ -0,0 +1,121 @@
+//
+//  MJRefreshAutoGifFooter.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshAutoGifFooter.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+#import "UIScrollView+MJExtension.h"
+#import "UIScrollView+MJRefresh.h"
+
+@interface MJRefreshAutoGifFooter()
+{
+    __unsafe_unretained UIImageView *_gifView;
+}
+/** 所有状态对应的动画图片 */
+@property (strong, nonatomic) NSMutableDictionary *stateImages;
+/** 所有状态对应的动画时间 */
+@property (strong, nonatomic) NSMutableDictionary *stateDurations;
+@end
+
+@implementation MJRefreshAutoGifFooter
+#pragma mark - 懒加载
+- (UIImageView *)gifView
+{
+    if (!_gifView) {
+        UIImageView *gifView = [[UIImageView alloc] init];
+        [self addSubview:_gifView = gifView];
+    }
+    return _gifView;
+}
+
+- (NSMutableDictionary *)stateImages
+{
+    if (!_stateImages) {
+        self.stateImages = [NSMutableDictionary dictionary];
+    }
+    return _stateImages;
+}
+
+- (NSMutableDictionary *)stateDurations
+{
+    if (!_stateDurations) {
+        self.stateDurations = [NSMutableDictionary dictionary];
+    }
+    return _stateDurations;
+}
+
+#pragma mark - 公共方法
+- (instancetype)setImages:(NSArray *)images duration:(NSTimeInterval)duration forState:(MJRefreshState)state
+{
+    if (images == nil) return self;
+    
+    self.stateImages[@(state)] = images;
+    self.stateDurations[@(state)] = @(duration);
+    
+    /* 根据图片设置控件的高度 */
+    UIImage *image = [images firstObject];
+    if (image.size.height > self.mj_h) {
+        self.mj_h = image.size.height;
+    }
+    return self;
+}
+
+- (instancetype)setImages:(NSArray *)images forState:(MJRefreshState)state
+{
+    return [self setImages:images duration:images.count * 0.1 forState:state];
+}
+
+#pragma mark - 实现父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+    // 初始化间距
+    self.labelLeftInset = 20;
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.gifView.constraints.count) return;
+    
+    self.gifView.frame = self.bounds;
+    if (self.isRefreshingTitleHidden) {
+        self.gifView.contentMode = UIViewContentModeCenter;
+    } else {
+        self.gifView.contentMode = UIViewContentModeRight;
+        self.gifView.mj_w = self.mj_w * 0.5 - self.labelLeftInset - self.stateLabel.mj_textWidth * 0.5;
+    }
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 根据状态做事情
+    if (state == MJRefreshStateRefreshing) {
+        NSArray *images = self.stateImages[@(state)];
+        if (images.count == 0) return;
+        [self.gifView stopAnimating];
+        
+        self.gifView.hidden = NO;
+        if (images.count == 1) { // 单张图片
+            self.gifView.image = [images lastObject];
+        } else { // 多张图片
+            self.gifView.animationImages = images;
+            self.gifView.animationDuration = [self.stateDurations[@(state)] doubleValue];
+            [self.gifView startAnimating];
+        }
+    } else if (state == MJRefreshStateNoMoreData || state == MJRefreshStateIdle) {
+        [self.gifView stopAnimating];
+        self.gifView.hidden = YES;
+    }
+}
+@end
+

Pods/MJRefresh/MJRefresh/Custom/Footer/Auto/MJRefreshAutoNormalFooter.h

@@ -0,0 +1,25 @@
+//
+//  MJRefreshAutoNormalFooter.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshAutoStateFooter.h>)
+#import <MJRefresh/MJRefreshAutoStateFooter.h>
+#else
+#import "MJRefreshAutoStateFooter.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshAutoNormalFooter : MJRefreshAutoStateFooter
+@property (weak, nonatomic, readonly) UIActivityIndicatorView *loadingView;
+
+/** 菊花的样式 */
+@property (assign, nonatomic) UIActivityIndicatorViewStyle activityIndicatorViewStyle MJRefreshDeprecated("first deprecated in 3.2.2 - Use `loadingView` property");
+@end
+
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Footer/Auto/MJRefreshAutoNormalFooter.m

@@ -0,0 +1,81 @@
+//
+//  MJRefreshAutoNormalFooter.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshAutoNormalFooter.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+#import "UIScrollView+MJExtension.h"
+#import "UIScrollView+MJRefresh.h"
+
+@interface MJRefreshAutoNormalFooter()
+@property (weak, nonatomic) UIActivityIndicatorView *loadingView;
+@end
+
+@implementation MJRefreshAutoNormalFooter
+#pragma mark - 懒加载子控件
+- (UIActivityIndicatorView *)loadingView
+{
+    if (!_loadingView) {
+        UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:_activityIndicatorViewStyle];
+        loadingView.hidesWhenStopped = YES;
+        [self addSubview:_loadingView = loadingView];
+    }
+    return _loadingView;
+}
+
+- (void)setActivityIndicatorViewStyle:(UIActivityIndicatorViewStyle)activityIndicatorViewStyle
+{
+    _activityIndicatorViewStyle = activityIndicatorViewStyle;
+    
+    [self.loadingView removeFromSuperview];
+    self.loadingView = nil;
+    [self setNeedsLayout];
+}
+#pragma mark - 重写父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
+    if (@available(iOS 13.0, *)) {
+        _activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
+        return;
+    }
+#endif
+        
+    _activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.loadingView.constraints.count) return;
+    
+    // 圈圈
+    CGFloat loadingCenterX = self.mj_w * 0.5;
+    if (!self.isRefreshingTitleHidden) {
+        loadingCenterX -= self.stateLabel.mj_textWidth * 0.5 + self.labelLeftInset;
+    }
+    CGFloat loadingCenterY = self.mj_h * 0.5;
+    self.loadingView.center = CGPointMake(loadingCenterX, loadingCenterY);
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 根据状态做事情
+    if (state == MJRefreshStateNoMoreData || state == MJRefreshStateIdle) {
+        [self.loadingView stopAnimating];
+    } else if (state == MJRefreshStateRefreshing) {
+        [self.loadingView startAnimating];
+    }
+}
+
+@end

Pods/MJRefresh/MJRefresh/Custom/Footer/Auto/MJRefreshAutoStateFooter.h

@@ -0,0 +1,30 @@
+//
+//  MJRefreshAutoStateFooter.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/6/13.
+//  Copyright © 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshAutoFooter.h>)
+#import <MJRefresh/MJRefreshAutoFooter.h>
+#else
+#import "MJRefreshAutoFooter.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshAutoStateFooter : MJRefreshAutoFooter
+/** 文字距离圈圈、箭头的距离 */
+@property (assign, nonatomic) CGFloat labelLeftInset;
+/** 显示刷新状态的label */
+@property (weak, nonatomic, readonly) UILabel *stateLabel;
+
+/** 设置state状态下的文字 */
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state;
+
+/** 隐藏刷新状态的文字 */
+@property (assign, nonatomic, getter=isRefreshingTitleHidden) BOOL refreshingTitleHidden;
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Footer/Auto/MJRefreshAutoStateFooter.m

@@ -0,0 +1,119 @@
+//
+//  MJRefreshAutoStateFooter.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/6/13.
+//  Copyright © 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshAutoStateFooter.h"
+#import "NSBundle+MJRefresh.h"
+
+@interface MJRefreshAutoFooter (TapTriggerFix)
+
+- (void)beginRefreshingWithoutValidation;
+@end
+
+
+@implementation MJRefreshAutoFooter (TapTriggerFix)
+
+- (void)beginRefreshingWithoutValidation {
+    [super beginRefreshing];
+}
+
+@end
+
+@interface MJRefreshAutoStateFooter()
+{
+    /** 显示刷新状态的label */
+    __unsafe_unretained UILabel *_stateLabel;
+}
+/** 所有状态对应的文字 */
+@property (strong, nonatomic) NSMutableDictionary *stateTitles;
+@end
+
+@implementation MJRefreshAutoStateFooter
+#pragma mark - 懒加载
+- (NSMutableDictionary *)stateTitles
+{
+    if (!_stateTitles) {
+        self.stateTitles = [NSMutableDictionary dictionary];
+    }
+    return _stateTitles;
+}
+
+- (UILabel *)stateLabel
+{
+    if (!_stateLabel) {
+        [self addSubview:_stateLabel = [UILabel mj_label]];
+    }
+    return _stateLabel;
+}
+
+#pragma mark - 公共方法
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state
+{
+    if (title == nil) return self;
+    self.stateTitles[@(state)] = title;
+    self.stateLabel.text = self.stateTitles[@(self.state)];
+    return self;
+}
+
+#pragma mark - 私有方法
+- (void)stateLabelClick
+{
+    if (self.state == MJRefreshStateIdle) {
+        [super beginRefreshingWithoutValidation];
+    }
+}
+
+- (void)textConfiguration {
+    // 初始化文字
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshAutoFooterIdleText] forState:MJRefreshStateIdle];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshAutoFooterRefreshingText] forState:MJRefreshStateRefreshing];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshAutoFooterNoMoreDataText] forState:MJRefreshStateNoMoreData];
+}
+
+#pragma mark - 重写父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+    // 初始化间距
+    self.labelLeftInset = MJRefreshLabelLeftInset;
+    
+    [self textConfiguration];
+    
+    // 监听label
+    self.stateLabel.userInteractionEnabled = YES;
+    [self.stateLabel addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(stateLabelClick)]];
+}
+
+- (void)i18nDidChange {
+    [self textConfiguration];
+    
+    [super i18nDidChange];
+}
+
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.stateLabel.constraints.count) return;
+    
+    // 状态标签
+    self.stateLabel.frame = self.bounds;
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    if (self.isRefreshingTitleHidden && state == MJRefreshStateRefreshing) {
+        self.stateLabel.text = nil;
+    } else {
+        self.stateLabel.text = self.stateTitles[@(state)];
+    }
+}
+@end

Pods/MJRefresh/MJRefresh/Custom/Footer/Back/MJRefreshBackGifFooter.h

@@ -0,0 +1,25 @@
+//
+//  MJRefreshBackGifFooter.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshBackStateFooter.h>)
+#import <MJRefresh/MJRefreshBackStateFooter.h>
+#else
+#import "MJRefreshBackStateFooter.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshBackGifFooter : MJRefreshBackStateFooter
+@property (weak, nonatomic, readonly) UIImageView *gifView;
+
+/** 设置state状态下的动画图片images 动画持续时间duration*/
+- (instancetype)setImages:(NSArray *)images duration:(NSTimeInterval)duration forState:(MJRefreshState)state;
+- (instancetype)setImages:(NSArray *)images forState:(MJRefreshState)state;
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Footer/Back/MJRefreshBackGifFooter.m

@@ -0,0 +1,132 @@
+//
+//  MJRefreshBackGifFooter.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshBackGifFooter.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+#import "UIScrollView+MJExtension.h"
+#import "UIScrollView+MJRefresh.h"
+
+@interface MJRefreshBackGifFooter()
+{
+    __unsafe_unretained UIImageView *_gifView;
+}
+/** 所有状态对应的动画图片 */
+@property (strong, nonatomic) NSMutableDictionary *stateImages;
+/** 所有状态对应的动画时间 */
+@property (strong, nonatomic) NSMutableDictionary *stateDurations;
+@end
+
+@implementation MJRefreshBackGifFooter
+#pragma mark - 懒加载
+- (UIImageView *)gifView
+{
+    if (!_gifView) {
+        UIImageView *gifView = [[UIImageView alloc] init];
+        [self addSubview:_gifView = gifView];
+    }
+    return _gifView;
+}
+
+- (NSMutableDictionary *)stateImages
+{
+    if (!_stateImages) {
+        self.stateImages = [NSMutableDictionary dictionary];
+    }
+    return _stateImages;
+}
+
+- (NSMutableDictionary *)stateDurations
+{
+    if (!_stateDurations) {
+        self.stateDurations = [NSMutableDictionary dictionary];
+    }
+    return _stateDurations;
+}
+
+#pragma mark - 公共方法
+- (instancetype)setImages:(NSArray *)images duration:(NSTimeInterval)duration forState:(MJRefreshState)state
+{
+    if (images == nil) return self;
+    
+    self.stateImages[@(state)] = images;
+    self.stateDurations[@(state)] = @(duration);
+    
+    /* 根据图片设置控件的高度 */
+    UIImage *image = [images firstObject];
+    if (image.size.height > self.mj_h) {
+        self.mj_h = image.size.height;
+    }
+    return self;
+}
+
+- (instancetype)setImages:(NSArray *)images forState:(MJRefreshState)state
+{
+    return [self setImages:images duration:images.count * 0.1 forState:state];
+}
+
+#pragma mark - 实现父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+    // 初始化间距
+    self.labelLeftInset = 20;
+}
+
+- (void)setPullingPercent:(CGFloat)pullingPercent
+{
+    [super setPullingPercent:pullingPercent];
+    NSArray *images = self.stateImages[@(MJRefreshStateIdle)];
+    if (self.state != MJRefreshStateIdle || images.count == 0) return;
+    [self.gifView stopAnimating];
+    NSUInteger index =  images.count * pullingPercent;
+    if (index >= images.count) index = images.count - 1;
+    self.gifView.image = images[index];
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.gifView.constraints.count) return;
+    
+    self.gifView.frame = self.bounds;
+    if (self.stateLabel.hidden) {
+        self.gifView.contentMode = UIViewContentModeCenter;
+    } else {
+        self.gifView.contentMode = UIViewContentModeRight;
+        self.gifView.mj_w = self.mj_w * 0.5 - self.labelLeftInset - self.stateLabel.mj_textWidth * 0.5;
+    }
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 根据状态做事情
+    if (state == MJRefreshStatePulling || state == MJRefreshStateRefreshing) {
+        NSArray *images = self.stateImages[@(state)];
+        if (images.count == 0) return;
+        
+        self.gifView.hidden = NO;
+        [self.gifView stopAnimating];
+        if (images.count == 1) { // 单张图片
+            self.gifView.image = [images lastObject];
+        } else { // 多张图片
+            self.gifView.animationImages = images;
+            self.gifView.animationDuration = [self.stateDurations[@(state)] doubleValue];
+            [self.gifView startAnimating];
+        }
+    } else if (state == MJRefreshStateIdle) {
+        self.gifView.hidden = NO;
+    } else if (state == MJRefreshStateNoMoreData) {
+        self.gifView.hidden = YES;
+    }
+}
+@end

Pods/MJRefresh/MJRefresh/Custom/Footer/Back/MJRefreshBackNormalFooter.h

@@ -0,0 +1,25 @@
+//
+//  MJRefreshBackNormalFooter.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshBackStateFooter.h>)
+#import <MJRefresh/MJRefreshBackStateFooter.h>
+#else
+#import "MJRefreshBackStateFooter.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshBackNormalFooter : MJRefreshBackStateFooter
+@property (weak, nonatomic, readonly) UIImageView *arrowView;
+@property (weak, nonatomic, readonly) UIActivityIndicatorView *loadingView;
+
+/** 菊花的样式 */
+@property (assign, nonatomic) UIActivityIndicatorViewStyle activityIndicatorViewStyle MJRefreshDeprecated("first deprecated in 3.2.2 - Use `loadingView` property");
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Footer/Back/MJRefreshBackNormalFooter.m

@@ -0,0 +1,132 @@
+//
+//  MJRefreshBackNormalFooter.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshBackNormalFooter.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+
+@interface MJRefreshBackNormalFooter()
+{
+    __unsafe_unretained UIImageView *_arrowView;
+}
+@property (weak, nonatomic) UIActivityIndicatorView *loadingView;
+@end
+
+@implementation MJRefreshBackNormalFooter
+#pragma mark - 懒加载子控件
+- (UIImageView *)arrowView
+{
+    if (!_arrowView) {
+        UIImageView *arrowView = [[UIImageView alloc] initWithImage:[NSBundle mj_arrowImage]];
+        [self addSubview:_arrowView = arrowView];
+    }
+    return _arrowView;
+}
+
+
+- (UIActivityIndicatorView *)loadingView
+{
+    if (!_loadingView) {
+        UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:_activityIndicatorViewStyle];
+        loadingView.hidesWhenStopped = YES;
+        [self addSubview:_loadingView = loadingView];
+    }
+    return _loadingView;
+}
+
+- (void)setActivityIndicatorViewStyle:(UIActivityIndicatorViewStyle)activityIndicatorViewStyle
+{
+    _activityIndicatorViewStyle = activityIndicatorViewStyle;
+    
+    [self.loadingView removeFromSuperview];
+    self.loadingView = nil;
+    [self setNeedsLayout];
+}
+#pragma mark - 重写父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
+    if (@available(iOS 13.0, *)) {
+        _activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
+        return;
+    }
+#endif
+        
+    _activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    // 箭头的中心点
+    CGFloat arrowCenterX = self.mj_w * 0.5;
+    if (!self.stateLabel.hidden) {
+        arrowCenterX -= self.labelLeftInset + self.stateLabel.mj_textWidth * 0.5;
+    }
+    CGFloat arrowCenterY = self.mj_h * 0.5;
+    CGPoint arrowCenter = CGPointMake(arrowCenterX, arrowCenterY);
+    
+    // 箭头
+    if (self.arrowView.constraints.count == 0) {
+        self.arrowView.mj_size = self.arrowView.image.size;
+        self.arrowView.center = arrowCenter;
+    }
+    
+    // 圈圈
+    if (self.loadingView.constraints.count == 0) {
+        self.loadingView.center = arrowCenter;
+    }
+    
+    self.arrowView.tintColor = self.stateLabel.textColor;
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 根据状态做事情
+    if (state == MJRefreshStateIdle) {
+        if (oldState == MJRefreshStateRefreshing) {
+            self.arrowView.transform = CGAffineTransformMakeRotation(0.000001 - M_PI);
+            [UIView animateWithDuration:self.slowAnimationDuration animations:^{
+                self.loadingView.alpha = 0.0;
+            } completion:^(BOOL finished) {
+                // 防止动画结束后，状态已经不是MJRefreshStateIdle
+                if (self.state != MJRefreshStateIdle) return;
+                
+                self.loadingView.alpha = 1.0;
+                [self.loadingView stopAnimating];
+                
+                self.arrowView.hidden = NO;
+            }];
+        } else {
+            self.arrowView.hidden = NO;
+            [self.loadingView stopAnimating];
+            [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+                self.arrowView.transform = CGAffineTransformMakeRotation(0.000001 - M_PI);
+            }];
+        }
+    } else if (state == MJRefreshStatePulling) {
+        self.arrowView.hidden = NO;
+        [self.loadingView stopAnimating];
+        [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+            self.arrowView.transform = CGAffineTransformIdentity;
+        }];
+    } else if (state == MJRefreshStateRefreshing) {
+        self.arrowView.hidden = YES;
+        [self.loadingView startAnimating];
+    } else if (state == MJRefreshStateNoMoreData) {
+        self.arrowView.hidden = YES;
+        [self.loadingView stopAnimating];
+    }
+}
+
+@end

Pods/MJRefresh/MJRefresh/Custom/Footer/Back/MJRefreshBackStateFooter.h

@@ -0,0 +1,29 @@
+//
+//  MJRefreshBackStateFooter.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/6/13.
+//  Copyright © 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshBackFooter.h>)
+#import <MJRefresh/MJRefreshBackFooter.h>
+#else
+#import "MJRefreshBackFooter.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshBackStateFooter : MJRefreshBackFooter
+/** 文字距离圈圈、箭头的距离 */
+@property (assign, nonatomic) CGFloat labelLeftInset;
+/** 显示刷新状态的label */
+@property (weak, nonatomic, readonly) UILabel *stateLabel;
+/** 设置state状态下的文字 */
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state;
+
+/** 获取state状态下的title */
+- (NSString *)titleForState:(MJRefreshState)state;
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Footer/Back/MJRefreshBackStateFooter.m

@@ -0,0 +1,93 @@
+//
+//  MJRefreshBackStateFooter.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/6/13.
+//  Copyright © 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshBackStateFooter.h"
+#import "NSBundle+MJRefresh.h"
+
+@interface MJRefreshBackStateFooter()
+{
+    /** 显示刷新状态的label */
+    __unsafe_unretained UILabel *_stateLabel;
+}
+/** 所有状态对应的文字 */
+@property (strong, nonatomic) NSMutableDictionary *stateTitles;
+@end
+
+@implementation MJRefreshBackStateFooter
+#pragma mark - 懒加载
+- (NSMutableDictionary *)stateTitles
+{
+    if (!_stateTitles) {
+        self.stateTitles = [NSMutableDictionary dictionary];
+    }
+    return _stateTitles;
+}
+
+- (UILabel *)stateLabel
+{
+    if (!_stateLabel) {
+        [self addSubview:_stateLabel = [UILabel mj_label]];
+    }
+    return _stateLabel;
+}
+
+#pragma mark - 公共方法
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state
+{
+    if (title == nil) return self;
+    self.stateTitles[@(state)] = title;
+    self.stateLabel.text = self.stateTitles[@(self.state)];
+    return self;
+}
+
+- (NSString *)titleForState:(MJRefreshState)state {
+  return self.stateTitles[@(state)];
+}
+
+- (void)textConfiguration {
+    // 初始化文字
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshBackFooterIdleText] forState:MJRefreshStateIdle];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshBackFooterPullingText] forState:MJRefreshStatePulling];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshBackFooterRefreshingText] forState:MJRefreshStateRefreshing];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshBackFooterNoMoreDataText] forState:MJRefreshStateNoMoreData];
+}
+
+#pragma mark - 重写父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+    // 初始化间距
+    self.labelLeftInset = MJRefreshLabelLeftInset;
+    [self textConfiguration];
+}
+
+- (void)i18nDidChange {
+    [self textConfiguration];
+    
+    [super i18nDidChange];
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.stateLabel.constraints.count) return;
+    
+    // 状态标签
+    self.stateLabel.frame = self.bounds;
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 设置状态文字
+    self.stateLabel.text = self.stateTitles[@(state)];
+}
+@end

Pods/MJRefresh/MJRefresh/Custom/Header/MJRefreshGifHeader.h

@@ -0,0 +1,25 @@
+//
+//  MJRefreshGifHeader.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshStateHeader.h>)
+#import <MJRefresh/MJRefreshStateHeader.h>
+#else
+#import "MJRefreshStateHeader.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshGifHeader : MJRefreshStateHeader
+@property (weak, nonatomic, readonly) UIImageView *gifView;
+
+/** 设置state状态下的动画图片images 动画持续时间duration*/
+- (instancetype)setImages:(NSArray *)images duration:(NSTimeInterval)duration forState:(MJRefreshState)state;
+- (instancetype)setImages:(NSArray *)images forState:(MJRefreshState)state;
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Header/MJRefreshGifHeader.m

@@ -0,0 +1,135 @@
+//
+//  MJRefreshGifHeader.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshGifHeader.h"
+#import "UIView+MJExtension.h"
+#import "UIScrollView+MJExtension.h"
+
+@interface MJRefreshGifHeader()
+{
+    __unsafe_unretained UIImageView *_gifView;
+}
+/** 所有状态对应的动画图片 */
+@property (strong, nonatomic) NSMutableDictionary *stateImages;
+/** 所有状态对应的动画时间 */
+@property (strong, nonatomic) NSMutableDictionary *stateDurations;
+@end
+
+@implementation MJRefreshGifHeader
+#pragma mark - 懒加载
+- (UIImageView *)gifView
+{
+    if (!_gifView) { 
+        UIImageView *gifView = [[UIImageView alloc] init]; 
+        [self addSubview:_gifView = gifView]; 
+    } 
+    return _gifView; 
+}
+
+- (NSMutableDictionary *)stateImages 
+{ 
+    if (!_stateImages) { 
+        self.stateImages = [NSMutableDictionary dictionary]; 
+    } 
+    return _stateImages; 
+}
+
+- (NSMutableDictionary *)stateDurations 
+{ 
+    if (!_stateDurations) { 
+        self.stateDurations = [NSMutableDictionary dictionary]; 
+    } 
+    return _stateDurations; 
+}
+
+#pragma mark - 公共方法
+- (instancetype)setImages:(NSArray *)images duration:(NSTimeInterval)duration forState:(MJRefreshState)state {
+    if (images == nil) return self;
+    
+    self.stateImages[@(state)] = images;
+    self.stateDurations[@(state)] = @(duration);
+    
+    /* 根据图片设置控件的高度 */ 
+    UIImage *image = [images firstObject];
+    if (image.size.height > self.mj_h) {
+        self.mj_h = image.size.height;
+    }
+    return self;
+}
+
+- (instancetype)setImages:(NSArray *)images forState:(MJRefreshState)state 
+{ 
+    return [self setImages:images duration:images.count * 0.1 forState:state];
+}
+
+#pragma mark - 实现父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+    // 初始化间距
+    self.labelLeftInset = 20;
+}
+
+- (void)setPullingPercent:(CGFloat)pullingPercent
+{
+    [super setPullingPercent:pullingPercent];
+    NSArray *images = self.stateImages[@(MJRefreshStateIdle)];
+    if (self.state != MJRefreshStateIdle || images.count == 0) return;
+    // 停止动画
+    [self.gifView stopAnimating];
+    // 设置当前需要显示的图片
+    NSUInteger index =  images.count * pullingPercent;
+    if (index >= images.count) index = images.count - 1;
+    self.gifView.image = images[index];
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.gifView.constraints.count) return;
+    
+    self.gifView.frame = self.bounds;
+    if (self.stateLabel.hidden && self.lastUpdatedTimeLabel.hidden) {
+        self.gifView.contentMode = UIViewContentModeCenter;
+    } else {
+        self.gifView.contentMode = UIViewContentModeRight;
+        
+        CGFloat stateWidth = self.stateLabel.mj_textWidth;
+        CGFloat timeWidth = 0.0;
+        if (!self.lastUpdatedTimeLabel.hidden) {
+            timeWidth = self.lastUpdatedTimeLabel.mj_textWidth;
+        }
+        CGFloat textWidth = MAX(stateWidth, timeWidth);
+        self.gifView.mj_w = self.mj_w * 0.5 - textWidth * 0.5 - self.labelLeftInset;
+    }
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 根据状态做事情
+    if (state == MJRefreshStatePulling || state == MJRefreshStateRefreshing) {
+        NSArray *images = self.stateImages[@(state)];
+        if (images.count == 0) return;
+        
+        [self.gifView stopAnimating];
+        if (images.count == 1) { // 单张图片
+            self.gifView.image = [images lastObject];
+        } else { // 多张图片
+            self.gifView.animationImages = images;
+            self.gifView.animationDuration = [self.stateDurations[@(state)] doubleValue];
+            [self.gifView startAnimating];
+        }
+    } else if (state == MJRefreshStateIdle) {
+        [self.gifView stopAnimating];
+    }
+}
+@end

Pods/MJRefresh/MJRefresh/Custom/Header/MJRefreshNormalHeader.h

@@ -0,0 +1,26 @@
+//
+//  MJRefreshNormalHeader.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshStateHeader.h>)
+#import <MJRefresh/MJRefreshStateHeader.h>
+#else
+#import "MJRefreshStateHeader.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshNormalHeader : MJRefreshStateHeader
+@property (weak, nonatomic, readonly) UIImageView *arrowView;
+@property (weak, nonatomic, readonly) UIActivityIndicatorView *loadingView;
+
+
+/** 菊花的样式 */
+@property (assign, nonatomic) UIActivityIndicatorViewStyle activityIndicatorViewStyle MJRefreshDeprecated("first deprecated in 3.2.2 - Use `loadingView` property");
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Header/MJRefreshNormalHeader.m

@@ -0,0 +1,137 @@
+//
+//  MJRefreshNormalHeader.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshNormalHeader.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIScrollView+MJRefresh.h"
+#import "UIView+MJExtension.h"
+
+@interface MJRefreshNormalHeader()
+{
+    __unsafe_unretained UIImageView *_arrowView;
+}
+@property (weak, nonatomic) UIActivityIndicatorView *loadingView;
+@end
+
+@implementation MJRefreshNormalHeader
+#pragma mark - 懒加载子控件
+- (UIImageView *)arrowView
+{
+    if (!_arrowView) {
+        UIImageView *arrowView = [[UIImageView alloc] initWithImage:[NSBundle mj_arrowImage]];
+        [self addSubview:_arrowView = arrowView];
+    }
+    return _arrowView;
+}
+
+- (UIActivityIndicatorView *)loadingView
+{
+    if (!_loadingView) {
+        UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:_activityIndicatorViewStyle];
+        loadingView.hidesWhenStopped = YES;
+        [self addSubview:_loadingView = loadingView];
+    }
+    return _loadingView;
+}
+
+#pragma mark - 公共方法
+- (void)setActivityIndicatorViewStyle:(UIActivityIndicatorViewStyle)activityIndicatorViewStyle
+{
+    _activityIndicatorViewStyle = activityIndicatorViewStyle;
+    
+    [self.loadingView removeFromSuperview];
+    self.loadingView = nil;
+    [self setNeedsLayout];
+}
+
+#pragma mark - 重写父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
+    if (@available(iOS 13.0, *)) {
+        _activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
+        return;
+    }
+#endif
+    
+    _activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    // 箭头的中心点
+    CGFloat arrowCenterX = self.mj_w * 0.5;
+    if (!self.stateLabel.hidden) {
+        CGFloat stateWidth = self.stateLabel.mj_textWidth;
+        CGFloat timeWidth = 0.0;
+        if (!self.lastUpdatedTimeLabel.hidden) {
+            timeWidth = self.lastUpdatedTimeLabel.mj_textWidth;
+        }
+        CGFloat textWidth = MAX(stateWidth, timeWidth);
+        arrowCenterX -= textWidth / 2 + self.labelLeftInset;
+    }
+    CGFloat arrowCenterY = self.mj_h * 0.5;
+    CGPoint arrowCenter = CGPointMake(arrowCenterX, arrowCenterY);
+    
+    // 箭头
+    if (self.arrowView.constraints.count == 0) {
+        self.arrowView.mj_size = self.arrowView.image.size;
+        self.arrowView.center = arrowCenter;
+    }
+        
+    // 圈圈
+    if (self.loadingView.constraints.count == 0) {
+        self.loadingView.center = arrowCenter;
+    }
+    
+    self.arrowView.tintColor = self.stateLabel.textColor;
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 根据状态做事情
+    if (state == MJRefreshStateIdle) {
+        if (oldState == MJRefreshStateRefreshing) {
+            self.arrowView.transform = CGAffineTransformIdentity;
+            
+            [UIView animateWithDuration:self.slowAnimationDuration animations:^{
+                self.loadingView.alpha = 0.0;
+            } completion:^(BOOL finished) {
+                // 如果执行完动画发现不是idle状态，就直接返回，进入其他状态
+                if (self.state != MJRefreshStateIdle) return;
+                
+                self.loadingView.alpha = 1.0;
+                [self.loadingView stopAnimating];
+                self.arrowView.hidden = NO;
+            }];
+        } else {
+            [self.loadingView stopAnimating];
+            self.arrowView.hidden = NO;
+            [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+                self.arrowView.transform = CGAffineTransformIdentity;
+            }];
+        }
+    } else if (state == MJRefreshStatePulling) {
+        [self.loadingView stopAnimating];
+        self.arrowView.hidden = NO;
+        [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+            self.arrowView.transform = CGAffineTransformMakeRotation(0.000001 - M_PI);
+        }];
+    } else if (state == MJRefreshStateRefreshing) {
+        self.loadingView.alpha = 1.0; // 防止refreshing -> idle的动画完毕动作没有被执行
+        [self.loadingView startAnimating];
+        self.arrowView.hidden = YES;
+    }
+}
+@end

Pods/MJRefresh/MJRefresh/Custom/Header/MJRefreshStateHeader.h

@@ -0,0 +1,39 @@
+//
+//  MJRefreshStateHeader.h
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshHeader.h>)
+#import <MJRefresh/MJRefreshHeader.h>
+#else
+#import "MJRefreshHeader.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshStateHeader : MJRefreshHeader
+#pragma mark - 刷新时间相关
+/** 利用这个block来决定显示的更新时间文字 */
+@property (copy, nonatomic, nullable) NSString *(^lastUpdatedTimeText)(NSDate * _Nullable lastUpdatedTime);
+/** 显示上一次刷新时间的label */
+@property (weak, nonatomic, readonly) UILabel *lastUpdatedTimeLabel;
+
+#pragma mark - 状态相关
+/** 文字距离圈圈、箭头的距离 */
+@property (assign, nonatomic) CGFloat labelLeftInset;
+/** 显示刷新状态的label */
+@property (weak, nonatomic, readonly) UILabel *stateLabel;
+/** 设置state状态下的文字 */
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state;
+@end
+
+@interface MJRefreshStateHeader (ChainingGrammar)
+
+- (instancetype)modifyLastUpdatedTimeText:(NSString * (^)(NSDate * _Nullable lastUpdatedTime))handler;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Header/MJRefreshStateHeader.m

@@ -0,0 +1,191 @@
+//
+//  MJRefreshStateHeader.m
+//  MJRefresh
+//
+//  Created by MJ Lee on 15/4/24.
+//  Copyright (c) 2015年 小码哥. All rights reserved.
+//
+
+#import "MJRefreshStateHeader.h"
+#import "MJRefreshConst.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+#import "UIScrollView+MJExtension.h"
+
+@interface MJRefreshStateHeader()
+{
+    /** 显示上一次刷新时间的label */
+    __unsafe_unretained UILabel *_lastUpdatedTimeLabel;
+    /** 显示刷新状态的label */
+    __unsafe_unretained UILabel *_stateLabel;
+}
+/** 所有状态对应的文字 */
+@property (strong, nonatomic) NSMutableDictionary *stateTitles;
+@end
+
+@implementation MJRefreshStateHeader
+#pragma mark - 懒加载
+- (NSMutableDictionary *)stateTitles
+{
+    if (!_stateTitles) {
+        self.stateTitles = [NSMutableDictionary dictionary];
+    }
+    return _stateTitles;
+}
+
+- (UILabel *)stateLabel
+{
+    if (!_stateLabel) {
+        [self addSubview:_stateLabel = [UILabel mj_label]];
+    }
+    return _stateLabel;
+}
+
+- (UILabel *)lastUpdatedTimeLabel
+{
+    if (!_lastUpdatedTimeLabel) {
+        [self addSubview:_lastUpdatedTimeLabel = [UILabel mj_label]];
+    }
+    return _lastUpdatedTimeLabel;
+}
+
+- (void)setLastUpdatedTimeText:(NSString * _Nonnull (^)(NSDate * _Nullable))lastUpdatedTimeText{
+    _lastUpdatedTimeText = lastUpdatedTimeText;
+    // 重新设置key（重新显示时间）
+    self.lastUpdatedTimeKey = self.lastUpdatedTimeKey;
+}
+
+#pragma mark - 公共方法
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state
+{
+    if (title == nil) return self;
+    self.stateTitles[@(state)] = title;
+    self.stateLabel.text = self.stateTitles[@(self.state)];
+    return self;
+}
+
+#pragma mark key的处理
+- (void)setLastUpdatedTimeKey:(NSString *)lastUpdatedTimeKey
+{
+    [super setLastUpdatedTimeKey:lastUpdatedTimeKey];
+    
+    // 如果label隐藏了，就不用再处理
+    if (self.lastUpdatedTimeLabel.hidden) return;
+    
+    NSDate *lastUpdatedTime = [[NSUserDefaults standardUserDefaults] objectForKey:lastUpdatedTimeKey];
+    
+    // 如果有block
+    if (self.lastUpdatedTimeText) {
+        self.lastUpdatedTimeLabel.text = self.lastUpdatedTimeText(lastUpdatedTime);
+        return;
+    }
+    
+    if (lastUpdatedTime) {
+        // 1.获得年月日
+        NSCalendar *calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
+        NSUInteger unitFlags = NSCalendarUnitYear| NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute;
+        NSDateComponents *cmp1 = [calendar components:unitFlags fromDate:lastUpdatedTime];
+        NSDateComponents *cmp2 = [calendar components:unitFlags fromDate:[NSDate date]];
+        
+        // 2.格式化日期
+        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
+        BOOL isToday = NO;
+        if ([cmp1 day] == [cmp2 day]) { // 今天
+            formatter.dateFormat = @" HH:mm";
+            isToday = YES;
+        } else if ([cmp1 year] == [cmp2 year]) { // 今年
+            formatter.dateFormat = @"MM-dd HH:mm";
+        } else {
+            formatter.dateFormat = @"yyyy-MM-dd HH:mm";
+        }
+        NSString *time = [formatter stringFromDate:lastUpdatedTime];
+        
+        // 3.显示日期
+        self.lastUpdatedTimeLabel.text = [NSString stringWithFormat:@"%@%@%@",
+                                          [NSBundle mj_localizedStringForKey:MJRefreshHeaderLastTimeText],
+                                          isToday ? [NSBundle mj_localizedStringForKey:MJRefreshHeaderDateTodayText] : @"",
+                                          time];
+    } else {
+        self.lastUpdatedTimeLabel.text = [NSString stringWithFormat:@"%@%@",
+                                          [NSBundle mj_localizedStringForKey:MJRefreshHeaderLastTimeText],
+                                          [NSBundle mj_localizedStringForKey:MJRefreshHeaderNoneLastDateText]];
+    }
+}
+
+
+- (void)textConfiguration {
+    // 初始化文字
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshHeaderIdleText] forState:MJRefreshStateIdle];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshHeaderPullingText] forState:MJRefreshStatePulling];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshHeaderRefreshingText] forState:MJRefreshStateRefreshing];
+    self.lastUpdatedTimeKey = MJRefreshHeaderLastUpdatedTimeKey;
+}
+
+#pragma mark - 覆盖父类的方法
+- (void)prepare
+{
+    [super prepare];
+    
+    // 初始化间距
+    self.labelLeftInset = MJRefreshLabelLeftInset;
+    [self textConfiguration];
+}
+
+- (void)i18nDidChange {
+    [self textConfiguration];
+    
+    [super i18nDidChange];
+}
+
+- (void)placeSubviews
+{
+    [super placeSubviews];
+    
+    if (self.stateLabel.hidden) return;
+    
+    BOOL noConstrainsOnStatusLabel = self.stateLabel.constraints.count == 0;
+    
+    if (self.lastUpdatedTimeLabel.hidden) {
+        // 状态
+        if (noConstrainsOnStatusLabel) self.stateLabel.frame = self.bounds;
+    } else {
+        CGFloat stateLabelH = self.mj_h * 0.5;
+        // 状态
+        if (noConstrainsOnStatusLabel) {
+            self.stateLabel.mj_x = 0;
+            self.stateLabel.mj_y = 0;
+            self.stateLabel.mj_w = self.mj_w;
+            self.stateLabel.mj_h = stateLabelH;
+        }
+        
+        // 更新时间
+        if (self.lastUpdatedTimeLabel.constraints.count == 0) {
+            self.lastUpdatedTimeLabel.mj_x = 0;
+            self.lastUpdatedTimeLabel.mj_y = stateLabelH;
+            self.lastUpdatedTimeLabel.mj_w = self.mj_w;
+            self.lastUpdatedTimeLabel.mj_h = self.mj_h - self.lastUpdatedTimeLabel.mj_y;
+        }
+    }
+}
+
+- (void)setState:(MJRefreshState)state
+{
+    MJRefreshCheckState
+    
+    // 设置状态文字
+    self.stateLabel.text = self.stateTitles[@(state)];
+    
+    // 重新设置key（重新显示时间）
+    self.lastUpdatedTimeKey = self.lastUpdatedTimeKey;
+}
+@end
+
+#pragma mark - <<< 为 Swift 扩展链式语法 >>> -
+@implementation MJRefreshStateHeader (ChainingGrammar)
+
+- (instancetype)modifyLastUpdatedTimeText:(NSString * _Nonnull (^)(NSDate * _Nullable))handler {
+    self.lastUpdatedTimeText = handler;
+    return self;
+}
+
+@end

Pods/MJRefresh/MJRefresh/Custom/Trailer/MJRefreshNormalTrailer.h

@@ -0,0 +1,23 @@
+//
+//  MJRefreshNormalTrailer.h
+//  MJRefresh
+//
+//  Created by kinarobin on 2020/5/3.
+//  Copyright © 2020 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshStateTrailer.h>)
+#import <MJRefresh/MJRefreshStateTrailer.h>
+#else
+#import "MJRefreshStateTrailer.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MJRefreshNormalTrailer : MJRefreshStateTrailer
+
+@property (weak, nonatomic, readonly) UIImageView *arrowView;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Trailer/MJRefreshNormalTrailer.m

@@ -0,0 +1,80 @@
+//
+//  MJRefreshNormalTrailer.m
+//  MJRefresh
+//
+//  Created by kinarobin on 2020/5/3.
+//  Copyright © 2020 小码哥. All rights reserved.
+//
+
+#import "MJRefreshNormalTrailer.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+
+@interface MJRefreshNormalTrailer() {
+    __unsafe_unretained UIImageView *_arrowView;
+}
+@end
+
+@implementation MJRefreshNormalTrailer
+#pragma mark - 懒加载子控件
+- (UIImageView *)arrowView {
+    if (!_arrowView) {
+        UIImageView *arrowView = [[UIImageView alloc] initWithImage:[NSBundle mj_trailArrowImage]];
+        [self addSubview:_arrowView = arrowView];
+    }
+    return _arrowView;
+}
+
+- (void)placeSubviews {
+    [super placeSubviews];
+
+    CGSize arrowSize = self.arrowView.image.size;
+    // 箭头的中心点
+    CGPoint selfCenter = CGPointMake(self.mj_w * 0.5, self.mj_h * 0.5);
+    CGPoint arrowCenter = CGPointMake(arrowSize.width * 0.5 + 5, self.mj_h * 0.5);
+    BOOL stateHidden = self.stateLabel.isHidden;
+    
+    if (self.arrowView.constraints.count == 0) {
+        self.arrowView.mj_size = self.arrowView.image.size;
+        self.arrowView.center = stateHidden ?  selfCenter : arrowCenter ;
+    }
+    self.arrowView.tintColor = self.stateLabel.textColor;
+    
+    if (stateHidden) return;
+    
+    BOOL noConstrainsOnStatusLabel = self.stateLabel.constraints.count == 0;
+    CGFloat stateLabelW = ceil(self.stateLabel.font.pointSize);
+    // 状态
+    if (noConstrainsOnStatusLabel) {
+        BOOL arrowHidden = self.arrowView.isHidden;
+        CGFloat stateCenterX = (self.mj_w + arrowSize.width) * 0.5;
+        self.stateLabel.center = arrowHidden ? selfCenter : CGPointMake(stateCenterX, self.mj_h * 0.5);
+        self.stateLabel.mj_size = CGSizeMake(stateLabelW, self.mj_h) ;
+    }
+}
+
+- (void)setState:(MJRefreshState)state {
+    MJRefreshCheckState
+    // 根据状态做事情
+    if (state == MJRefreshStateIdle) {
+        if (oldState == MJRefreshStateRefreshing) {
+            [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+                self.arrowView.transform = CGAffineTransformMakeRotation(M_PI);
+            } completion:^(BOOL finished) {
+                self.arrowView.transform = CGAffineTransformIdentity;
+            }];
+        } else {
+            [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+                self.arrowView.transform = CGAffineTransformIdentity;
+            }];
+        }
+    } else if (state == MJRefreshStatePulling) {
+        [UIView animateWithDuration:self.fastAnimationDuration animations:^{
+            self.arrowView.transform = CGAffineTransformMakeRotation(M_PI);
+        }];
+    }
+}
+
+
+
+@end

Pods/MJRefresh/MJRefresh/Custom/Trailer/MJRefreshStateTrailer.h

@@ -0,0 +1,28 @@
+//
+//  MJRefreshStateTrailer.h
+//  MJRefresh
+//
+//  Created by kinarobin on 2020/5/3.
+//  Copyright © 2020 小码哥. All rights reserved.
+//
+
+#if __has_include(<MJRefresh/MJRefreshTrailer.h>)
+#import <MJRefresh/MJRefreshTrailer.h>
+#else
+#import "MJRefreshTrailer.h"
+#endif
+
+NS_ASSUME_NONNULL_BEGIN
+
+
+@interface MJRefreshStateTrailer : MJRefreshTrailer
+
+#pragma mark - 状态相关
+/** 显示刷新状态的label */
+@property (weak, nonatomic, readonly) UILabel *stateLabel;
+/** 设置state状态下的文字 */
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state;
+
+@end
+
+NS_ASSUME_NONNULL_END

Pods/MJRefresh/MJRefresh/Custom/Trailer/MJRefreshStateTrailer.m

@@ -0,0 +1,87 @@
+//
+//  MJRefreshStateTrailer.m
+//  MJRefresh
+//
+//  Created by kinarobin on 2020/5/3.
+//  Copyright © 2020 小码哥. All rights reserved.
+//
+
+#import "MJRefreshStateTrailer.h"
+#import "NSBundle+MJRefresh.h"
+#import "UIView+MJExtension.h"
+
+@interface MJRefreshStateTrailer() {
+    /** 显示刷新状态的label */
+    __unsafe_unretained UILabel *_stateLabel;
+}
+/** 所有状态对应的文字 */
+@property (strong, nonatomic) NSMutableDictionary *stateTitles;
+@end
+
+@implementation MJRefreshStateTrailer
+#pragma mark - 懒加载
+- (NSMutableDictionary *)stateTitles {
+    if (!_stateTitles) {
+        self.stateTitles = [NSMutableDictionary dictionary];
+    }
+    return _stateTitles;
+}
+
+- (UILabel *)stateLabel {
+    if (!_stateLabel) {
+        UILabel *stateLabel = [UILabel mj_label];
+        stateLabel.numberOfLines = 0;
+        [self addSubview:_stateLabel = stateLabel];
+    }
+    return _stateLabel;
+}
+
+#pragma mark - 公共方法
+- (instancetype)setTitle:(NSString *)title forState:(MJRefreshState)state {
+    if (title == nil) return self;
+    self.stateTitles[@(state)] = title;
+    self.stateLabel.text = self.stateTitles[@(self.state)];
+    return self;
+}
+
+- (void)textConfiguration {
+    // 初始化文字
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshTrailerIdleText] forState:MJRefreshStateIdle];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshTrailerPullingText] forState:MJRefreshStatePulling];
+    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshTrailerPullingText] forState:MJRefreshStateRefreshing];
+}
+
+#pragma mark - 覆盖父类的方法
+- (void)prepare {
+    [super prepare];
+    
+    [self textConfiguration];
+}
+
+- (void)i18nDidChange {
+    [self textConfiguration];
+    
+    [super i18nDidChange];
+}
+
+- (void)setState:(MJRefreshState)state {
+    MJRefreshCheckState
+    // 设置状态文字
+    self.stateLabel.text = self.stateTitles[@(state)];
+}
+
+- (void)placeSubviews {
+    [super placeSubviews];
+    
+    if (self.stateLabel.hidden) return;
+    
+    BOOL noConstrainsOnStatusLabel = self.stateLabel.constraints.count == 0;
+    CGFloat stateLabelW = ceil(self.stateLabel.font.pointSize);
+    // 状态
+    if (noConstrainsOnStatusLabel) {
+        self.stateLabel.center = CGPointMake(self.mj_w * 0.5, self.mj_h * 0.5);
+        self.stateLabel.mj_size = CGSizeMake(stateLabelW, self.mj_h) ;
+    }
+}
+
+@end