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keyBoard/Class/Login/VC/KBLoginSheetViewController.h

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+//
+//  KBLoginSheetViewController.h
+//  keyBoard
+//
+//  A lightweight bottom-sheet style login prompt.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface KBLoginSheetViewController : UIViewController
+
+/// Called when the login finished successfully; sheet will dismiss itself as well.
+@property (nonatomic, copy, nullable) void (^onLoginSuccess)(void);
+
+/// Present the sheet from a top most view controller.
++ (void)presentIfNeededFrom:(UIViewController *)presenting;
+
+@end
+
+NS_ASSUME_NONNULL_END
+

keyBoard/Class/Login/VC/KBLoginSheetViewController.m

@@ -0,0 +1,154 @@
+//
+//  KBLoginSheetViewController.m
+//  keyBoard
+//
+//  Bottom sheet asking user to login with Apple ID. Tapping Continue shows LoginViewController.
+//
+
+#import "KBLoginSheetViewController.h"
+#import "LoginViewController.h"
+#import <Masonry/Masonry.h>
+
+@interface KBLoginSheetViewController ()
+@property (nonatomic, strong) UIControl *backdrop;
+@property (nonatomic, strong) UIView *sheet;
+@property (nonatomic, strong) UIButton *checkButton;
+@property (nonatomic, strong) UILabel *descLabel;
+@property (nonatomic, strong) UIButton *continueButton;
+@end
+
+@implementation KBLoginSheetViewController
+
++ (void)presentIfNeededFrom:(UIViewController *)presenting {
+    if (!presenting) return;
+    // 避免重复弹多个
+    if ([presenting.presentedViewController isKindOfClass:[self class]]) return;
+    KBLoginSheetViewController *vc = [KBLoginSheetViewController new];
+    vc.modalPresentationStyle = UIModalPresentationOverFullScreen;
+    [presenting presentViewController:vc animated:NO completion:nil];
+}
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    self.view.backgroundColor = [UIColor clearColor];
+    [self buildUI];
+}
+
+- (void)buildUI {
+    // 半透明背景，点击可关闭
+    self.backdrop = [[UIControl alloc] init];
+    self.backdrop.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.15];
+    [self.backdrop addTarget:self action:@selector(dismissSelf) forControlEvents:UIControlEventTouchUpInside];
+    [self.view addSubview:self.backdrop];
+    [self.backdrop mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.edges.equalTo(self.view);
+    }];
+
+    // 底部白色卡片
+    self.sheet = [[UIView alloc] init];
+    self.sheet.backgroundColor = [UIColor whiteColor];
+    self.sheet.layer.cornerRadius = 12.0;
+    self.sheet.layer.maskedCorners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner; // 顶部圆角
+    self.sheet.layer.masksToBounds = YES;
+    [self.view addSubview:self.sheet];
+    [self.sheet mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.left.right.equalTo(self.view);
+        make.bottom.equalTo(self.view.mas_safeAreaLayoutGuideBottom);
+        make.height.mas_equalTo(160);
+    }];
+
+    // 复选框 + 文案
+    self.checkButton = [UIButton buttonWithType:UIButtonTypeSystem];
+    self.checkButton.layer.cornerRadius = 16;
+    self.checkButton.layer.borderWidth = 2;
+    self.checkButton.layer.borderColor = [UIColor colorWithWhite:0.8 alpha:1.0].CGColor;
+    self.checkButton.backgroundColor = [UIColor whiteColor];
+    [self.checkButton setTitle:@"" forState:UIControlStateNormal];
+    [self.checkButton addTarget:self action:@selector(toggleCheck) forControlEvents:UIControlEventTouchUpInside];
+
+    self.descLabel = [UILabel new];
+    self.descLabel.text = @"allow log in with apple id?";
+    self.descLabel.textColor = [UIColor blackColor];
+    self.descLabel.font = [UIFont systemFontOfSize:16];
+
+    [self.sheet addSubview:self.checkButton];
+    [self.sheet addSubview:self.descLabel];
+    [self.checkButton mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.left.equalTo(self.sheet).offset(28);
+        make.top.equalTo(self.sheet).offset(18);
+        make.width.height.mas_equalTo(32);
+    }];
+    [self.descLabel mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.left.equalTo(self.checkButton.mas_right).offset(12);
+        make.centerY.equalTo(self.checkButton.mas_centerY);
+        make.right.lessThanOrEqualTo(self.sheet).offset(-20);
+    }];
+
+    // Continue 按钮
+    self.continueButton = [UIButton buttonWithType:UIButtonTypeSystem];
+    self.continueButton.backgroundColor = [UIColor whiteColor];
+    self.continueButton.layer.cornerRadius = 10;
+    self.continueButton.layer.borderWidth = 1.0;
+    self.continueButton.layer.borderColor = [UIColor colorWithWhite:0.8 alpha:1.0].CGColor;
+    [self.continueButton setTitle:@"Continue" forState:UIControlStateNormal];
+    [self.continueButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
+    self.continueButton.titleLabel.font = [UIFont boldSystemFontOfSize:20];
+    [self.continueButton addTarget:self action:@selector(onContinue) forControlEvents:UIControlEventTouchUpInside];
+    [self.sheet addSubview:self.continueButton];
+    [self.continueButton mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.left.equalTo(self.sheet).offset(28);
+        make.right.equalTo(self.sheet).offset(-28);
+        make.height.mas_equalTo(48);
+        make.top.equalTo(self.checkButton.mas_bottom).offset(18);
+    }];
+}
+
+- (void)viewDidAppear:(BOOL)animated {
+    [super viewDidAppear:animated];
+    // 初始位置在屏幕下方，做一个上滑动画
+    CGRect frame = self.sheet.frame;
+    self.sheet.transform = CGAffineTransformMakeTranslation(0, frame.size.height + 40);
+    self.backdrop.alpha = 0;
+    [UIView animateWithDuration:0.22 animations:^{
+        self.sheet.transform = CGAffineTransformIdentity;
+        self.backdrop.alpha = 1;
+    }];
+}
+
+- (void)dismissSelf {
+    [UIView animateWithDuration:0.18 animations:^{
+        self.sheet.transform = CGAffineTransformMakeTranslation(0, self.sheet.bounds.size.height + 40);
+        self.backdrop.alpha = 0;
+    } completion:^(BOOL finished) {
+        [self dismissViewControllerAnimated:NO completion:nil];
+    }];
+}
+
+- (void)toggleCheck {
+    self.checkButton.selected = !self.checkButton.selected;
+    if (self.checkButton.selected) {
+        self.checkButton.backgroundColor = [UIColor colorWithRed:0.22 green:0.49 blue:0.96 alpha:1.0];
+        self.checkButton.layer.borderColor = self.checkButton.backgroundColor.CGColor;
+    } else {
+        self.checkButton.backgroundColor = [UIColor whiteColor];
+        self.checkButton.layer.borderColor = [UIColor colorWithWhite:0.8 alpha:1.0].CGColor;
+    }
+}
+
+- (void)onContinue {
+    // 继续：展示内置的登录页（Apple 登录）
+    LoginViewController *login = [LoginViewController new];
+    __weak typeof(self) weakSelf = self;
+    login.onLoginSuccess = ^(NSDictionary * _Nonnull userInfo) {
+        __strong typeof(weakSelf) self = weakSelf; if (!self) return;
+        // 先关闭登录页，再收起底部弹层
+        [self dismissViewControllerAnimated:YES completion:^{
+            if (self.onLoginSuccess) self.onLoginSuccess();
+            [self dismissSelf];
+        }];
+    };
+    login.modalPresentationStyle = UIModalPresentationPageSheet;
+    [self presentViewController:login animated:YES completion:nil];
+}
+
+@end