236 lines
8.7 KiB
Objective-C
236 lines
8.7 KiB
Objective-C
//
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// WMDragView.m
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// WMDragView
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//
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// Created by zhengwenming on 2016/12/16.
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//
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//
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#import "WMDragView.h"
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@interface WMDragView ()<UIGestureRecognizerDelegate>
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/**
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内容view，命名为contentViewForDrag，因为很多其他开源的第三方的库，里面同样有contentView这个属性
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，这里特意命名为contentViewForDrag以防止冲突
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*/
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@property (nonatomic,strong) UIView *contentViewForDrag;
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@property (nonatomic,assign) CGPoint startPoint;
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@property (nonatomic,strong) UIPanGestureRecognizer *panGestureRecognizer;
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@property (nonatomic,assign) CGFloat previousScale;
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@end
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@implementation WMDragView
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-(UIImageView *)imageView{
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if (_imageView==nil) {
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_imageView = [[UIImageView alloc]init];
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_imageView.userInteractionEnabled = YES;
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_imageView.clipsToBounds = YES;
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[self.contentViewForDrag addSubview:_imageView];
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}
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return _imageView;
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}
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-(UIButton *)button{
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if (_button==nil) {
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_button = [UIButton buttonWithType:UIButtonTypeCustom];
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_button.clipsToBounds = YES;
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_button.userInteractionEnabled = NO;
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[self.contentViewForDrag addSubview:_button];
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}
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return _button;
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}
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-(UIView *)contentViewForDrag{
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if (_contentViewForDrag==nil) {
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_contentViewForDrag = [[UIView alloc]init];
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_contentViewForDrag.clipsToBounds = YES;
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}
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return _contentViewForDrag;
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}
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- (instancetype)initWithFrame:(CGRect)frame{
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self = [super initWithFrame:frame];
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if (self) {
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[self addSubview:self.contentViewForDrag];
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[self setUp];
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}
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return self;
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}
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- (instancetype)initWithCoder:(NSCoder *)coder{
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self = [super initWithCoder:coder];
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if (self) {
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[self setUp];
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}
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return self;
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}
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-(void)layoutSubviews{
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[super layoutSubviews];
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if (self.freeRect.origin.x!=0||self.freeRect.origin.y!=0||self.freeRect.size.height!=0||self.freeRect.size.width!=0) {
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//设置了freeRect--活动范围
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}else{
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//没有设置freeRect--活动范围，则设置默认的活动范围为父视图的frame
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self.freeRect = (CGRect){CGPointZero,self.superview.bounds.size};
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}
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_imageView.frame = (CGRect){CGPointZero,self.bounds.size};
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_button.frame = (CGRect){CGPointZero,self.bounds.size};
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self.contentViewForDrag.frame = (CGRect){CGPointZero,self.bounds.size};
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}
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-(void)setUp{
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self.dragEnable = YES;//默认可以拖曳
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self.clipsToBounds = YES;
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self.isKeepBounds = NO;
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self.backgroundColor = [UIColor lightGrayColor];
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UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickDragView)];
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[self addGestureRecognizer:singleTap];
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//添加移动手势可以拖动
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self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragAction:)];
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self.panGestureRecognizer.minimumNumberOfTouches = 1;
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self.panGestureRecognizer.maximumNumberOfTouches = 1;
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self.panGestureRecognizer.delegate = self;
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[self addGestureRecognizer:self.panGestureRecognizer];
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}
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- (void)setIsKeepBounds:(BOOL)isKeepBounds{
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_isKeepBounds = isKeepBounds;
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if(isKeepBounds){
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[self keepBounds];
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}
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}
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-(void)setFreeRect:(CGRect)freeRect{
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_freeRect = freeRect;
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[self keepBounds];
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}
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//-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
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// return self.dragEnable;
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//}
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/**
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拖动事件
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@param pan 拖动手势
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*/
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-(void)dragAction:(UIPanGestureRecognizer *)pan{
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if(self.dragEnable==NO)return;
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switch (pan.state) {
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case UIGestureRecognizerStateBegan:{//开始拖动
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if (self.beginDragBlock) {
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self.beginDragBlock(self);
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}
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//注意完成移动后，将translation重置为0十分重要。否则translation每次都会叠加
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[pan setTranslation:CGPointZero inView:self];
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//保存触摸起始点位置
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self.startPoint = [pan translationInView:self];
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break;
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}
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case UIGestureRecognizerStateChanged:{//拖动中
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//计算位移 = 当前位置 - 起始位置
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if (self.duringDragBlock) {
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self.duringDragBlock(self);
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}
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CGPoint point = [pan translationInView:self];
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float dx;
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float dy;
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switch (self.dragDirection) {
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case WMDragDirectionAny:
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dx = point.x - self.startPoint.x;
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dy = point.y - self.startPoint.y;
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break;
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case WMDragDirectionHorizontal:
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dx = point.x - self.startPoint.x;
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dy = 0;
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break;
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case WMDragDirectionVertical:
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dx = 0;
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dy = point.y - self.startPoint.y;
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break;
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default:
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dx = point.x - self.startPoint.x;
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dy = point.y - self.startPoint.y;
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break;
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}
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//计算移动后的view中心点
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CGPoint newCenter = CGPointMake(self.center.x + dx, self.center.y + dy);
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//移动view
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self.center = newCenter;
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// 注意完成上述移动后，将translation重置为0十分重要。否则translation每次都会叠加
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[pan setTranslation:CGPointZero inView:self];
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break;
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}
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case UIGestureRecognizerStateEnded:{//拖动结束
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[self keepBounds];
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if (self.endDragBlock) {
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self.endDragBlock(self);
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}
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break;
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}
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default:
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break;
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}
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}
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//单击事件
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-(void)clickDragView{
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if (self.clickDragViewBlock) {
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self.clickDragViewBlock(self);
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}
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}
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//黏贴边界效果
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- (void)keepBounds{
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//中心点判断
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float centerX = self.freeRect.origin.x+(self.freeRect.size.width - self.frame.size.width)/2;
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CGRect rect = self.frame;
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if (self.isKeepBounds==NO) {//没有设置黏贴边界的效果
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if (self.frame.origin.x < self.freeRect.origin.x) {
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CGContextRef context = UIGraphicsGetCurrentContext();
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[UIView beginAnimations:@"leftMove" context:context];
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[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
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[UIView setAnimationDuration:0.5];
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rect.origin.x = self.freeRect.origin.x;
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self.frame = rect;
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[UIView commitAnimations];
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} else if(self.freeRect.origin.x+self.freeRect.size.width < self.frame.origin.x+self.frame.size.width){
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CGContextRef context = UIGraphicsGetCurrentContext();
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[UIView beginAnimations:@"rightMove" context:context];
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[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
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[UIView setAnimationDuration:0.5];
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rect.origin.x = self.freeRect.origin.x+self.freeRect.size.width-self.frame.size.width;
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self.frame = rect;
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[UIView commitAnimations];
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}
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}else if(self.isKeepBounds==YES){//设置了自动粘边的效果
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if (self.frame.origin.x< centerX) {
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CGContextRef context = UIGraphicsGetCurrentContext();
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[UIView beginAnimations:@"leftMove" context:context];
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[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
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[UIView setAnimationDuration:0.5];
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rect.origin.x = self.freeRect.origin.x;
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self.frame = rect;
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[UIView commitAnimations];
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} else {
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CGContextRef context = UIGraphicsGetCurrentContext();
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[UIView beginAnimations:@"rightMove" context:context];
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[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
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[UIView setAnimationDuration:0.5];
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rect.origin.x =self.freeRect.origin.x+self.freeRect.size.width - self.frame.size.width;
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self.frame = rect;
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[UIView commitAnimations];
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}
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}
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if (self.frame.origin.y < self.freeRect.origin.y) {
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CGContextRef context = UIGraphicsGetCurrentContext();
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[UIView beginAnimations:@"topMove" context:context];
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[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
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[UIView setAnimationDuration:0.5];
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rect.origin.y = self.freeRect.origin.y;
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self.frame = rect;
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[UIView commitAnimations];
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} else if(self.freeRect.origin.y+self.freeRect.size.height< self.frame.origin.y+self.frame.size.height){
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CGContextRef context = UIGraphicsGetCurrentContext();
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[UIView beginAnimations:@"bottomMove" context:context];
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[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
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[UIView setAnimationDuration:0.5];
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rect.origin.y = self.freeRect.origin.y+self.freeRect.size.height-self.frame.size.height;
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self.frame = rect;
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[UIView commitAnimations];
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}
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}
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@end
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