六种手势

1.手势分类

• UITapGestureRecognizer(敲击)
• 设置numberOfTapsRequired点击的次数
• 结合代理(BOOL) gestureRecognizer可以选定可点击的区域
• UIPinchGestureRecognizer(捏合，用于缩放)
• 注意复位问题
• UIPanGestureRecognizer(拖拽)
• UISwipeGestureRecognizer(轻扫)
• UIRotationGestureRecognizer(旋转)
• UILongPressGestureRecognizer(长按)
  • 长按的两次响应问题的解决

2.对每一个手势的注意点及代码实现进行说明

• UITapGestureRecognizer(敲击)

  #pragma mark - tap敲击/** *  1.numberOfTapsRequired设置点击几次响应 *  2.代理与(BOOL) gestureRecognizer结合，可确定图片哪个区域可以点，哪些不能点 */-(void) setTap{    //创建点按手势    //initWithTarget:谁监听这个事件呢，一般控制器    UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];    //delegate    tap.delegate=self;    //click counts    tap.numberOfTapsRequired=2;    //添加手势，用的是多态addGestureRecognizer:(UIGestureRecognizer*)gestureRecognizer（父类）    [self.imageView addGestureRecognizer:tap];}-(void) tap:(UITapGestureRecognizer *) tap{    NSLog(@"%s",__func__);}

#pragma mark - UIGestureRecognizerDelegate //与tap结合 -(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch )touch{ //获取当前触摸点在self.imageView的哪个位置 CGPoint curP=[touch locationInView:self.imageView]; if (curP.x<self.imageView.bounds.size.width0.5) { return YES; }else{ return NO; } }

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• UIPinchGestureRecognizer(捏合，用于缩放)

#pragma mark - pinch捏合，用于缩放 -(void) setPinch{ UIPinchGestureRecognizer *pinch=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinch:)]; pinch.delegate=self; [self.imageView addGestureRecognizer:pinch]; } -(void) pinch:(UIPinchGestureRecognizer *) pinch{ NSLog(@"%s",func); self.imageView.transform=CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale); pinch.scale=1; } ```

• UIPanGestureRecognizer(拖拽)

  #pragma mark - pan拖拽/** *  复位是指返回到起始的状态，再能过相对上一个状态tansform来解决一些问题 */-(void) setPan{    UIPanGestureRecognizer *pan=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];    [self.imageView addGestureRecognizer:pan];}-(void) pan:(UIPanGestureRecognizer *) pan{    NSLog(@"%s",__func__);//    CGPoint curP=[pan locationInView:self.imageView];    //获取图片移动距离    CGPoint curP=[pan translationInView:self.imageView];    self.imageView.transform=CGAffineTransformTranslate(self.imageView.transform, curP.x, curP.y);    //复位    [pan setTranslation:CGPointZero inView:self.imageView];}

• UISwipeGestureRecognizer(轻扫)

  #pragma mark - swipe轻扫-(void) setSwipe{    //添加向左滑动    UISwipeGestureRecognizer *swipe=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];    swipe.direction=UISwipeGestureRecognizerDirectionLeft;    [self.imageView addGestureRecognizer:swipe];    //添加向右滑动    UISwipeGestureRecognizer *swipeDown=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)];    swipeDown.direction=UISwipeGestureRecognizerDirectionRight;    [self.imageView addGestureRecognizer:swipeDown];}-(void) swipe:(UISwipeGestureRecognizer *)swipe{    NSLog(@"%s",__func__);}

• UIRotationGestureRecognizer(旋转)

  #pragma mark - rotation旋转-(void) setRotation{    UIRotationGestureRecognizer *rotation=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotation:)];    rotation.delegate=self;    [self.imageView addGestureRecognizer:rotation];}-(void) rotation:(UIRotationGestureRecognizer *) rotation{    NSLog(@"%s",__func__);    NSLog(@"%f",rotation.rotation);    self.imageView.transform=CGAffineTransformRotate(self.imageView.transform, rotation.rotation);    [rotation setRotation:0];//    rotation.rotation=0;}

• UILongPressGestureRecognizer(长按)

  #pragma mark - longPress长按-(void) setLongPress{    UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];    [self.imageView addGestureRecognizer:longPress];}/** *  长按的一些注意点，那就是长按时触发一次，离开时再触发一次 *  加个判断，结束与开始选一个触发的时间 *  @param longPress 传参 */-(void) longPress:(UILongPressGestureRecognizer *) longPress{    if (longPress.state==UIGestureRecognizerStateBegan) {        NSLog(@"%s",__func__);    }}

• 当同时多个手势可以处理时(代理)

/**

• 是否支持多个手势同时处理
• @param gestureRecognizer 。。
• @param otherGestureRecognizer 。。
• @return return value bool */ -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES; }

3.源代码的地址