触摸事件
//*****添加手势,一定要打开用户交互,否则就不会响应
imgv.userInteractionEnabled=YES;
//创建一个点击手势
UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapChangeAction:)];
//把创建的单击手势给图片视图
[imgv addGestureRecognizer:tap];
//创建一个旋转的手势对象
UIRotationGestureRecognizer*rotation=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationChangeAction:)];
//添加手势到imgv
[imgv addGestureRecognizer:rotation];
//创建捏合手势
UIPinchGestureRecognizer *pinch=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchChangeAction:)];
//添加手势
[imgv addGestureRecognizer:pinch];
//创建长按手势
UILongPressGestureRecognizer *longpress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
[imgv addGestureRecognizer:longpress];
//创建扫动手势
UISwipeGestureRecognizer *swipe=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeChangeAction:)];
swipe.direction=UISwipeGestureRecognizerDirectionLeft;
[imgv addGestureRecognizer:swipe];