Question

如何使用iOS手势UIGestureRecognizer

Answer 1

UIGestureRecognizer是iOS手势基类
主要我们使用下列子类进行开发：
//Tap（点击）
1、UITapGestureRecognizer

//Pinch（捏合）
2、UIPinchGestureRecognizer

//Rotation（旋转）
3、UIRotationGestureRecognizer

//Swipe（滑动，快速移动，是用于监测滑动的方向的）
4、UISwipeGestureRecognizer

//Pan （拖移，慢速移动，是用于监测偏移的量的）
5、UIPanGestureRecognizer

//LongPress（长按）
6、UILongPressGestureRecognizer

给你举个详细的例子：
//<1>单击
UITapGestureRecognizer * single = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(singleAction:)];

//手指数
single.numberOfTouchesRequired = 1;

single.numberOfTapsRequired = 1;

[self.view addGestureRecognizer:single];

//<2>双击

UITapGestureRecognizer * doubleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTapAction:)];

doubleTap.numberOfTouchesRequired = 1;

doubleTap.numberOfTapsRequired = 2;

[self.view addGestureRecognizer:doubleTap];

//<3>三击

UITapGestureRecognizer * third = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(thirdAction:)];

third.numberOfTapsRequired = 3;

third.numberOfTouchesRequired = 1;

[self.view addGestureRecognizer:third];

//为了避免干扰需要设置手势的优先级

[single requireGestureRecognizerToFail:doubleTap];

[doubleTap requireGestureRecognizerToFail:third];