iOS触摸事件

触摸常见的事件有以下几种，触摸事件一般写在view文件中，因为viewController文件有可能控制不止一个view，不适合写触摸事件

 // 开始触摸
 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
     NSLog(@"开始触摸touch");
 }

 // 触摸结束
 - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
     NSLog(@"触摸结束touch");
 }

 // 移动触摸
 - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
     NSLog(@"移动触摸touch");

     // 1.获取触摸手势
     UITouch *touch = [touches anyObject];

     // 2.获取触摸的位置(获取一个触摸在某个视图上的位置)
     CGPoint currentPoint = [touch locationInView:self.superview];

     // 3.根据触摸的位置改变视图的位置
     self.center = currentPoint;

 }

 // 触摸被打断
 - (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
     NSLog(@"触摸被打断touch");
 }