Touch基本

UIviewController可以放入touch事件

UITouch的状态：

//用户刚触摸屏幕时

UITouchPhaseBegin

//表示有触摸在屏幕上移动

UITouchPhaseMoved

//表示触摸仍停留在屏幕表面，不过之前一个事件之后没移动过

UITouchPhaseStationary

//在触摸远离屏幕时被触发

UITouchPhaseEnded

//在IOS系统停止跟踪特定触摸时发生，例如有电话打来

UITouchPhaseCancelled

//touch开始

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;

//touch移动

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;

//touch结束

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;

//touch改变后

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;

获取当前touch

UITouch *touch = [touches anyObject];

获取touch坐标

CGPoint currentPoint = [touch locationInView:self];

开启多点触控

self.multipleTouchEnabled = YES;

手势

//轻击

UITapGestureRecognizer  次数 numberOfTapsRequired

//捏合

UIPinchGestureRecognizer

//扫动

UISwipeGestureRecognizer 滑动方向 direction

//长按

UILongPressGestureRecognizer  按住时间minimumPressDuration

//拖动

UIPanGestureRecognizer

UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)touch;

UIView * view = pan.view;

if (pan.state == UIGestureRecognizerStateBegan || pan.state == UIGestureRecognizerStateChanged)

{

[[selfsuperview] bringSubviewToFront:self];

//获得每次与上次的点的移动距离

CGPoint translation = [pan translationInView:view.superview];

NSLog(@"x坐标%f，y坐标%f",translation.x,translation.y);

[view setCenter:CGPointMake(view.center.x+translation.x, view.center.y + translation.y)];

[pan setTranslation:CGPointZero inView:view.superview];

UIPan