IOS触摸事件和手势识别
目录
- 概述
- 触摸事件
- 手势识别
概述
为了实现一些新的需求，我们常常需要给IOS添加触摸事件和手势识别
触摸事件
触摸事件的四种方法
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 开始触摸所触发的方法
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 移动时触发的方法
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 离开时触发的方法
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 系统由于某原因取消触摸事件时所调用的方法
获得触摸位置的方法
for(UITouch *t in touches){
CGPoint touchPosition = [t locationInView:self.view];
NSLog(@"%f,%f",touchPosition.x,touchPosition.y);
}
手势识别
手势种类
UITapGestureRecognizer轻触
UISwipeGestureRecognizer很快的滑动
UIPanGestureRecognizer拖动
UIPinchGestureRecognizer两个手指头捏或放
UIRotationGestureRecognizer手指方向操作
UILongPressGestureRecognizer长按
UITapGestureRecognizer轻触
初始化
UITapGestureRecognizer *tapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
[view addGestureRecognizer:tapGR];
常用方法
[self setNumberOfTapsRequired:numbers];
[self setNumberOfTouchesRequired:number2];
其他方法可以参考UIGestureRecognizer文档
UITapGestureRecognizer的响应方法
-(void)tapAction:(UITapGestureRecognizer *)sender{
//Tap拿起的时候
if(tapGR.state == UIGestureRecognizerStateEnded){
}
//Tap按下的时候
if(tapGR.state == UIGestureRecognizerStateBegan){
}
//等等其他状态
}
获得UITapGestureRecognizer按下的位置
CGPoint point = [sender locationInView:view];