0128——手势Gesture

UIGestureRecognizer:

1.locationinView 获取手势在某个视图里面的坐标位置

2.delegate监听手势的行为

3.state状态

　　开始：UIGestureRecognizerStateBegan  手势达到要求

　　识别：UIGestureRecognizerStateRecognized  手势识别的最后一刻

　　改变：UIGestureRecognizerStateChanged  手势过程当中

　　结束：UIGestureRecognizerStateEnded  手势结束

　　取消：UIGestureRecognizerStateCancelled

　　失败：UIGestureRecognizerStateFailed

1.单击

UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(handleSingleFingerEvent:)];

singleFingerOne.numberOfTouchesRequired = 1; 手指数

singleFingerOne.numberOfTapsRequired = 1; tap次数

2.长按

UILongPressGestureRecognizer *longpressGesutre=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongpressGesture:)];

longpressGesutre.minimumPressDuration=1;  最少长按时间

longpressGesutre.allowableMovement=15; 最大15像素的运动是手势识别所允许的

3.滑动

UISwipeGestureRecognizer *swipeGesture=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeGesture:)];

swipeGesture.direction=UISwipeGestureRecognizerDirectionLeft; 不设置是右  多个方向用|或

4.捏

UIPinchGestureRecognizer *pinchGesture=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(PinchGesture:)];

-(void) pinchGesture:(id)sender{

     UIPinchGestureRecognizer *gesture = sender;     

    //手势改变时

    if (gesture.state == UIGestureRecognizerStateChanged){

        //捏合手势中scale属性记录的缩放比例

        _imageView.transform = CGAffineTransformScale(_imageView.transform，gesture.scale, gesture.scale);

    }    

    //结束后恢复

    if(gesture.state==UIGestureRecognizerStateEnded){

        [UIView animateWithDuration:0.5 animations:^{

            _imageView.transform = CGAffineTransformIdentity;//取消一切形变

        }];

    }

}

5.旋转

UIRotateGestureRecognizer *rotateGesture=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(rotationGesture:)]; 

-(void)rotationGesture:(id)sender{    

　　UIRotateGestureRecognizer *gesture = sender;      

　　if (gesture.state==UIGestureRecognizerStateChanged){        

　　　　_imageView.transform=CGAffineTransform=Rotation(_imageView.transform,gesture.rotation);    

　　}       

　　if(gesture.state==UIGestureRecognizerStateEnded){        

　　　　[UIView animateWithDuration:1 animations:^{            

　　　　　　_imageView.transform=CGAffineTransformIdentity;//取消形变   

      }];   

 　 }   

 }

6.多手势

ios开发中，默认是在同一时间只能有一个手势被执行，要实现多个手势同时进行，须实现UIGestureRecognizerDelegate，并重写函数

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

return YES；

}