手势UIGestureRecognizer

UIGestureRecognizer抽象类，六大手势是其子类；

• UITapGestureRecognizer 　　     点击
• UIPinchGestureRecognizer         缩放
• UIRotationGestureRecognizer     旋转
• UISwipeGestureRecognizer         轻扫 
• UIPanGestureRecognizer             拖动
• UILongPressGestureRecognizer   长按

typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {//手势当前的状态

    UIGestureRecognizerStatePossible, （默认） 

    UIGestureRecognizerStateBegan,      （开始）

    UIGestureRecognizerStateChanged,（已经改变）  

    UIGestureRecognizerStateEnded,  （结束）   

    UIGestureRecognizerStateCancelled, （取消）

    UIGestureRecognizerStateFailed,  （失败）  

    UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded 

}

一、拖动手势  UIPanGestureRecognizer

　　UIPanGestureRecognizer *panGesture =[[UIPanGestureRecognize alloc]　　initWithTarget:self action:@selection(handlePan:)];

　　[view  addGestureRecognizer:panGesture];

- (void)handlePan:(UIPanGestureRecognizer *)panGesture{
    CGPoint translation = [panGesture translationInView:self.view];
    CGPoint point = CGPointMake(panGesture.view.center.x + translation.x,panGesture.view.center.y + translation.y);
    panGesture.view.center = point;
    [panGesture setTranslation:CGPointZero inView:self.view];
}
　　

1、确保view是可交互的 view.userInteractionEnabled = yes;

2、translationInView (相对点击点的偏移量) locationInView（相对屏幕实时坐标）；

3、setTranslation：CGPointZero inView（每次初始化位置） 和translationInView同时使用；

4、velocityInView （获取速度矢量）　　

二、捏合手势 UIPinchGestureRecognizer

　　UIPinchGestureRecognizer  *phinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget: self action:@selector(handlePinch:)];

　　[view addGestureRecognizer:pinchGesture];

- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer{
    CGFloat scale = recognizer.scale;
    recognizer.view.transform = CGAffineTransformMakeScale(scale, scale);// 每次缩放都回复原来基础下变化
//    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, scale, scale);//在已经缩放大小基础下累加变化
//    recognizer.scale = 1.0;
}

　　scale 缩放倍数 ，velocity 缩放速率；

 三、旋转手势 UIRotationGestureRecognizer

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

　　[view addGestureRecognizer:rotationGesture];

- (void)handleRotation:(UIRotationGestureRecognizer *)recognizer {
    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
    recognizer.rotation = 0.0;
}

四、点击手势 UITapGestureRecognizer

@property (nonatomic) NSUInteger  numberOfTapsRequired;       // 点击次数（默认一次）
@property (nonatomic) NSUInteger  numberOfTouchesRequired __TVOS_PROHIBITED;    // 需要手字数（默认一个点击点）

五、长按手势 UILongPressGestureRecognizer

@property (nonatomic) NSUInteger numberOfTapsRequired;      // Default is 0. The number of full taps required before the press for gesture to be recognized
@property (nonatomic) NSUInteger numberOfTouchesRequired __TVOS_PROHIBITED;   // Default is 1. Number of fingers that must be held down for the gesture to be recognized

@property (nonatomic) CFTimeInterval minimumPressDuration; // Default is 0.5. 最小长按时间
@property (nonatomic) CGFloat allowableMovement;           // Default is 10. 长按时允许移动的距离

 六、轻扫手势 UISwipeGestureRecognizer

typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
    UISwipeGestureRecognizerDirectionRight = 1 << 0, 
    UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
    UISwipeGestureRecognizerDirectionUp    = 1 << 2,
    UISwipeGestureRecognizerDirectionDown  = 1 << 3
};
@property(nonatomic) UISwipeGestureRecognizerDirection direction; //轻扫方向

号外：同时响应多种手势

设置手势delegate实现方法

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}