UIGestureRecognizer - 手势

UIGestureRecognizer 抽象类

    tap.cancelsTouchesInView = NO;
    tap.delaysTouchesBegan = NO;
    tap.delaysTouchesEnded = YES;
    
    tap.delegate = self;// 有多个代理，判断手势的可用性等。


    // 识别手势后，可以获取手势状态等 做相应的处理
    UIGestureRecognizerState state = gesture.state;

    NSUInteger num = [gesture numberOfTouches];
    CGPoint point = [gesture locationInView:self.testView];// 点击位置
    CGPoint point2 = [gesture locationInView:self.view];// 点击位置
    CGPoint point3 = [gesture locationInView:gesture.view];// 点击位置，手势自带view
    
...

UITapGestureRecognizer 点击手势

    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(test:)];
    gesture.numberOfTapsRequired = 1;// 点击次数
    gesture.numberOfTouchesRequired = 1;// 手指数
    [self.testView addGestureRecognizer:gesture];

UILongPressGestureRecognizer 长按

    UILongPressGestureRecognizer *gesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(test:)];
    gesture.numberOfTapsRequired = 0;// 默认要 0 
    gesture.numberOfTouchesRequired = 1;// 手指
    gesture.minimumPressDuration = .5;// 触发时间
    gesture.allowableMovement = 10.;// 触发允许移动范围

UISwipeGestureRecognizer 轻扫

    UISwipeGestureRecognizer *gesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(test:)];
    gesture.numberOfTouchesRequired = 1;// 手指
    gesture.direction = UISwipeGestureRecognizerDirectionRight;// 方向，多选
    

UIPinchGestureRecognizer 捏合（缩放）

    UIPinchGestureRecognizer *gesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(test:)];
// 缩放比例，和缩放速度，可用与控制判断


// 举例
- (void)test:(UIPinchGestureRecognizer *)gesture { 
    if (gesture.state == UIGestureRecognizerStateChanged) {
        //捏合手势中scale属性记录的缩放比例
        if (gesture.scale < 2) {
            gesture.view.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale);
        }
    }
    
    //结束后恢复
    if(gesture.state==UIGestureRecognizerStateEnded) {
        [UIView animateWithDuration:0.5 animations:^{
            gesture.view.transform = CGAffineTransformIdentity;//取消一切形变
        }];
    }
}

UIPanGestureRecognizer 拖动

    UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(test:)];
    gesture.minimumNumberOfTouches = 1;
    gesture.maximumNumberOfTouches = 1;


// 举例
- (void)test:(UIPanGestureRecognizer *)gesture {
    CGPoint tarnslatePoint = [gesture translationInView:gesture.view];// 具体位置
    CGPoint velocityPoint = [gesture velocityInView:gesture.view];// 每次的偏移量
    
    if (gesture.state == UIGestureRecognizerStateChanged) {
        gesture.view.transform = CGAffineTransformMakeTranslation(tarnslatePoint.x, tarnslatePoint.y);
    } 

    if (gesture.state == UIGestureRecognizerStateEnded) {
        gesture.view.transform = CGAffineTransformIdentity;
    }
}

UIRotationGestureRecognizer 旋转

    UIRotationGestureRecognizer *gesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(test:)];
// 旋转角度，和旋转速度，可以用于控制判断
 
- (void)test:(UIRotationGestureRecognizer *)gesture {
    if (gesture.state==UIGestureRecognizerStateChanged) {
        gesture.view.transform=CGAffineTransformMakeRotation(gesture.rotation);
    }
    
    if(gesture.state==UIGestureRecognizerStateEnded) {
        gesture.view.transform=CGAffineTransformIdentity;
    }
}

其他

手势抽象类，以及其子类还有更多的方法，待考究。
上面结合 CGAffineTransform 可以看看另外的一篇内容简单介绍。http://www.jianshu.com/p/7b83bb32c74a

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