//1.创建点按手势
- (void)tapGes {
    //1.创建点按手势
    UITapGestureRecognizer *tapGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
    
    tapGes.delegate = self;

    //2.添加手势
    [self.imageV addGestureRecognizer:tapGes];
    
}

//是否允许接收手指
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    
    //获取当前的点.
    CGPoint curP = [touch locationInView:self.imageV];
    //判断点在图片的左边还是右边;
    if (curP.x > self.imageV.bounds.size.width * 0.5) {
        //如果在右边,返回YES;
        return YES;
    }else {
        //否则返回NO;
        return NO;
    }
}

长按手势有3种状态调用时机：1，第一次响应的时候，2.手指不松开移动的时候，3.手指松开的时候
//1.创建长按
- (void)longPressGes {
    //1.创建长按
    UILongPressGestureRecognizer *longP = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longGes:)];
    
    //2.添加手势
    [self.imageV addGestureRecognizer:longP];
}

//长按手势分状态,长按移动时,会持续调用
- (void)longGes:(UILongPressGestureRecognizer *)longP {
    if (longP.state == UIGestureRecognizerStateBegan) {
        NSLog(@"UIGestureRecognizerStateBegan");
    }else if (longP.state == UIGestureRecognizerStateChanged) {
        NSLog(@"UIGestureRecognizerStateChanged");
    }else if (longP.state == UIGestureRecognizerStateEnded) {
        NSLog(@"UIGestureRecognizerStateEnded");
    }
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.imageV.userInteractionEnabled = YES;
    //添加手势
    //1.创建轻扫
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGes:)];
    //默认是向右轻扫
    //设置轻扫的方向
    //一个轻扫手势只能对应一个方向
    swipe.direction = UISwipeGestureRecognizerDirectionLeft;
    //2.添加手势
    [self.imageV addGestureRecognizer:swipe];
    
    //1.创建轻扫
    UISwipeGestureRecognizer *swipe2 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGes:)];
    //默认是向右轻扫
    //设置轻扫的方向
    //一个轻扫手势只能对应一个方向
    swipe2.direction = UISwipeGestureRecognizerDirectionRight;
    //2.添加手势
    [self.imageV addGestureRecognizer:swipe2];
}

- (void)swipeGes:(UISwipeGestureRecognizer *)swipe {
    if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"UISwipeGestureRecognizerDirectionLeft");
    }else if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
         NSLog(@"UISwipeGestureRecognizerDirectionRight");
    }
}

通过拖转手势获取的偏移量是相对最原始的点，也就是最开始拖动的点(松开手指第二次去拖转，同样相对的是第一次拖动的那个最原始的点,所以第二次拖动的时候，它回自动回去)

//1.创建平移
- (void)panGes {
    //添加手势
    //1.创建平移
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    //2.添加手势
    [self.imageV addGestureRecognizer:pan];
}

//当拖动时持续调用
- (void)pan:(UIPanGestureRecognizer *)pan {
    //获取偏移量
    //获取的偏移量是相对于最原始的点
    CGPoint transP = [pan translationInView:self.imageV];
    NSLog(@"%@",NSStringFromCGPoint(transP));
    
//    self.imageV.transform = CGAffineTransformMakeTranslation(transP.x, transP.y);
    self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform, transP.x, transP.y);
    
    //清0操作(不让偏移量进行累加,获取的是相对于上一次的值,每一次走的值.)
    [pan setTranslation:CGPointMake(0, 0) inView:self.imageV];
}

- (void)rotationGes {
    //1.创建旋转手势
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    rotation.delegate = self;
    //2.添加手势
    [self.imageV addGestureRecognizer:rotation];
}

- (void)rotation:(UIRotationGestureRecognizer *)rotationGes {
    //获取旋转角度(已经是弧度)
    //相对于最原始的弧度
    CGFloat rotatinon = rotationGes.rotation;
    self.imageV.transform = CGAffineTransformRotate(self.imageV.transform, rotatinon);
    //清0
    [rotationGes setRotation:0];
}

//1.创建捏合手势
- (void)pinchGes {
    //添加手势
    //1.创建捏合手势
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    pinch.delegate = self;
    //2.添加手势
    [self.imageV addGestureRecognizer:pinch];
}

- (void)pinch:(UIPinchGestureRecognizer *)pinch {
    //放大, 缩小
    //获取缩放比例(相对于最原始的比例)
    CGFloat scale = pinch.scale;
    self.imageV.transform = CGAffineTransformScale(self.imageV.transform, scale, scale);
    
    [pinch setScale:1];
}

//一个手势默认是不能够同时支持多个手势
//可以通过代理进行设置.
//是否允许同时支持多个手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}