• （ios）手勢(shì)包括以下6種

UITapGestureRecognizer //點(diǎn)擊手勢(shì)
UILongPressGestureRecognizer // 長(zhǎng)按手勢(shì)
UISwipeGestureRecognizer    // 輕掃手勢(shì)
UIRotationGestureRecognizer // 旋轉(zhuǎn)手勢(shì)
UIPinchGestureRecognizer    //捏合手勢(shì)
UIPanGestureRecognizer      //拖拽手勢(shì)

• UIGestureRecognizerDelegate

// 是否允許開始觸發(fā)手勢(shì)
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    return NO;
}

// 是否允許同時(shí)支持多個(gè)手勢(shì)，默認(rèn)是不支持多個(gè)手勢(shì)
// 返回yes表示支持多個(gè)手勢(shì)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

// 是否允許接收手指的觸摸點(diǎn)
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    // 獲取當(dāng)前的觸摸點(diǎn)
    CGPoint curP = [touch locationInView:self.imageView];
    //下面表示當(dāng)觸摸點(diǎn)在self.imageView 在中心點(diǎn)左面點(diǎn)擊不觸發(fā)事件，在右面則觸發(fā)點(diǎn)擊事件
    if (curP.x < self.imageView.bounds.size.width * 0.5) {
        return NO;
    }else{
        return YES;
    }
}

• 手勢(shì)觸發(fā)事件需要注意的地方

// 創(chuàng)建點(diǎn)按手勢(shì)
- (void)setUpTap
{
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
    
    tap.delegate = self;
  //連續(xù)點(diǎn)擊兩次
    tap.numberOfTapsRequired = 2;
    //需要兩跟手指一起敲擊
    tap.numberOfTouchesRequired =2;
    
    [_imageView addGestureRecognizer:tap];
}

- (void)tap:(UITapGestureRecognizer *)tap
{
    NSLog(@"%s",__func__);
}
//創(chuàng)建長(zhǎng)按手勢(shì)
- (void)setUpLongPress
{
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    
    [self.imageView addGestureRecognizer:longPress];
}


- (void)longPress:(UILongPressGestureRecognizer *)longPress
{
    // 默認(rèn)會(huì)觸發(fā)兩次，所以需要加上狀態(tài)去限制
    if (longPress.state == UIGestureRecognizerStateBegan) {
        
        NSLog(@"%s",__func__);
    }
}
//創(chuàng)建輕掃手勢(shì)
- (void)setUpSwipe
{
    // 默認(rèn)輕掃的方向是往右
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe)];
    //設(shè)置輕掃手勢(shì)的方向
    swipe.direction = UISwipeGestureRecognizerDirectionUp;
    
    [self.imageView addGestureRecognizer:swipe];
    
    // 如果以后想要一個(gè)控件支持多個(gè)方向的輕掃，必須創(chuàng)建多個(gè)輕掃手勢(shì)，一個(gè)輕掃手勢(shì)只支持一個(gè)方向
    // 默認(rèn)輕掃的方向是往右
    UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe)];
    
    swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
    
    [self.imageView addGestureRecognizer:swipeDown];

    
}

- (void)swipe
{
    NSLog(@"%s",__func__);
}
//創(chuàng)建旋轉(zhuǎn)手勢(shì)
- (void)setUpRotation
{
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    rotation.delegate = self;
    [self.imageView addGestureRecognizer:rotation];
}

// 默認(rèn)傳遞的旋轉(zhuǎn)的角度都是相對(duì)于最開始的位置
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
    
    self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);
    // 可以不加下面這句復(fù)位的代碼試一下效果
    // 復(fù)位
    rotation.rotation = 0;
    
    // 獲取手勢(shì)旋轉(zhuǎn)的角度
    NSLog(@"%f",rotation.rotation);
}
//創(chuàng)建捏合手勢(shì)
- (void)setUpPinch
{
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    pinch.delegate = self;
    [self.imageView addGestureRecognizer:pinch];
}
//默認(rèn)傳遞的的縮放比例都是相對(duì)于最開始的大小
- (void)pinch:(UIPinchGestureRecognizer *)pinch
{
    self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
    
    // 復(fù)位
    pinch.scale = 1;
}
//創(chuàng)建拖拽手勢(shì)
- (void)setUpPan
{
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    
    
    [self.imageView addGestureRecognizer:pan];
}
//一樣是默認(rèn)是相對(duì)于最初位置
- (void)pan:(UIPanGestureRecognizer *)pan
{
    // 獲取手勢(shì)的觸摸點(diǎn)
   // CGPoint curP = [pan locationInView:self.imageView];
    
    // 移動(dòng)視圖
    // 獲取手勢(shì)的移動(dòng)，也是相對(duì)于最開始的位置
    CGPoint transP = [pan translationInView:self.imageView];
    
    self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);
    
    // 復(fù)位
    [pan setTranslation:CGPointZero inView:self.imageView];
    
  //  NSLog(@"%@",NSStringFromCGPoint(curP));
}