UIScrollView默認(rèn)手勢(shì)有：PagingSwipeGestureRecognizer、DelayedTouchesBeganGestureRecognizer、PanGestureRecognizer；UITableview只有后兩個(gè)手勢(shì)；

一般在含有UIScrollView或者UIScrollView的子類的視圖上添加自己的手勢(shì)就會(huì)有沖突；利用UIGestureRecognizerDelegate中的代理方法可以解決相應(yīng)的沖突；

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch

該代理方法可以攔截相應(yīng)的手勢(shì)，返回YES為攔截手勢(shì)；返回NO為不做處理；
相應(yīng)的手勢(shì)被攔截之后，就會(huì)執(zhí)行另一個(gè)代理方法：

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

例如：

場(chǎng)景：實(shí)現(xiàn)一個(gè)父子控制器，然后再劃到最兩邊的時(shí)候，實(shí)現(xiàn)抽屜效果；
實(shí)現(xiàn)：在主控制器的view上添加pan 手勢(shì)，不做任何處理時(shí)，系統(tǒng)默認(rèn)執(zhí)行UIScrollView的手勢(shì)；在第一個(gè)代理方法中判斷UIScrollView的偏移量，然后攔截手勢(shì)；然后在第二個(gè)代理方法對(duì)其進(jìn)行相應(yīng)的處理；

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
        CGFloat offsetX = self.scrollView.contentOffset.x;
       //滿足條件攔截手勢(shì)
        if (offsetX == self.scrollView.contentSize.width - screenSize.width || offsetX == 0.0) {
                return YES;
        }
    }
    return NO;
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
        UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;
        CGPoint translation = [pan translationInView:self.view];
        CGFloat offsetX = self.scrollView.contentOffset.x;
        if (translation.x > 0 && offsetX == 0.0 ) {
                if ([self.delegate respondsToSelector:@selector(centerControllerPrepareLeftView:)]) {
                    [self.delegate centerControllerPrepareLeftView:self];
                }
        }else if (translation.x < 0 && offsetX == self.scrollView.contentSize.width - screenSize.width){
                if ([self.delegate respondsToSelector:@selector(centerControllerPrepareRightView:)]) {
                    [self.delegate centerControllerPrepareRightView:self];
                }
        }
    }
    return YES;
}