最近做的一個項目，基本情況可以這樣描述：一個tableView，每個cell占據(jù)一個頁面，paging enabled屬性設置為YES，那么上下滑動會翻頁，每個cell都有一個立方體：

手勢沖突1.gif

然后我希望每個cell都可以在手指左右滑的時候，立方體能夠旋轉！你會想到加一個手勢不就行了么，是的，我也是這么做的:

        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
        pan.delegate = self;
        [self.contentView addGestureRecognizer:pan];

- (void)handlePan:(UIPanGestureRecognizer *)pan
{
    CGPoint point = [pan translationInView:self];
    switch (pan.state)
    {
        case UIGestureRecognizerStateBegan:
            self.prePoint = point;
            break;
            
        case UIGestureRecognizerStateChanged:
            [self changeCubeWithPoint:point prePoint:self.prePoint screenSize:self.screenSize];
            self.prePoint = point;
            break;
            
        default:
            break;
    }
}

但是你很快會發(fā)現(xiàn)，你的cell中的立方體確實在轉動，但是不能上下翻頁了。很顯然是UIPanGestureRecognizer和scrollView的滑動手勢沖突了,解決辦法是設置UIPanGestureRecognizer的代理UIGestureRecognizerDelegate，并實現(xiàn)代理方法：

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

-(BOOL)gestureRecognizer(UIGestureRecognizer*)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer方法的含義是該手勢能否與其它手勢一起被識別，如果按照上面這樣寫，你會發(fā)現(xiàn)確實既可以滑動又可以轉立方體了，但是滑動立方體的時候，你會很容易就誤翻頁了，tableView太不聽話了。真正希望的效果是在橫向滑動的時候，立方體轉動但是tableView別亂動，快速上下滑的時候tableView再翻頁！把上面的方法改成下面的：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
    {
        switch (gestureRecognizer.state)
        {
            case UIGestureRecognizerStateBegan:
            {
                UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;
                CGPoint velocity = [pan velocityInView:self];
                CGFloat Vx = fabs(velocity.x);
                CGFloat Vy = fabs(velocity.y);
                
                return !(Vx > Vy - 50.0 || Vy < 400.0 || Vx > 500.0);
            }
                break;
                
            case UIGestureRecognizerStateChanged:
                return NO;
                break;
                
            default:
                break;
        }
    }
    
    return YES;
}

意思就是手勢開始的時候，如果發(fā)現(xiàn)橫向滑動速度Vx比較大的時候，不要去滑動tableView了，如果UIPanGestureRecognizer手勢開始了（UIGestureRecognizerStateChanged），也不要去滑動了，只有當開始的時候上下滑速度Vy比較大的時候，才去滑動tableView，達到了我們要的效果：

手勢沖突2.gif