两个滑动手势冲突处理

手势的话，有一个可以解决这个问题的API方法，如果otherGestureRecognizer这个手势没有执行成功的话，才会执行调用这个方法的手势。

- (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer

- (UIScreenEdgePanGestureRecognizer *)screenEdgePanGestureRecognizer//获取边缘返回手势
{
    UIScreenEdgePanGestureRecognizer *screenEdgePanGestureRecognizer = nil;

    if (self.navigationController.view.gestureRecognizers.count > 0) {
        for (UIGestureRecognizer *recognizer in self.navigationController.view.gestureRecognizers){
            if ([recognizer isKindOfClass:[UIScreenEdgePanGestureRecognizer class]]) {
                screenEdgePanGestureRecognizer = (UIScreenEdgePanGestureRecognizer *)recognizer;
                break;
            }
        }
    }
    return screenEdgePanGestureRecognizer;
}我们在操作滚动视图的时候的，只要滚动视图的手势能够触发，就不会执行滑动返回的那个手势，并且除了这个滚动视图外，在其他地方对滑动返回没有影响。

[[self screenEdgePanGestureRecognizer] requireGestureRecognizerToFail:self.scrollView.panGestureRecognizer];