iOS:右划返回手势与scrollView左右滑冲突

原因：

scrollView的优先响应了手势事件，导致右划事件未响应

解决：

@implementation UIScrollView (BTGestureRecognizer)

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    // 首先判断otherGestureRecognizer是不是系统pop手势
    if ([otherGestureRecognizer.view isKindOfClass:NSClassFromString(@"UILayoutContainerView")]) {
        // 再判断系统手势的state是began还是fail，同时判断scrollView的位置是不是正好在最左边
        if (otherGestureRecognizer.state == UIGestureRecognizerStateBegan && self.contentOffset.x == 0) {
            return YES;
        }
    }
    
    return NO;
}

@end