让scrollview的滑动与系统的边缘滑动返回共存
[mainScrollView.panGestureRecognizer requireGestureRecognizerToFail:self.navigationController.interactivePopGestureRecognizer];
//scrollview 与 右滑手势冲突问题解决
UIScreenEdgePanGestureRecognizer *screenEdgePanGestureRecognizer = self.navigationController.screenEdgePanGestureRecognizer;
[mainScrollView.panGestureRecognizer requireGestureRecognizerToFail:screenEdgePanGestureRecognizer];