由于想在项目中加入，任意界面都能够在边缘滑动返回上一级，于是使用了 UIGestureRecognizerDelegate self.navigationController.interactivePopGestureRecognizer.delegate = self;
却引入了问题： 应用中使用了MMDrawerController实现左边侧边栏功能。在主页进入二级界面后。再返回。当多次在边缘尝试滑动打开侧边栏时可以必现bug(整个界面无法操作)，当再次尝试边缘滑动时，发现从右边缘出现了上次打开的二级菜单。
解决方案： 在导航栏基类中需要遵守 UINavigationControllerDelegate
- (void)viewDidLoad { [super viewDidLoad]; __weak HyBaseNavgationController *weakSelf = self; if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) { self.interactivePopGestureRecognizer.delegate = weakSelf; self.delegate = weakSelf; } } - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated { if ( [self respondsToSelector:@selector(interactivePopGestureRecognizer)]&&animated == YES ){ self.interactivePopGestureRecognizer.enabled = NO; } } - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animate { if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]){ if (navigationController.childViewControllers.count == 1) { self.interactivePopGestureRecognizer.enabled = NO; }else self.interactivePopGestureRecognizer.enabled = YES; } }