最近项目集成融云IMKit，发现聊天页面，选择图片-->预览--->导航栏异常，如下图

定位发现，融云RCPhotoPreviewCollectionViewController类虽然设置了隐藏导航栏，但最后被覆盖了，被覆盖位置

- (void)fd_viewWillDisappear:(BOOL)animated{    // Forward to primary implementation.    [self fd_viewWillDisappear:animated];        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        UIViewController *viewController = self.navigationController.viewControllers.lastObject;        if (viewController && !viewController.fd_prefersNavigationBarHidden) {            [self.navigationController setNavigationBarHidden:NO animated:NO];        }    });}复制代码

处理方案

方法1.

修改UINavigationController+FDFullscreenPopGesture，过滤不处理融云RCPhotoPreviewCollectionViewController类导航栏

- (void)fd_viewWillDisappear:(BOOL)animated{    // Forward to primary implementation.    [self fd_viewWillDisappear:animated];        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        UIViewController *viewController = self.navigationController.viewControllers.lastObject;        if (viewController && !viewController.fd_prefersNavigationBarHidden) {            NSString *classString = NSStringFromClass(viewController.class);            if ([classString isEqualToString:@"RCPhotoPreviewCollectionViewController"]) {
   return;}            [self.navigationController setNavigationBarHidden:NO animated:NO];        }    });}复制代码

方法2.舍弃其一。