window模态导航控制器出现的问题 "whose view is not in the window hierarchy!"_<uiviewcontroller: 0x7f9db6547be0>) whose view is -优快云博客

本文链接：https://blog.youkuaiyun.com/sinat_22545219/article/details/52709190

本文介绍了一个常见的iOS开发中遇到的问题：尝试在不在窗口层级中的视图控制器上展示模态视图控制器导致的警告，并提供了一个实用的方法来找到当前处于最顶层的视图控制器，以便正确地弹出模态视图。

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Warning: Attempt to present <UINavigationController: 0x6e8ade0> on <LoginViewController: 0x6b3ef90> whose view is not in the window hierarchy!

错误信息如上:

解决办法:

想当前的controller 直接模态
通过我下面的函数可以获取当前的controller  （    [[self topViewController] presentViewController:[[UIViewController alloc] init] animated:YES completion:nil];）
- (UIViewController*)topViewController
{
    return [self topViewControllerWithRootViewController:self.window.rootViewController];
}

- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController
{
    if ([rootViewController isKindOfClass:[UITabBarController class]]) {
        UITabBarController *tabBarController = (UITabBarController *)rootViewController;
        return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
    } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController* navigationController = (UINavigationController*)rootViewController;
        return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
    } else if (rootViewController.presentedViewController) {
        UIViewController* presentedViewController = rootViewController.presentedViewController;
        return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
        return rootViewController;
    }
}