IOS 开发中 Whose view is not in the window hierarchy 错误的解决办法

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在 一个 ViewController 里面调用另外一个 ViewController 是出现这个错误：该错误一般是由于在 viewDidLoad 里面调用引起的，解决办法是转移到 viewDidAppear 方法里面

在 AppDelegate.m 中调用遇到这个错误
解决办法1：

  CameraViewController *camera = [[CameraViewController alloc] init];            MainNavigationController *nav = [[MainNavigationController alloc] initWithRootViewController:camera];            camera.editImage.image = image;            AppDelegate *delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;            [delegate.window.rootViewController presentViewController:nav animated:YES completion:nil];

解决办法2：

 UIStoryboard *mainstoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];    LoginViewController* loginViewController = [mainstoryboard instantiateViewControllerWithIdentifier:@"LoginViewController"];    [self.window makeKeyAndVisible];//[LoginViewController presentViewController:yourController animated:YES completion:nil];//or[LoginViewController myMethod];

参考地址：http://stackoverflow.com/questions/11862883/whose-view-is-not-in-the-window-hierarchy

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