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我有三個視圖控制器，a，b和c。我從一開始，現在b。如果用戶註銷，則顯示c。否則我留在b，下面的代碼片段來自。如果我只是從a到b，presentingViewController設置爲a，一切都很好。如果提交c，一旦我解僱c，presentingViewController返回nil，我被困在b上。PresentingViewController被設置爲零
UIViewController* parent = self.navigationController.presentingViewController;
self.navigationController.viewControllers = @[[[UIViewController alloc] init]];
[parent dismissModalViewControllerAnimated: NO];
[parent presentModalViewController: self animated: NO];
[parent dismissModalViewControllerAnimated: YES];