UINavigationBar在iOS8和更早版本中消失

Question

第一個ViewController由NavigationController管理，它有一個UIWebView。 WebView模塊具有點擊事件來推動NavigationController中的ViewController。

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但現在，這是由代碼初始化的ViewController是正常的，並且其是通過initstoryboard異常時，navigation bar被消失了。它只發生在iOS8和更早版本中。

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PS：初始化代碼是這樣的：

代碼：

ViewController *vc = [[ViewController alloc]init]; 
[self.navigationController pushViewController:vc animated:YES]; 

故事板：

ViewController *vc = [ViewController defaultViewControllerWithStoryboard:@"StoryboardName"]; 
[self.navigationController pushViewController:vc animated:YES]; 

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謝謝。

Answer 1

MainViewController* presentController = [self.storyboard instantiateViewControllerWithIdentifier:@"StoryBoardidentifier"]; 
[self.navigationController pushViewController:presentController animated:YES]; 

如果它不工作嘗試這個通常yourStoryBoardName是主營：

UIStoryboard* storyBoard = [UIStoryboard storyboardWithName:@"YourStoryBoardName" bundle:nil]; 
MainViewController* presentController = [storyBoard instantiateViewControllerWithIdentifier:@"StoryBoardIdentifier"]; 
[self.navigationController pushViewController:presentController animated:YES];