presentModalViewController无法正常工作 [英] presentModalViewController not working

问题描述

这是我的代码：

ViewController *vc = [[ViewController alloc] initWithNibName:@"TableView" bundle:nil];
[self.navigationController presentModalViewController:vc animated:YES];
//[self setView:[vc view]];

如果我打电话，没有任何反应。但是，如果我将其更改为：

If I call it, nothing happens. However, if I change it to:

ViewController *vc = [[ViewController alloc] initWithNibName:@"TableView" bundle:nil];
//[self.navigationController presentModalViewController:vc animated:YES];
[self setView:[vc view]];

视图看起来很好（当然没有过渡）。
我做错了什么？初始化视图控制器时是否有任何特殊需要处理？我试图尽可能多地从Apple的例子中复制，但我不能让它工作......

The view appears just fine (without the transition, of course). What am I doing wrong? Is there anything special you have to take care of when initializing the view controller? I tried to copy as much as possible from Apple's examples, but I can't get this to work...

感谢您的任何输入！

- Ry

推荐答案

您只能从已经存在的控制器中呈现模态视图控制器屏幕上显示（通常通过UINavigationController或UITabBarController）。尝试创建一个UINavigationController，将viewController推送到它，然后然后呈现你的模态控制器。在Xcode中有一个初学者项目，它展示了如果你不熟悉它，如何创建一个基于UINavigationController的流程。

You can only present modal view controllers from controllers that have already been shown onscreen (usually through a UINavigationController or UITabBarController). Try creating a UINavigationController, pushing a viewController to it, and then presenting your modal controller. There's a starter project in Xcode that shows how to create a UINavigationController-based flow if you're unfamiliar with it.

还有一点要注意：如果你还没有将视图控制器推送到UINavigationController，.navigationController属性将为nil，并且它的消息将无效。

One other thing to note: if you haven't pushed the view controller onto a UINavigationController, the .navigationController property will be nil, and messaging it will have no effect.

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