如果模态 ViewController 呈现样式是 UIModalPresentationFormSheet，iPad 键盘不会关闭

问题描述

注意:

从 iOS 4.3 开始，请参阅已接受的答案(不是最高投票的答案).

See accepted answer (not top voted one) for solution as of iOS 4.3.

这个问题是关于在 iPad 键盘中发现的一个行为，如果它在带有导航控制器的模式对话框中显示，则它拒绝被关闭.

This question is about a behavior discovered in the iPad keyboard, where it refuses to be dismissed if shown in a modal dialog with a navigation controller.

基本上，如果我使用以下行显示导航控制器:

Basically, if I present the navigation controller with the following line as below:

navigationController.modalPresentationStyle = UIModalPresentationFormSheet;

键盘拒绝被解雇.如果我注释掉这一行，键盘就会消失.

The keyboard refuses to be dismissed. If I comment out this line, the keyboard goes away fine.

...

我有两个文本字段，用户名和密码；用户名有一个下一步按钮，密码有一个完成按钮.如果我在模态导航控制器中显示它，键盘不会消失.

I've got two textFields, username and password; username has a Next button and password has a Done button. The keyboard won't go away if I present this in a modal navigation controller.

工作

broken *b = [[broken alloc] initWithNibName:@"broken" bundle:nil];
[self.view addSubview:b.view];

不起作用

broken *b = [[broken alloc] initWithNibName:@"broken" bundle:nil];
UINavigationController *navigationController =
[[UINavigationController alloc]
 initWithRootViewController:b];
navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
navigationController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:navigationController animated:YES];
[navigationController release];
[b release];

如果我删除导航控制器部分并将b"本身作为模态视图控制器呈现，它就可以工作.是导航控制器的问题吗?

If I remove the navigation controller part and present 'b' as a modal view controller by itself, it works. Is the navigation controller the problem?

工作

broken *b = [[broken alloc] initWithNibName:@"broken" bundle:nil];
b.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:b animated:YES];
[b release];

工作

broken *b = [[broken alloc] initWithNibName:@"broken" bundle:nil];
UINavigationController *navigationController =
    [[UINavigationController alloc]
         initWithRootViewController:b];
[self presentModalViewController:navigationController animated:YES];
[navigationController release];
[b release];

推荐答案

在以模态呈现的视图控制器中，只需覆盖 disablesAutomaticKeyboardDismissal 即可返回 NO:

In the view controller that is presented modally, just override disablesAutomaticKeyboardDismissal to return NO:

- (BOOL)disablesAutomaticKeyboardDismissal {
    return NO;
}

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