Ios 如果模态 ViewController 演示样式为 UIModalPresentationFormSheet，iPad 键盘将不会关闭

Note:

有关IOS 4.3版的解决方案，请参阅已接受的答案(不是投票最多的答案).

这question是关于在iPad键盘上发现的一种行为，如果在与导航控制器的模式对话框中显示，它拒绝被忽略.

基本上，如果我向导航控制器展示以下内容:

navigationController.modalPresentationStyle = UIModalPresentationFormSheet;

键盘拒绝被解雇.如果我注释掉这行，键盘可以正常离开.

...

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演示，键盘不会消失.

WORKS个个

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

DOES NOT WORK

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"本身表示为模式视图控制器，它就可以工作.导航控制器有问题吗？

WORKS个个

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

WORKS个个

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