如果模态ViewController演示样式为UIModalPresentationFormSheet, iPad键盘将不会解散

注意:

关于iOS 4.3的解决方案，请参阅已接受的答案(不是投票最多的答案)。

这个问题是关于在iPad键盘上发现的一个行为，如果在导航控制器的模态对话框中显示，它拒绝被驳回。

基本上，如果我用下面这行来显示导航控制器:

navigationController.modalPresentationStyle = UIModalPresentationFormSheet;

键盘拒绝被忽略。如果我注释掉这一行，键盘就会消失。

...

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。如果我在模式导航控制器中呈现这个，键盘就不会消失。

作品

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];

如果我移除导航控制器部分，并将'b'单独表示为一个模态视图控制器，它可以工作。导航控制器有问题吗?

作品

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

作品

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

当前回答

我通过使用UIModalPresentationPageSheet演示样式来解决这个问题，并在我呈现它之后立即调整它的大小。像这样:

viewController.modalPresentationStyle = UIModalPresentationPageSheet;
viewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:viewController animated:YES];
viewController.view.superview.autoresizingMask = 
    UIViewAutoresizingFlexibleTopMargin | 
    UIViewAutoresizingFlexibleBottomMargin;    
viewController.view.superview.frame = CGRectMake(
    viewController.view.superview.frame.origin.x,
    viewController.view.superview.frame.origin.y,
    540.0f,
    529.0f
);
viewController.view.superview.center = self.view.center;
[viewController release];

2010-12-15 22:14:14

其他回答

可能不是一个完美的解决方案，但有效 (自我。视图endEditing:是的); 从你的按钮或手势实现的任何地方呈现模态

2015-05-08 08:41:12

我通过使用UIModalPresentationPageSheet演示样式来解决这个问题，并在我呈现它之后立即调整它的大小。像这样:

viewController.modalPresentationStyle = UIModalPresentationPageSheet;
viewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:viewController animated:YES];
viewController.view.superview.autoresizingMask = 
    UIViewAutoresizingFlexibleTopMargin | 
    UIViewAutoresizingFlexibleBottomMargin;    
viewController.view.superview.frame = CGRectMake(
    viewController.view.superview.frame.origin.x,
    viewController.view.superview.frame.origin.y,
    540.0f,
    529.0f
);
viewController.view.superview.center = self.view.center;
[viewController release];

2010-12-15 22:14:14

把这段代码放在当前控制器的viewWillDisappear:方法中是另一种解决这个问题的方法:

Class UIKeyboardImpl = NSClassFromString(@"UIKeyboardImpl");
id activeInstance = [UIKeyboardImpl performSelector:@selector(activeInstance)];
[activeInstance performSelector:@selector(dismissKeyboard)];

2014-05-24 09:08:07

Swift 4.1:
extension UINavigationController {
   override open var disablesAutomaticKeyboardDismissal: Bool {
      return false
   }
}

2018-02-01 05:29:42

如果你切换不同的模式显示，你可以让键盘消失。它并不漂亮，也没有动画效果，但你可以让它消失。

如果有修复的话就太好了，但目前这是可行的。你可以把它楔入UIViewController的一个类别中，当你想要键盘消失时调用它:

@interface _TempUIVC : UIViewController
@end

@implementation _TempUIVC
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}
@end

@implementation UIViewController (Helpers)

- (void)_dismissModalViewController {
    [self dismissModalViewControllerAnimated:NO];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];
    [self release];
}

- (void)forceKeyboardDismissUsingModalToggle:(BOOL)animated {
    [self retain];
    _TempUIVC *tuivc = [[_TempUIVC alloc] init];
    tuivc.modalPresentationStyle = UIModalPresentationCurrentContext;
    [self presentModalViewController:tuivc animated:animated];
    if (animated) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_dismissModalViewController) name:UIKeyboardDidHideNotification object:nil];
    } else
        [self _dismissModalViewController];
    [tuivc release];
}

@end

注意，当你调用viewDidAppear / viewDidDisappear时所有这些方法都会被调用。就像我说的，虽然不漂亮，但确实有用。

亚当

2010-12-09 12:22:59

如果模态ViewController演示样式为UIModalPresentationFormSheet, iPad键盘将不会解散

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