iOS 7：离开模态ViewController后键盘没有显示 [英] iOS 7: Keyboard not showing after leaving modal ViewController

问题描述

我有一个 HomeViewController ，它与其他几个 UIViewControllers 有不同的模态segue。如果我试图在HomeView中的 UITextField 上显示键盘，一切正常。但是，如果我尝试在从任何模态视图返回后在 UITextField （使用 becomeFirstResponder ）上显示键盘控制器，键盘从不显示。

I've got a HomeViewController that has different modal segues to several other UIViewControllers. If I try to show the keyboard on a UITextField within the HomeView, everything works fine. However, if I try to show the keyboard on a UITextField (using becomeFirstResponder) after returning from any of the modal View Controllers, the keyboard never shows.

以下是我试过的其中一个设置的示例代码：

Here's some sample code from one of the setups I've tried:

在 HomeViewController ：

- (void)viewDidAppear:(BOOL)animated
{
    static BOOL firstTimeComplete = false;
    if (!firstTimeComplete) {
        firstTimeComplete = true;
    } else {
        UITextField *textField = [[UITextField alloc] init];
        [self.view addSubview:textField];
        [textField performSelector:@selector(becomeFirstResponder) withObject:nil afterDelay:3]
    }
}

在 ModalViewController ：

- (IBAction)done:(id)sender 
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

其中已完成：通过内部补充事件链接到完成按钮。

Where done: is linked to the "Done" button via a touch up inside event.

我尝试过的一些事情：

• 将模态segues转换为推送segues修复了问题，但我不想在任何子视图中使用导航栏


• 我是在解雇
  模态视图控制器时尝试禁用和启用动画（使用 dismissViewControllerAnimated：）


• 在故事板中使用展开segue而不是以编程方式进行

任何人都知道可能会发生什么？

Anyone have an idea of what may be going on?

推荐答案

在删除大量代码后，我终于发现正在使用自定义NavigationController，这是根本原因：

After deleting tons of code, I finally found out that a custom NavigationController was being used and this was the root cause:

@implementation MSLNavigationController

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationPortrait;
}

- (BOOL)shouldAutorotate
{
    return NO;
}

@end

该应用不需要这段代码，所以我已经核了这个文件。 （但是解释为什么这会隐藏键盘会很棒:)）

The app doesn't need this code, so I've nuked the file. (But an explanation as to why this would be hiding the keyboard would be awesome :))

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