UIInputViewController键盘未在iOS 8中显示

Question

我创建了自定义键盘。 但有些时候我的键盘没有显示在我的iOS8 iPhone5S中

请检查以下代码。 我做错了什么。

我的代码：

   // Perform custom UI setup here
self.nextKeyboardButton = [UIButton buttonWithType:UIButtonTypeSystem];

[self.nextKeyboardButton setTitle:NSLocalizedString(@"Next Keyboard", @"Title for 'Next Keyboard' button") forState:UIControlStateNormal];
[self.nextKeyboardButton sizeToFit];
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = NO;

[self.nextKeyboardButton addTarget:self action:@selector(advanceToNextInputMode) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:self.nextKeyboardButton];

NSLayoutConstraint *nextKeyboardButtonLeftSideConstraint = [NSLayoutConstraint constraintWithItem:self.nextKeyboardButton attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0];
NSLayoutConstraint *nextKeyboardButtonBottomConstraint = [NSLayoutConstraint constraintWithItem:self.nextKeyboardButton attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0];



UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self
           action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(0.0, 0.0, 160.0, 160.0);
[self.view  addSubview:button];


[self.view addConstraints:@[nextKeyboardButtonLeftSideConstraint, nextKeyboardButtonBottomConstraint]];

Answer 1

你按照这个步骤了吗？ 因为它适合我。 你可以在这里找到更多

Use the toolbar to ensure that the active scheme specifies the containing app and an iOS Simulator device.

Choose Product > Run, or click the Play button at the upper left of the Xcode project window.
After the containing app and keyboard build and get installed in the simulator, you see the empty containing app running.

In iOS Simulator, choose Hardware > Home to view Springboard.
Go to Settings > General > Keyboard > Keyboards.
Tap Add New Keyboard.

In the Purchased Keyboards group, tap the name of your new keyboard. A modal view appears with a switch to enable your keyboard.

Tap the switch to enable your keyboard. A warning alert appears.
In the warning alert, tap Add Keyboard to finish enabling your new keyboard. Then tap Done.
Choose Hardware > Home to view Springboard.

In Springboard, pull down to reveal the Spotlight search field.

In the system keyboard, now onscreen, tap and hold the globe key to show the list of enabled keyboards. Then tap on the custom keyboard you just installed.

Answer 2

和这里一样 ！ 我得出结论，这是iOS8测试版的一个错误。您可以通过退出键盘显示的应用程序再次显示键盘，然后重新启动应用程序，然后键盘正常显示。