UIAlertView的文本字段在iOS8中不显示键盘 [英] UIAlertView's textfield does not show keyboard in iOS8

问题描述

@implementation
UIAlertView *query;
@end

- (void)viewWillAppear:(BOOL)animated {
query = [[UIAlertView alloc]
                      initWithTitle:NSLocalizedString(@"New", @"")
                      message:nil
                      delegate:self
                      cancelButtonTitle:NSLocalizedString(@"Cancel", nil)
                      otherButtonTitles:NSLocalizedString(@"OK", @""), nil];
query.alertViewStyle = UIAlertViewStylePlainTextInput;
UITextField *textField = [_query textFieldAtIndex:0];
textField.placeholder = NSLocalizedString(@"Title", @"placeholder text where user enters name for new playlist");
textField.delegate = self;
[_query show];
}

之后> UIAlertView 是显示，键盘也显示， UITextfield 是焦点（它只适用于iOS7之前，但在iOS8中不起作用）。我试过 [textfield becomeFirstResponder] ，但它没有用。我创建新项目并使用上面的cove，它可以工作。

After UIAlertView is shown, keyboard is shown too and UITextfield is focus (It just works on pre iOS7, but does not work in iOS8). I have tried [textfield becomeFirstResponder], but it does not worked. I create new project and use cove above, it works.

我的问题：键盘没有显示 UIAlertViewStylePlainTextInput 样式。

My problem: Keyboard does not shown with UIAlertViewStylePlainTextInput style.

我不知道为什么？任何人都可以帮助我吗？
谢谢。

I don't know why? Can anybody helps me? Thanks.

推荐答案

在调用show后，这个丑陋的黑客为我工作了：

This ugly hack worked for me, after calling show:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    // HACKHACK: This is to make the keyboard appear in iOS8
    UITextRange* textRange = self.textField.selectedTextRange;
    [self.textField selectAll:self];
    [UIMenuController sharedMenuController].menuVisible = NO;
    self.textField.selectedTextRange = textRange;
});

遇到同样的问题，花了几个小时摆弄UIAlertController，这是正确的解决方案，但不幸的是，其他地方有几个问题（例如，当它从弹出窗口中呈现时会中断），并且不适用于iOS7。

Ran into the same problem, and spent hours fiddling with UIAlertController, which is the "right" solution, but unfortunately has several issues elsewhere (e.g. it breaks when presenting from a popover), and won't work with iOS7.

这绝对是iOS8中的一个错误。我希望Apple尽快解决这个问题。不幸的是，即使使用为iOS7编译的旧二进制文件也可以打破它。

This is definitely a bug in iOS8. I hope Apple fixes this soon. It unfortunately breaks even with older binaries compiled for iOS7.

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