ResignFirstResponder不会关闭键盘(iPhone)

Question

我在这个网站上搜索过,我找不到解决我现在面临的问题的方法.希望有人能提供帮助.

我创建了一个UIAlertView来提示用户在iPhone应用程序中输入他们的名字.

    UIAlertView *enterNameAlert = [[UIAlertView alloc] initWithTitle:@"Enter your name"
                                                             message:@"\n\n\n"
                                                            delegate:self
                                                   cancelButtonTitle:NSLocalizedString(@"Cancel", nil)
                                                   otherButtonTitles:NSLocalizedString(@"OK", nil),nil];

    UITextField *enterNameField = [[UITextField alloc] initWithFrame:CGRectMake(16, 83, 252, 25)];
    enterNameField.keyboardAppearance = UIKeyboardAppearanceAlert;
    enterNameField.borderStyle = UITextBorderStyleRoundedRect;
    enterNameField.autocorrectionType = UITextAutocorrectionTypeNo;
    enterNameField.clearButtonMode = UITextFieldViewModeWhileEditing;
    enterNameField.returnKeyType = UIReturnKeyDone;
    enterNameField.delegate = self;
    [enterNameField becomeFirstResponder];
    [enterNameAlert addSubview:enterNameField];

    [enterNameAlert show];
    [enterNameAlert release];
    [enterNameField release];

我已经设置了这个viewController以符合头文件中的UITextFieldDelegate,并实现textFieldShouldReturn:了在用户点击Done时尝试关闭键盘.

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if ([textField isFirstResponder]) {
        [textField resignFirstResponder];
        NSLog(@"text field was first responder");
    } else {
        [textField becomeFirstResponder];
        [textField resignFirstResponder];
        NSLog(@"text field was not first responder");
    }
    NSLog(@"textfieldshouldreturn");
    return YES;
}

在调试器中,我确认当我点击Done按钮时成功调用此方法,textField是当时的第一个响应者.然而,键盘并没有消失,但是小小的clearButton消失了.显然textField不再是第一个响应者,因为当我再次单击Done按钮时,不会调用任何内容.我只是想用Done按钮关闭键盘.有人可以提供解决方案吗？百万谢谢.

Answer 1

首先,您需要定义您的enterNameAlertin接口标头.然后使用下面的代码.

- (void)viewDidLoad {    
    [super viewDidLoad];
    enterNameAlert = [[UIAlertView alloc] initWithTitle:@"Enter your name"
                                                             message:@"\n\n\n"
                                                            delegate:self
                                                   cancelButtonTitle:NSLocalizedString(@"Cancel", nil)
                                                   otherButtonTitles:NSLocalizedString(@"OK", nil),nil];

    UITextField *enterNameField = [[UITextField alloc] initWithFrame:CGRectMake(16, 83, 252, 25)];
    enterNameField.keyboardAppearance = UIKeyboardAppearanceAlert;
    enterNameField.borderStyle = UITextBorderStyleRoundedRect;
    enterNameField.autocorrectionType = UITextAutocorrectionTypeNo;
    enterNameField.clearButtonMode = UITextFieldViewModeWhileEditing;
    enterNameField.returnKeyType = UIReturnKeyDone;
    enterNameField.delegate = self;    
    [enterNameAlert addSubview:enterNameField];
    [enterNameField becomeFirstResponder];
    [enterNameAlert show];    
    [enterNameField release];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if ([textField isFirstResponder]) {
        [textField resignFirstResponder];
        [enterNameAlert dismissWithClickedButtonIndex:1 animated:YES];
        [enterNameAlert release];
        NSLog(@"text field was first responder");
    } else {
        [textField becomeFirstResponder];
        [textField resignFirstResponder];
        NSLog(@"text field was not first responder");
    }
    NSLog(@"textfieldshouldreturn");
    return YES;
}