ios - 如何在 uialertview Controller 的 uitext 字段中没有输入时禁用两个 uialertcontroller 按钮

Question

<分区>

Answer 1

最初禁用按钮，然后在文本字段中有内容后重新启用它们。

UIAlertController *alert = [UIAlertController
                                  alertControllerWithTitle:@"Info"
                                  message:@"You are using UIAlertController with Actionsheet and text fields"


preferredStyle:UIAlertControllerStyleAlert];


UIAlertAction* ok = [UIAlertAction
                     actionWithTitle:@"OK"
                     style:UIAlertActionStyleDefault
                     handler:^(UIAlertAction * action)
                     {
                         NSLog(@"Resolving UIAlert Action for tapping OK Button");
                         [alert dismissViewControllerAnimated:YES completion:nil];

                     }];
UIAlertAction* cancel = [UIAlertAction
                         actionWithTitle:@"Cancel"
                         style:UIAlertActionStyleDefault
                         handler:^(UIAlertAction * action)
                         {
                             NSLog(@"Resolving UIAlertActionController for tapping cancel button");
                             [alert dismissViewControllerAnimated:YES completion:nil];

                         }];
[ok setEnabled:false];

[cancel setEnabled:false];

[alert addAction:ok];
[alert addAction:cancel];

将选择器添加到文本字段然后处理它:

[alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    textField.placeholder = @"iCloud ID";
    textField.textColor = [UIColor blueColor];
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    textField.borderStyle = UITextBorderStyleRoundedRect;
    [textField addTarget:self action:@selector(textDidChange:) forControlEvents:UIControlEventEditingChanged];
}];

- (void)textDidChange:(UITextField *)textField {
    if (textField.text.length > 0) {
        // enable the buttons
    }
}

要处理文本字段委托(delegate)，您可以阅读以下文章:

• Access input from UIAlertController
• Check on UIAlertController TextField for enabling the button