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Question

看来有很多问题要问这个，但我尝试过的任何事都不适合我。简单地说，我希望UIAlertView带UIAlertViewStylePlainTextInput，但输入框在显示时预先加载了给定字符串 - 不是占位符，而是默认条目。这可能吗？

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"message" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[[alert textFieldAtIndex:0] setText:[NSString stringWithFormat:@"%@", @"preloaded string"]];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];

上面的示例使用了无效的setText。我也尝试过：

[[alert textFieldAtIndex:0] setPlaceholder:@"text"];

只是为了兴趣，但这甚至不显示占位符，所以也许我错过了其他的东西。

任何指针？

Answer 1

改为使用UIAlertController：

let alertController = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alertController.addTextFieldWithConfigurationHandler { (textField) -> Void in
    // Configure UITextField here...
    textField.placeholder = "Placeholder"
}
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) { (_) -> Void in
    let textField = alertController.textFields![0] as UITextField
    let value = textField.text ?? "Untitled"
    /// Save value here...
}
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
alertController.addAction(okAction)
alertController.addAction(cancelAction)
presentViewController(alertController, animated: true, completion: nil)

Answer 2

你可以像

那样做

<强> AlertView

 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"sample" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Done", nil];

    [alert setAlertViewStyle: UIAlertViewStylePlainTextInput];
    // Alert style customization

    [[alert textFieldAtIndex:0] setDelegate:self];      
    [[alert textFieldAtIndex:0] setKeyboardType:UIKeyboardTypeNumberPad];
    [[alert textFieldAtIndex:0] setText:@"Richard"];        
    [[alert textFieldAtIndex:0] setPlaceholder:@"textvalue"];

    [alert show];

<强> UIAlertController

 UIAlertController *alert = [UIAlertController

                                alertControllerWithTitle:@"sample"

                                message:@" "

                                preferredStyle:UIAlertControllerStyleAlert];



    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField)

     {


         [textField setText:@"Richard"];
         textField.placeholder = NSLocalizedString(@"textvalue", @"Login");


     }];
  [alert addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
 // do your action on ok click

  }]];

    [alert addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {


    // do your action on cancel click
    }]];

    UIViewController *viewController = [[[[UIApplication sharedApplication] delegate] window] rootViewController];

    if ( viewController.presentedViewController && !viewController.presentedViewController.isBeingDismissed ) {

        viewController = viewController.presentedViewController;

    }



    NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:viewController.view.frame.size.height*2.0f];

    [alert.view addConstraint:constraint];



    [viewController presentViewController:alert animated:YES completion:^{



    }];

Answer 3

您需要创建自己的自定义“弹出式”视图，其类似于here中的UIAlertview或使用像SDCAlertView这样的开源实现

你还可以做的是使用UIAlertController（因为UIAlertview在IOS 8中也被弃用）

 UITextField *alert = alertController.textFields.firstObject;
 [alert setText@"YOUR ALERT TEXT HERE"];

Answer 4

它正在100％工作

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"message" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[[alert textFieldAtIndex:0] setText:[NSString stringWithFormat:@"%@", @"preloaded string"]];
[alert show];