uialertcontroller

问题 let location = CLLocationCoordinate2D(latitude: 32.075300, longitude: 34.782563) @IBAction func DirectionsTolocationButton(_ sender: Any) { // Create the AlertController and add its actions like button in ActionSheet let ActionSheet = UIAlertController(title: "Please Select A Navigation Service.", message: nil, preferredStyle: .actionSheet) let AppleMapsButton = UIAlertAction(title: "Apple Maps", style: .default) { action -> Void in let destinationName = (self.barNameTemplate ) self

问题 I have added a UITextField to UIAlertController, but shouldChangeCharactersInRange will get not fired. Why? I set the delegate. let alertController = UIAlertController(title: "", message: "xxx", preferredStyle: .Alert) self.presentViewController(alertController, animated:true, completion:nil) let textField = UITextField() textField.delegate = self alertController.addTextFieldWithConfigurationHandler(nil) and in the same class, the delegate: func textField(textField: UITextField!,

问题 UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:nil preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *action = [UIAlertAction actionWithTitle:@"action" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { [self doSomething]; }]; [alert addAction:action]; [self presentViewController:alert animated:YES completion:nil]; I understand the cycle . self retains the UIAlertController , UIAlertController retains the

问题 I am trying to change the title and message font for an alert shown using UIAlertController I am trying to do using an NSAttributedStirng, but it gives compiler error that a NSAttributed string cannot be taken instead of Stirng I tried something similar to this var title_attrs = [NSFontAttributeName : CustomFonts.HELVETICA_NEUE_MEDIUM_16] var msg_attrs = [NSFontAttributeName : CustomFonts.HELVETICA_NEUE_REGULAR_14] var title = NSMutableAttributedString(string:"Done", attributes:title_attrs)

问题 I'm presenting a list of options to the user using an UIAlertController from a UIToolbar with a preferred style of action sheet. When presented, the popover's arrow is cut off and its corners are rounded with two different radii: The code I'm using to present it is straight from the documentation, as far as I see it: UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet]; NSArray *actions = @[

问题 UIAlertController custom font doesn't work. The following code is a function ShowActionSheetAsync , show ActionSheet . At this point, I want to change the font of ActionSheet . I have tried several ways, but it didn't work well. Is there good solution? public Task<bool> ShowActionSheetAsync() { var source = new TaskCompletionSource<bool>(); var alert = new UIAlertController { Title = "title" }; alert.AddAction(UIAlertAction.Create( "button1", UIAlertActionStyle.Default, _ => source.SetResult

问题 I've created a UIAlertController with the preferred style of UIAlertControllerStyleAlert . The alert shows when the leftBarButtonItem is tapped. I created a UIBarButtonItem property called backButton and set the leftBarButtonItem = self.backButton . This is working as designed. I'm not using storyboards. The problem is that the leftBarButtonItem moves down (my guess: about 20pts) when the alert shows. Why is this happening? I know how to show/hide the button so the user can't see that the

问题 I'm using the Twitter login in the signup process of my app. And I'm asking for the user's email. Once I get it, I'd like to present a UIAlertController. Here's my code: func askForTWMail(){ if (Twitter.sharedInstance().session() != nil) { let shareMailVC=TWTRShareEmailViewController(completion: {(mail:String!, error:NSError!) in if (mail != nil) { print("GOT MAIL: \(mail)") self.gotMail() }else{ print("MAIL VC ERROR: \(error)") } }) println("PRESENT MAIL VC") self.presentViewController

问题 I have a legacy codebase I am managing, which needs to display alert messages from all over the place. This is terrible practice and is in need of a refactor, but that isn't going to happen any time soon. With iOS 9 I need the ability to fire & forget an alert view, and have the view display and queuing managed for me. 回答1: To show, UIAlertController , we need object of UIViewController So you can use below way to do that. UIWindow *keyWindow = [[UIApplication sharedApplication]keyWindow];

问题 I want to have a simple UIAlertController with image in it. what should I do? let alertMessage = UIAlertController(title: "Service Unavailable", message: "Please retry later", preferredStyle: .Alert) alertMessage.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil)) self.presentViewController(alertMessage, animated: true, completion: nil) 回答1: Try this: let alertMessage = UIAlertController(title: "Service Unavailable", message: "Please retry later", preferredStyle: .Alert) let