Question

在UIAlertController呈现ViewController时，是否可以更改@IBAction func offerAction(_ sender: UIButton) { var code: String = "Generating códe" let message: String = "El código para redimir esta oferta es: \(code)" let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert) let okAction = UIAlertAction(title: "Accept", style: .default, handler: nil) let redirect = UIAlertAction(title: "Website", style: .default) { (_) in // TODO open url web } if offer.redeemOfferOnline == .yes { alert.addAction(redirect) } alert.addAction(okAction) present(alert, animated: true, completion: nil) offer.code.getRedeemCode(id: offer.id) { (success, data) in if success { code = data alert.message = message // TODO end the code of changing the message of alert } } }的标题或消息文本。

例如，当用户按下带有此消息的按钮时，我会发出警告：

“等待兑换代码”

然后我使用 Alamofire 发出请求并获取代码，在我拥有它之后，我想要从警报中更改消息而不会再次出现并再次呈现，例如新的消息文本是它：

“您的兑换代码为：########”

更新

这是我的代码：

import java.util.Scanner;

public class AverageMaxMin {

    public static void main(String[] args) {

                System.out.println("Enter 4 numbers:");
                Scanner input=new Scanner(System.in); 

                    double a,b,c,d;

                    double avg;

                    a=input.nextDouble();
                    b=input.nextDouble();
                    c=input.nextDouble();
                    d=input.nextDouble();
                    avg=(double)(a+b+c+d)/4.0;
                    System.out.println("The Average is: " + avg);

    }
}

Answer 1

这当然是可能的，请检查以下内容：

class MyViewController:  UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let alertController = UIAlertController(title: "My Title", message: "My Message", preferredStyle: .alert)

        present(alertController, animated: true, completion: nil)

        // Do your queries and get your new title and then set the new title
        alertController.title = "Your new title"
    }

}

Answer 2

只需将alertcontroller定义为：

var controller:UIAlertController?

然后像这样初始化你的警报控制器：

  controller = UIAlertController(title: "Title", message: "Yo", preferredStyle: .alert)
  self.present(controller!, animated: true, completion: nil)

现在，当您从服务器获取数据时，请调用：

self.controller?.title = "New Title"

Answer 3

displayMyAlertMessage（userMessage：“Keshav Gera”）;

func displayMyAlertMessage(userMessage: String)
    {
        let alert = UIAlertController(title: "Success", message: userMessage, preferredStyle: .alert)

        let action = UIAlertAction(title: "OK", style: .default, handler: nil)

        let imgTitle = UIImage(named:"imgTitle.png")
        let imgViewTitle = UIImageView(frame: CGRect(x: 10, y: 10, width: 30, height: 30))
        imgViewTitle.image = imgTitle

        alert.view.addSubview(imgViewTitle)
        alert.addAction(action)

        self.present(alert, animated: true, completion: nil)
    }

Answer 4

可以更改标题和/或文本，并对更改进行动画处理，从而：

[UIView transitionWithView: alertController.view
                  duration: 0.3
                   options: UIViewAnimationOptionTransitionCrossDissolve
                animations: ^(void) {
                    alertController.message = newMessage;
                }
                completion: nil];

在演示期间更改UIAlertController消息或标题

4 个答案: