ios - 全局创建显示警报功能并从任何 View Controller 调用它

Question

func displayalert(title:String, message:String, vc:UIViewController)
{
    let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction((UIAlertAction(title: "OK", style: .default, handler: { (action) -> Void in

        self.dismiss(animated: true, completion: nil)

    })))

    vc.present(alert, animated: true, completion: nil)


}


this is the function i have used.i tried to call it like this,

 displayalert1(title:"dsfvasdcs", message:"easfSDXCSDZX", vc:validateOTPViewController())

它返回错误“BAD ACCESS”。 vc.present 像循环一样运行。我不明白问题出在哪里。

Answer 1

我运行了您的代码，它工作正常。我认为你会在 vc 中传递 self 。

 self.displayalert(title: "Title", message: "Some Message", vc: self)

您还可以扩展 UIViewController-

   extension UIViewController {
          // Your Function...
    }

现在您可以从任何 View Controller 全局访问此功能，只需键入 -

    self.displayalert(title: "Title", message: "Some Message", vc: self)