如何在全球范围内创建uialertcontroller [英] How to create uialertcontroller in global swift

问题描述

我正在尝试在 Config.swift 文件中创建 uialertcontroller ，如下所示。

I'm trying to create uialertcontroller in Config.swift file as follow.

static func showAlertMessage(titleStr:String, messageStr:String) -> Void {
    let window : UIWindow?
    let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
    self.window!.presentViewController(alert, animated: true, completion: nil)
}

问题是我在 self.window中发现问题！。

类型'Config'没有会员'窗口'

Type 'Config' has no member 'window'

请告诉我如何解决该问题。

Please let me know how to solve that issue.

推荐答案

self.window 意味着有一个窗口此类中的对象，情况并非如此。

self.window would mean that there's a window object in this class, and it's not the case.

您需要使用 let窗口：UIWindow？带有窗口？.presentViewController（alert，animated：true，completion：nil），但这没有用，因为这个窗口实际上并不代表任何现有的窗口，无论如何它都不是视图控制器。

You would need to use your let window : UIWindow? with window?.presentViewController(alert, animated: true, completion: nil), but this won't help, since this window does not actually represent any existing window, and it's not a view controller anyway.

所以我建议你将实际的视图控制器传递给方法：

So I suggest you pass the actual view controller you'll be using to the method:

static func showAlertMessage(vc: UIViewController, titleStr:String, messageStr:String) -> Void {
    let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
    vc.presentViewController(alert, animated: true, completion: nil)
}

你从一个UIViewController对象可用的类中调用它。

and you call it from a class where a UIViewController object is available.

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