如何在Swift中创建UIAlertView？ [英] How would I create a UIAlertView in Swift?

问题描述

我一直在努力在Swift中创建一个UIAlertView，但由于某种原因，我无法得到正确的语句，因为我得到这个错误：

I have been working to create a UIAlertView in Swift, but for some reason I can't get the statement right because I'm getting this error:

无法为接受所提供的
参数的'init'找到重载

Could not find an overload for 'init' that accepts the supplied arguments

我写了：

let button2Alert: UIAlertView = UIAlertView(title: "Title", message: "message",
                     delegate: self, cancelButtonTitle: "Ok", otherButtonTitles: nil)

使用：

button2Alert.show()

因为现在它崩溃，我似乎不能得到正确的语法。

As of right now it is crashing and I just can't seem to get the syntax right.

推荐答案

从 UIAlertView 类：

// UIAlertView已弃用。使用 UIAlertController 替换UIAlertControllerStyleAlert的
preferredStyle

// UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead

在iOS 8上， ：

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

现在 UIAlertController 是一个单独的类，用于创建和交互我们所知道的 UIAlertView s和 UIActionSheet 在iOS 8上。

Now UIAlertController is a single class for creating and interacting with what we knew as UIAlertViews and UIActionSheets on iOS 8.

修改：处理操作：

alert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { action in
    switch action.style{
    case .Default:
        print("default")

    case .Cancel:
        print("cancel")

    case .Destructive:
        print("destructive")
    }
}))

为Swift 3编辑：

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)

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