我将如何在 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，因为我收到此错误:

<块引用>

找不到接受提供的init"的重载论据

我是这样写的:

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

然后称之为我正在使用的:

button2Alert.show()

截至目前，它正在崩溃，我似乎无法正确使用语法.

解决方案

来自 UIAlertView 类:

<块引用>

//UIAlertView 已弃用.将 UIAlertController 与优选样式为 UIAlertControllerStyleAlert 代替

在 iOS 8 上，您可以这样做:

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

现在 UIAlertController 是一个单一的类，用于在 iOS 8 上创建我们所知的 UIAlertViews 和 UIActionSheets 并与之交互.>

处理动作:

alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action in切换动作样式{案例.默认:打印(默认")案例.取消:打印(取消")案例.破坏性:打印(破坏性")}}}))

针对 Swift 3 进行

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

针对 Swift 4.x 进行

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: .alert)alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in切换动作样式{案例.默认:打印(默认")案例.取消:打印(取消")案例.破坏性:打印(破坏性")}}))self.present(警报，动画:true，完成:nil)

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:

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

Here is how I have it written:

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

Then to call it I'm using:

button2Alert.show()

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

解决方案

From the UIAlertView class:

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

On iOS 8, you can do this:

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)

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

Edit: To handle actions:

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")
    }
}}))

Edit for Swift 3:

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)

Edit for Swift 4.x:

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: .alert)
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")
        
    }
}))
self.present(alert, animated: true, completion: nil)

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