如何向 UIAlertController 添加操作并获取操作结果 (Swift)

Question

我想设置一个 UIAlertController 有四个操作按钮，按钮的标题设置为 "hearts"、"spades"、"diamonds" 和"clubs"。当按下一个按钮时，我想 return 它的标题。

简而言之，这是我的计划：

// TODO: Create a new alert controller

for i in ["hearts", "spades", "diamonds", "clubs"] {

    // TODO: Add action button to alert controller

    // TODO: Set title of button to i

}

// TODO: return currentTitle() of action button that was clicked

Answer 1

这是一个示例代码，其中包含两个操作 plus 和 ok-action：

import UIKit

// The UIAlertControllerStyle ActionSheet is used when there are more than one button.
@IBAction func moreActionsButtonPressed(sender: UIButton) {
    let otherAlert = UIAlertController(title: "Multiple Actions", message: "The alert has more than one action which means more than one button.", preferredStyle: UIAlertControllerStyle.ActionSheet)

    let printSomething = UIAlertAction(title: "Print", style: UIAlertActionStyle.Default) { _ in
        print("We can run a block of code." )
    }

    let callFunction = UIAlertAction(title: "Call Function", style: UIAlertActionStyle.Destructive, handler: myHandler)

    let dismiss = UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: nil)

    // relate actions to controllers
    otherAlert.addAction(printSomething)
    otherAlert.addAction(callFunction)
    otherAlert.addAction(dismiss)

    presentViewController(otherAlert, animated: true, completion: nil)
}

func myHandler(alert: UIAlertAction){
    print("You tapped: \(alert.title)")
}}

与即handler: myHandler 你定义一个函数，来读取结果 让 printSomething.

这只是一种方式;-)

有问题吗？

Answer 2

试试这个：

let alert = UIAlertController(title: "Alert Title", message: "Alert Message", style = .Alert)
for i in ["hearts", "spades", "diamonds", "hearts"] {
    alert.addAction(UIAlertAction(title: i, style: .Default, handler: doSomething)
}
self.presentViewController(alert, animated: true, completion: nil)

并在此处处理操作：

func doSomething(action: UIAlertAction) {
    //Use action.title
}

为了将来参考，您应该看看 Apple's Documentation on UIAlertControllers

如何向 UIAlertController 添加操作并获取操作结果 (Swift)

How to add actions to UIAlertController and get result of actions (Swift)

xcode

ios

swift

uialertcontroller