ios 如何向 UIAlertController 添加操作并获取操作结果 (Swift)
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How to add actions to UIAlertController and get result of actions (Swift)
提问by Abhi V
I want to set up a UIAlertControllerwith four action buttons, and the titles of the buttons to be set to "hearts", "spades", "diamonds", and "clubs". When a button is pressed, I want to return its title.
我想设置一个UIAlertController带有四个动作按钮的按钮，按钮的标题设置为“红心”、“黑桃”、“钻石”和“俱乐部”。当按下按钮时，我想返回其标题。
In short, here is my plan:
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
回答by Pranav Wadhwa
Try this:
尝试这个：
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)
And handle the action here:
并在此处处理操作：
func doSomething(action: UIAlertAction) {
//Use action.title
}
For future reference, you should take a look at Apple's Documentation on UIAlertControllers
为了将来参考，您应该查看Apple 在 UIAlertControllers 上的文档
回答by Ulli H
here′s a sample code with two actions plus and ok-action:
这是带有两个动作 plus 和 ok-action 的示例代码：
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)")
}}
with i.E. handler: myHandleryou define a function, to read the result of the let printSomething.
使用 iE handler: myHandler定义一个函数，以读取let printSomething的结果。
This is just oneway ;-)
这只是一种方式;-)
Any questions?
任何问题？
