Swift开发：弹框（UIAlertController）

概述

黄色圆圈代表属性；绿色勾号代表方法。



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代码示例

[objc] view plaincopy




import UIKit

class ViewController: UIViewController {

var alert1: UIAlertController!

var alert2: UIAlertController!

var actionSheet: UIAlertController!

override func viewDidLoad() {

// 定义一个按钮，显示最简单的 Alert

let button1 = UIButton.buttonWithType(.System) as UIButton

button1.frame = CGRectMake(self.view.frame.width/2 - 200, 50, 400, 50)

button1.setTitle("最简单的 Alert", forState: UIControlState.Normal)

button1.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

button1.tag = 1

// 定义一个按钮，显示带文本框的 Alert

let button2 = UIButton.buttonWithType(.System) as UIButton

button2.frame = CGRectMake(self.view.frame.width/2 - 200, 150, 400, 50)

button2.setTitle("带文本框的 Alert", forState: UIControlState.Normal)

button2.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

button2.tag = 2

// 定义一个按钮，显示上拉菜单

let button3 = UIButton.buttonWithType(.System) as UIButton

button3.frame = CGRectMake(self.view.frame.width/2 - 200, 250, 400, 50)

button3.setTitle("上拉菜单", forState: UIControlState.Normal)

button3.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

button3.tag = 3

// 定义 cancel、ok、save、delete、reset 的 UIAlertAction

var cancelAction = UIAlertAction(title: "cancel", style: UIAlertActionStyle.Cancel, handler: nil)

var okAction = UIAlertAction(title: "ok", style: UIAlertActionStyle.Default){

(action: UIAlertAction!) -> Void in

println("you choose ok")

}

var saveAction = UIAlertAction(title: "save", style: UIAlertActionStyle.Default){

(action: UIAlertAction!) -> Void in

println("you choose save")

}

var deleteAction = UIAlertAction(title: "delete", style: UIAlertActionStyle.Destructive){

(action: UIAlertAction!) -> Void in

println("you choose delete")

}

var resetAction = UIAlertAction(title: "reset", style: UIAlertActionStyle.Destructive){

(action: UIAlertAction!) -> Void in

println("you choose reset")

}

// 1、初始化最简单的 Alert

alert1 = UIAlertController(title: "simple alert", message: "this is a simple alert", preferredStyle: UIAlertControllerStyle.Alert)

alert1.addAction(cancelAction)

alert1.addAction(resetAction)

alert1.addAction(okAction)

// 2、初始化带文本框的 Alert

alert2 = UIAlertController(title: "login alert", message: "please enter your name and password", preferredStyle: UIAlertControllerStyle.Alert)

alert2.addTextFieldWithConfigurationHandler {

(textField: UITextField!) -> Void in

textField.placeholder = "name"

}

alert2.addTextFieldWithConfigurationHandler {

(textField: UITextField!) -> Void in

textField.placeholder = "password"

textField.secureTextEntry = true

}

var loginAction = UIAlertAction(title: "login", style: UIAlertActionStyle.Default) {

(action: UIAlertAction!) -> Void in

var name = self.alert2.textFields!.first as UITextField

var password = self.alert2.textFields!.last as UITextField

println("name : \(name.text); password : \(password.text)")

}

alert2.addAction(loginAction)

// 3、初始化上拉菜单

actionSheet = UIAlertController(title: "simple action sheet", message: "action sheet message", preferredStyle: UIAlertControllerStyle.ActionSheet)

actionSheet.addAction(cancelAction)

actionSheet.addAction(deleteAction)

actionSheet.addAction(saveAction)

self.view.addSubview(button1)

self.view.addSubview(button2)

self.view.addSubview(button3)

self.view.addSubview(button3)

}

/// 按钮响应事件

func buttonAction(sender: UIButton) {

let num = sender.tag

switch num {

case 1:

self.presentViewController(alert1, animated: true, completion: nil)

case 2:

self.presentViewController(alert2, animated: true, completion: nil)

case 3:

self.presentViewController(actionSheet, animated: true, completion: nil)

default:

break

}

}

}

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结果展示



//官方地址
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIAlertController_class/index.html#//apple_ref/doc/uid/TP40014538-CH1-SW2