swift代理传值

来源：互联网发布：ipad下不了软件编辑：程序博客网时间：2024/04/28 10:14

视图之间传值有几种方式，今天暂时写一下代理传值，后更新

开发平台： mac 10.10.2

编译器：xcode6.3 (6D532l)

运行平台： xcode iphone 5s虚拟机

所谓代理传值，就是通过delegate 来实现。设置两个视图.通过代理把第二张的视图的某值传给第一张视图

UI如图。给第二章视图创建并绑定一个类

在第二个视图类里声明一个协议

因为之前写的是一个测试，所以命名还是有点坑的protocol channelProtocol{    func onChangChannel(channelNumber:Int)}

在第二个视图类里添加协议的代理

var delegate:channelProtocol?

然后即可设置代理所传的值

delegate?.onChangChannel(rowOfTable)  //rowOfTable 之前声明的便变量

第二个视图类的完整代码为

import UIKitimport AVFoundationclass ViewController: UIViewController,channelProtocol {    @IBOutlet weak var label: UILabel!    var audioPlayer : AVAudioPlayer!    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {        var ChanleC:secondView = segue.destinationViewController as! secondView        ChanleC.delegate = self         }    func onChangChannel(channelNumber: Int) {        label.text = "\(channelNumber)"            }}

下面开始写ViewControler 类

加入刚刚在视图二绑定类声明的协议。实现方法

class ViewController: UIViewController,channelProtocol {}

重写 prepareForSegue(segue: UIStoryboardSegue, sender:AnyObject?) 方法，这个也是代理传值的重点

overridce func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {        var ChanleC:secondView = segue.destinationViewController as! secondView        ChanleC.delegate = self         }

实现协议的方法

 func onChangChannel(channelNumber: Int) {        label.text = "\(channelNumber)"            }

ViewController.swift完整代码是

import UIKitclass ViewController: UIViewController,channelProtocol {    @IBOutlet weak var label: UILabel!    var audioPlayer : AVAudioPlayer!    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {        var ChanleC:secondView = segue.destinationViewController as! secondView        ChanleC.delegate = self         }    func onChangChannel(channelNumber: Int) {        label.text = "\(channelNumber)"            }}

完整项目代码托管到coding https://coding.net/goooooooofy/delegateGetValue.git

更多文章。访问个人网站 http://www.goofy.ga

0 0