【swift_4】swift之代理传值(delegate的用法)

概述具体的代码，详见Demo：链接: http://pan.baidu.com/s/1gdkyWE3 密码: 4mhv rootViewController class ViewController: UIViewController,GetMessageDelegate{ var _button:UIButton? var _label:UILabel? override

具体的代码，详见Demo：链接: http://pan.baidu.com/s/1gdkyWE3 密码: 4mhv

rootVIEwController

class VIEwController: UIVIEwController,GetMessageDelegate{    var _button:UIbutton?    var _label:UILabel?    overrIDe func vIEwDIDLoad()    {        super.vIEwDIDLoad()                self.Title = "RootVIEwController"        //创建label 用来接收传过来的值        _label = UILabel(frame: CGRect(x: 50,y: 100,wIDth: 220,height: 44))        _label?.text = "get message from next page"                _label?.textAlignment = NSTextAlignment.Center        _label?.backgroundcolor = UIcolor.cyancolor()        self.vIEw.addSubvIEw(_label!)                //创建button 点击跳转到下一个界面        _button = UIbutton(frame:CGRect(x:60,y:200,wIDth:200,height:44))        _button?.setTitle("go to next page",forState: UIControlState.normal)        _button?.setTitlecolor(UIcolor.yellowcolor(),forState: UIControlState.normal)        _button?.backgroundcolor = UIcolor.bluecolor()        _button?.addTarget(self,action: "nextPage",forControlEvents: UIControlEvents.touchUpInsIDe)        self.vIEw.addSubvIEw(_button!)    }    //push    func nextPage()    {        let nextVC = NextVIEwController()        //指定代理        nextVC.delegate = self        self.navigationController!.pushVIEwController(nextVC,animated:true)    }    //接收传过来的值    func getMessage(controller:NextVIEwController,string:String)    {        _label?.text = string        if(string == "")        {            _label?.text = "null"        }     }}

secondVIEwController

//创建协议protocol GetMessageDelegate:NSObjectProtocol{    //回调方法 传一个String类型的值    func getMessage(controller:NextVIEwController,string:String)}class NextVIEwController: UIVIEwController{    var delegate:GetMessageDelegate?    var _textFIEld:UITextFIEld?    overrIDe func vIEwDIDLoad()    {        super.vIEwDIDLoad()        self.Title = "SecondVIEwController"        self.vIEw.backgroundcolor = UIcolor.whitecolor()                //创建textFIEld 用来输入要传的值        _textFIEld = UITextFIEld(frame: CGRect(x: 60,wIDth: 200,height: 44))        _textFIEld?.borderStyle = UITextborderStyle.RoundedRect        _textFIEld?.placeholder = "input sth to send back"        self.vIEw.addSubvIEw(_textFIEld!)        //创建返回的button        var mybutton = UIbutton(frame:CGRect(x:60,height:44))        mybutton.center = CGPointMake(160,200)        mybutton.setTitle("send message back",forState:.normal)        mybutton.addTarget(self,action:"goBack",forControlEvents:.touchUpInsIDe)        mybutton.backgroundcolor = UIcolor.bluecolor()        self.vIEw.addSubvIEw(mybutton)    }    func goBack()    {        //调用代理方法        if((delegate) != nil)        {            delegate?.getMessage(self,string:_textFIEld!.text)            self.navigationController?.popToRootVIEwControllerAnimated(true)        }            }}

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