swift的protocol

概述新建一个Protocol.swift文件 里面的内容 为  import Foundation protocol ChangeTextDelegate{     func changeLableValue(newString:String)      } class OtherVC: UIViewController {          var delegate : ChangeTextDele 新建一个Protocol.swift文件 里面的内容 为

import Foundation

protocol ChangeTextDelegate{

func changeLableValue(newString:String)

}

class OtherVC: UIVIEwController {

var delegate : ChangeTextDelegate?

overrIDe func vIEwDIDLoad() {

super.vIEwDIDLoad()

// Do any additional setup after loading the vIEw.

}

overrIDe func dIDReceiveMemoryWarning() {

super.dIDReceiveMemoryWarning()

// dispose of any resources that can be recreated.

@IBAction func otherbuttonClick(sender: UIbutton) {

delegate!.changeLableValue("这是第二个")

self.dismissVIEwControllerAnimated(true) { () -> VoID in

}

class VIEwController: UIVIEwController,ChangeTextDelegate {

func changeLableValue(newString: String) {

lable.text=newString

@IBOutlet weak var lable: UILabel!

@IBOutlet weak var btnClick: UIbutton!

@IBAction func buttonClick(sender: UIbutton) {

let storyBoard = UIStoryboard(name: "Main",bundle: nil)

let otherVc :OtherVC = storyBoard.instantiateVIEwControllerWithIDentifIEr("OtherVC") as! OtherVC

otherVc.delegate=self

self.presentVIEwController(otherVc,animated: true) { () -> VoID in

}

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