swift基础利用闭包在两个视图界面传值

概述视图ViewController  class ViewController: UIViewController{ @IBOutlet weak var valueLabel: UILabel! var secVC:SecondController = SecondController() override func viewDidLoad(

视图VIEwController

class VIEwController: UIVIEwController{        @IBOutlet weak var valueLabel: UILabel!            var secVC:SecondController = SecondController()    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()                secVC.myClosure = {(text:String) -> VoID in                    print("\(text)")            self.valueLabel.text = text        }    }        @IBAction func push() {                self.navigationController?.pushVIEwController(secVC,animated: true)                    }}

视图二

import UIKit// 闭包typealias sendValueClosure = (text:String)->VoIDclass SecondController: UIVIEwController {    var myClosure:sendValueClosure?        var textFIEld: UITextFIEld!    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        self.vIEw.backgroundcolor = UIcolor.redcolor()        textFIEld = UITextFIEld(frame: CGRectMake(30,100,260,30))        textFIEld.borderStyle = UITextborderStyle.RoundedRect        self.vIEw.addSubvIEw(textFIEld)              let btn = UIbutton(frame: CGRectMake(30,150,30))        btn.setTitle("click",forState: UIControlState.normal)        btn.addTarget(self,action: #selector(SecondController.click),forControlEvents: UIControlEvents.touchUpInsIDe)        self.vIEw.addSubvIEw(btn)    }        // 点击这里传值过去    func click() {        let str:String = textFIEld.text!                if (myClosure != nil){            myClosure!(text:str)        }                self.navigationController?.popVIEwControllerAnimated(true)               }}

当点击click 运行结果为 总结

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