swift代理传值的实现

//委托

import UIKit

protocol ValuePassDelegaete:NSObjectProtocol{

func passValue(value:String)

}

class ViewController2: UIViewController {

var delegate:ValuePassDelegaete?

@IBOutlet weak var valuelab: UILabel!

@IBAction func Back(sender: UIButton) {

self.delegate!.passValue("123")

}

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.

}

/*

// MARK: - Navigation

// In a storyboard-based application,you will often want to do a little preparation before navigation

override func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?) {

// Get the new view controller using segue.destinationViewController.

// Pass the selected object to the new view controller.

}

*/

}

//代理

import UIKit

class ViewController1: UIViewController,ValuePassDelegaete {

@IBOutlet weak var valueLab: UILabel!

@IBAction func Click(sender: UIButton) {

let view2 = ViewController2(nibName:"ViewController2",bundle:nil)

view2.delegate = self

self.navigationController?.pushViewController(view2,animated: true)

}

func passValue(value: String) {

self.valueLab.text = value

}

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view.

}

override func didReceiveMemoryWarning() {

*/

}

（编辑：李大同）

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