swift传值：利用代理(delegate)和闭包(closure)

swift使用delegate和closure进行传值：类似oc的代理和block

firstViewController.swift文件

//

//  firstViewController.swift

//  testPageControl

//

//  Created by yinlinlin on 15/12/29.

//  Copyright © 2015年 yinlinlin. All rights reserved.

//

import UIKit

class firstViewController:UIViewController,passValueDelegate {

    var passValueLabel:UILabel!

    override func viewDidLoad() {

        super.viewDidLoad()

        self.view.backgroundColor =UIColor.whiteColor()

        let pushBtn =UIButton(type: .Custom)

        pushBtn.frame =CGRectMake(100,150, kMainScreenWidth -200, 40)

        pushBtn.setTitle("secondCon", forState: .Normal)

        self.view.addSubview(pushBtn)

        pushBtn.addTarget(self, action:Selector("pushTosecondViewController"), forControlEvents: .TouchUpInside)

        pushBtn.setTitleColor(UIColor.redColor(), forState: .Normal)

        passValueLabel =UILabel.init(frame:CGRectMake(20,100, kMainScreenWidth -40, 30))

        passValueLabel.backgroundColor =UIColor.grayColor()

        self.view.addSubview(passValueLabel)

        

        // Do any additional setup after loading the view.

    }

    func pushTosecondViewController() {

        let secondCon =secondViewController()

        

        //利用闭包传值：跟oc的block很像

        secondCon.myClosure = {

            [unowned self](newValue:AnyObject) ->Void

            in

            self.passValueLabel.text = newValueas? String

        }

        secondCon.delegate =self

        

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

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    

//MARK: - passValueDelegate代理回调

    func passValue(newValue:AnyObject) {

        print("接收代理回调的值:\(newValue)")

        passValueLabel.text = newValueas? String

    }

    /*

    // 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.

    }

    */

}

secondViewController.swift文件

//

//  secondViewController.swift

//  testPageControl

//

//  Created by yinlinlin on 15/12/29.

//  Copyright © 2015年 yinlinlin. All rights reserved.

//

import UIKit

//利用代理传值

protocol passValueDelegate:NSObjectProtocol {

    

    func passValue(newValue:AnyObject)

}

//闭包回调传值

typealias sendValueClosure = (newValue:AnyObject) ->Void

class secondViewController: UIViewController {

    var myClosure:sendValueClosure?

    weakvar delegate:passValueDelegate?

    var textField:UITextField!

    override func viewDidLoad() {

        super.viewDidLoad()

        self.view.backgroundColor =UIColor.whiteColor()

        textField = UITextField.init(frame: CGRectMake(20, 100, kMainScreenWidth - 40, 30))

        textField.backgroundColor =UIColor.yellowColor()

        textField.placeholder ="输入newValue"

        self.view.addSubview(textField)

        

        let delegateBtn = UIButton(type: .Custom)

        delegateBtn.frame = CGRectMake(20, 150, kMainScreenWidth/2.0 -40, 40)

        delegateBtn.setTitleColor(UIColor.redColor(), forState: .Normal)

        delegateBtn.setTitle("delegate传值", forState: .Normal)

        self.view.addSubview(delegateBtn)

        delegateBtn.addTarget(self, action:Selector("delegatePassValueBtnPressed"), forControlEvents: .TouchUpInside)

        

        let closureBtn = UIButton(type: .Custom)

        closureBtn.frame = CGRectMake(kMainScreenWidth/2.0+20,150, kMainScreenWidth/2.0 -40, 40)

        closureBtn.setTitle("闭包传值", forState: .Normal)

        closureBtn.setTitleColor(UIColor.redColor(), forState: .Normal)

        self.view.addSubview(closureBtn)

        closureBtn.addTarget(self, action:Selector("closurePassValueBtnPressed"), forControlEvents: .TouchUpInside)

        // Do any additional setup after loading the view.

    }

    //MARK: - 代理传值

    func delegatePassValueBtnPressed(){

        delegate?.passValue(textField.text!)

        self.navigationController?.popViewControllerAnimated(true)

    }

    //MARK: - 闭包传值

    func closurePassValueBtnPressed(){

        if myClosure !=nil {

            myClosure!(newValue: textField.text!)

        }

        self.navigationController?.popViewControllerAnimated(true)

    }

    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.

    }

    */

}