iOS 閉包傳值 和 代理傳值

標籤：push   control   閉包傳值   tom   let   touch   tor   ase   app   

        let vc = ViewController()

        let navc = UINavigationController(rootViewController: vc)

        

        window = UIWindow(frame: UIScreen.mainScreen().bounds)

        window?.backgroundColor = UIColor.whiteColor()

        window?.rootViewController = navc

        window?.makeKeyAndVisible()

        // Override point for customization after application launch.

        return true

 

 

 

import UIKit

 

class ViewController: UIViewController {

 

    override func viewDidLoad() {

        super.viewDidLoad()

        let btn = UIButton(frame: CGRectMake(50, 100, 60, 60))

        btn.setTitle("下一頁", forState: UIControlState.Normal)

        btn.backgroundColor = UIColor.redColor()

        btn.addTarget(self, action: "pushToSecondVC", forControlEvents: UIControlEvents.TouchUpInside)

        view.addSubview(btn)

 

        // Do any additional setup after loading the view, typically from a nib.

    }

    func pushToSecondVC(){

        let secondVC = SecondViewController()

        secondVC.closure = {

            (color:UIColor)->Void

            in

            self.view.backgroundColor = color

        }

        navigationController?.pushViewController(secondVC, animated: true)

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

 

 

}

 

import UIKit

 

class SecondViewController: UIViewController {

    var closure:((color:UIColor)->Void)?

    override func viewDidLoad() {

        view.backgroundColor = UIColor.cyanColor()

        super.viewDidLoad()

        let btn = UIButton(frame: CGRectMake(50, 100, 60, 60))

        btn.setTitle("上一頁", forState: UIControlState.Normal)

        btn.backgroundColor = UIColor.redColor()

        btn.addTarget(self, action: "popToFirstVC", forControlEvents: UIControlEvents.TouchUpInside)

        view.addSubview(btn)

        // Do any additional setup after loading the view.

    }

 

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    func popToFirstVC(){

        let greenColor = UIColor.greenColor()

        closure!(color:greenColor)

        navigationController?.popViewControllerAnimated(true)

    }

 

    /*

    // 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.

    }

    */

 

}

iOS 閉包傳值 和 代理傳值