import UIKit

class ViewController: UIViewController,TestDelegatePassValueDelegate {

    @IBOutlet weak var TFContent: UITextField!

    override func viewDidLoad() {

        super.viewDidLoad()

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

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    @IBAction func delegateOrBlockBtnClick(sender: AnyObject) {

        TFContent.text = ""

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

        let testVCtl = storyBoard.instantiateViewControllerWithIdentifier("TestDelegateOrBlockViewController") as!TestDelegateOrBlockViewController;

        /**设置代理*/

        testVCtl.delegate = self

        /**block回调传值*/

        testVCtl.passValueUseBlock { (valueString) -> Void in

            self.TFContent!.text = valueString  as String

        }

        self.navigationController!.pushViewController(testVCtl, animated: true);

    }

    /**代理函数*/

    func passValueUseDelegate(valueString: NSString)

    {

        self.TFContent!.text = valueString as String

    }

}

import UIKit

import Foundation

/**定义一个block*/

typealias TestBlockCompleteHandler = (valueString: NSString)->Void

/**声明定义协议*/

protocol TestDelegatePassValueDelegate:NSObjectProtocol

{

    func passValueUseDelegate(valueString: NSString)

}

class TestDelegateOrBlockViewController: UIViewController

{

    @IBOutlet weak var TFContent: UITextField!

    var delegate:TestDelegatePassValueDelegate?

    var myBlockHandler:TestBlockCompleteHandler?

    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: - 用代理来实现传值

    @IBAction func delegateBtnClick(sender: AnyObject)

    {

         TFContent.resignFirstResponder()

        if ((delegate != nil) && (delegate?.respondsToSelector("passValueUseDelegate:") != nil))

        {

          delegate?.passValueUseDelegate(TFContent.text!)

        }

        self.navigationController?.popViewControllerAnimated(true)

    }

    //MARK: - 用block来实现传值

    @IBAction func blockBtnClick(sender: AnyObject)

    {

        TFContent.resignFirstResponder()

        myBlockHandler?(valueString: self.TFContent.text!)

        self.navigationController?.popViewControllerAnimated(true)

    }

    func passValueUseBlock(blockHandler: TestBlockCompleteHandler)

    {

      myBlockHandler = blockHandler

    }