swift-delegate(代理)或者block传值

1:delegate或者block传值

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
    
    }