import UIKit class FirstViewController: UIViewController, SecondViewControllerDelegate { @IBOutlet weak var showTextLabel: UILabel! @IBOutlet weak var showDelegateTextLabel: UILabel! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. } //点击按钮跳转到SecondViewController @IBAction func tapGoSecondViewController(sender: UIButton) { //从storyboard上加载SecondViewController let secondVC = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("secondViewController") as! SecondViewController //实现回调，获取回调回来的值 （闭包） secondVC.backClosure = { (backStr: String) -> Void in self.showTextLabel.text = backStr } secondVC.delegate = self //跳转到SecondViewController self.navigationController?.pushViewController(secondVC, animated: true) } //MARK: - SecondViewControllerDelegate(代理) func fetchBackString(str: String) { self.showDelegateTextLabel.text = str } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }
import UIKit
//定义闭包类型（特定的函数类型函数类型）
typealias InputClosureType = (String) -> Void
protocol SecondViewControllerDelegate: NSObjectProtocol{
func fetchBackString(str: String)
}
class SecondViewController: UIViewController {
@IBOutlet weak var inputTextField: UITextField!
//接收上个页面传过来的闭包块
var backClosure: InputClosureType?
weak var delegate: SecondViewControllerDelegate?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
@IBAction func tapBackButton(sender: UIButton) {
if self.backClosure != nil {
if let tempString = self.inputTextField.text {
self.backClosure!(tempString)
}
}
self.navigationController?.popViewControllerAnimated(true)
}
@IBAction func delegateBackMethod(sender: UIButton) {
if self.delegate != nil {
if let tempString = self.inputTextField.text {
delegate!.fetchBackString("代理返回数据:\(tempString)")
}
}
self.navigationController?.popViewControllerAnimated(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
原文：http://www.cnblogs.com/xilanglang/p/5149840.html