正所谓一法通,万法皆通,具体什么意思,你们自己领悟吧。
闭包我想不用多介绍了吧,学过OC的都应该知道,其功能和OC里的Block一样,和通知,在功能上也有相同之处。
先看个界面效果图,用通知也能做出来。我在上面一篇将通知的,也是写的这个功能。
//
// ViewController.swift
// Swift闭包的用法
//
// Created by mac on 16/2/5.
// Copyright © 2016年 ZY. All rights reserved.
//import UIKitclass ViewController: UIViewController {@IBOutlet weak var textF: UITextField!@IBOutlet weak var pushButtonAction: UIButton!override func viewDidLoad() {super.viewDidLoad()pushButtonAction.addTarget(self, action:"pushButtonAction1:", forControlEvents: UIControlEvents.TouchUpInside);}func pushButtonAction1(btn:UIButton){let viewC = SeconViewController(nibName:"SeconViewController",bundle: nil) as SeconViewController;// 参数回调viewC.textback { (text) -> Void inself.textF.text = text as String;};self.presentViewController(viewC, animated: true, completion: { () -> Void in});
// let a = 25;
// print("\(a)");}}
//
// SeconViewController.swift
// Swift闭包的用法
//
// Created by mac on 16/2/5.
// Copyright © 2016年 ZY. All rights reserved.
//import UIKitclass SeconViewController: UIViewController {@IBOutlet weak var textF: UITextField!@IBOutlet weak var button: UIButton!typealias newFuncy = (text : NSString) -> Void;var _myFuncy = newFuncy?();override func viewDidLoad() {super.viewDidLoad()button.addTarget(self, action:"pushButtonAction1:", forControlEvents: UIControlEvents.TouchUpInside);}
// 闭包值的传递方法func textback(mathFunction:(text : NSString) -> Void){_myFuncy = mathFunction;}func pushButtonAction1(btn:UIButton){if((_myFuncy) != nil){
// 调用闭包_myFuncy!(text: textF.text!);}self.dismissViewControllerAnimated(true) { () -> Void in};}//扩展方面
// 闭包的另类用法,用于接口调用func dataBack(str:String , mathFunction:(text:String) -> Void){print("\(str)");let newText = "erwdd";mathFunction(text: newText);}// 类方法class func ushButtonAc(){}}