Swift - 创建代理协议实现页面间参数传递和方法调用

在开发中，经常需要用到协议代理模式。比如，进入编辑页面修改数据后，将新数据回传到主界面。

下面通过一个样例来说明协议代理模式，功能如下：

1，主页面有一个标签和一个修改按钮，点击修改按钮会跳转到编辑页面

2，编辑页面中修改输入框的文字后，点击“确定”则返回主页面，同时主页面的标签值会替换成新值

3，如果点击编辑页面的“取消”按钮则直接返回主页面

效果图如下：

实现过程：

1，首先在storyboard中绘制如下两个界面，同时将主界面的“修改”按钮与编辑页做present modally关联

2，设置这个关联Segue的Identity为 EditView

3，主界面ViewController.swift

 
        @H_403_64@import 
        @H_403_64@UIKit 
       
        @H_403_64@class 
        @H_403_64@ViewController 
        @H_403_64@: 
        @H_403_64@UIViewController 
        @H_403_64@, 
        @H_403_64@EditViewControllerDelegate 
        @H_403_64@{ 
       
        @H_403_64@ 
        @H_403_64@@IBOutlet 
        @H_403_64@weak 
        @H_403_64@var 
        @H_403_64@label: 
        @H_403_64@UILabel 
        @H_403_64@! 
       
        @H_403_64@ 
       
        @H_403_64@ 
        @H_403_64@override 
        @H_403_64@func 
        @H_403_64@viewDidLoad() { 
       
        @H_403_64@ 
        @H_403_64@super 
        @H_403_64@.viewDidLoad() 
       
        @H_403_64@ 
        @H_403_64@// Do any additional setup after loading the view,typically from a nib. 
       
        @H_403_64@} 
       
        @H_403_64@ 
        @H_403_64@override 
        @H_403_64@func 
        @H_403_64@didReceiveMemoryWarning() { 
       
        @H_403_64@ 
        @H_403_64@super 
        @H_403_64@.didReceiveMemoryWarning() 
       
        @H_403_64@ 
        @H_403_64@// Dispose of any resources that can be recreated. 
       
        @H_403_64@} 
       
        @H_403_64@ 
       
        @H_403_64@ 
        @H_403_64@//页面跳转时 
       
        @H_403_64@ 
        @H_403_64@override 
        @H_403_64@func 
        @H_403_64@prepareForSegue(segue: 
        @H_403_64@UIStoryboardSegue 
        @H_403_64@,sender: 
        @H_403_64@AnyObject 
        @H_403_64@?) { 
       
        @H_403_64@ 
        @H_403_64@if 
        @H_403_64@segue.identifier == 
        @H_403_64@"EditView" 
        @H_403_64@{ 
       
        @H_403_64@ 
        @H_403_64@//通过seque的标识获得跳转目标 
       
        @H_403_64@ 
        @H_403_64@let 
        @H_403_64@controller = segue.destinationViewController 
        @H_403_64@as 
        @H_403_64@! 
        @H_403_64@EditViewController 
       
        @H_403_64@ 
        @H_403_64@//设置代理 
       
        @H_403_64@controller.delegate = 
        @H_403_64@self 
       
        @H_403_64@ 
        @H_403_64@//将值传递给新页面 
       
        @H_403_64@controller.oldInfo = label.text 
       
        @H_403_64@} 
       
        @H_403_64@} 
       
        @H_403_64@ 
        @H_403_64@func 
        @H_403_64@editInfo(controller: 
        @H_403_64@EditViewController 
        @H_403_64@,newInfo: 
        @H_403_64@String 
        @H_403_64@){ 
       
        @H_403_64@label.text = newInfo; 
       
        @H_403_64@ 
        @H_403_64@//关闭编辑页面 
       
        @H_403_64@controller.presentingViewController!.dismissViewControllerAnimated( 
        @H_403_64@true 
        @H_403_64@,completion: 
        @H_403_64@nil 
        @H_403_64@) 
       
        @H_403_64@} 
       
       @H_10_301@ 
        @H_403_64@ 
       
        @H_403_64@ 
        @H_403_64@func 
        @H_403_64@editInfoDidCancer(controller: 
        @H_403_64@EditViewController 
        @H_403_64@){ 
       
        @H_403_64@ 
        @H_403_64@//关闭编辑页面 
       
        @H_403_64@controller.presentingViewController!.dismissViewControllerAnimated( 
        @H_403_64@true 
        @H_403_64@,completion: 
        @H_403_64@nil 
        @H_403_64@) 
       
        @H_403_64@} 
       
        @H_403_64@}

4，编辑页 EditViewController.swift

 
        @H_403_64@import 
        @H_403_64@UIKit 
       
        @H_403_64@class 
        @H_403_64@EditViewController 
        @H_403_64@: 
        @H_403_64@UIViewController 
        @H_403_64@{ 
       
        @H_403_64@ 
        @H_403_64@@IBOutlet 
        @H_403_64@weak 
        @H_403_64@var 
        @H_403_64@textField: 
        @H_403_64@UITextField 
        @H_403_64@! 
       
        @H_403_64@ 
       
        @H_403_64@ 
        @H_403_64@var 
        @H_403_64@delegate: 
        @H_403_64@EditViewControllerDelegate 
        @H_403_64@? 
       
        @H_403_64@ 
       
        @H_403_64@ 
        @H_403_64@var 
        @H_403_64@oldInfo: 
        @H_403_64@String 
        @H_403_64@? 
       
        @H_403_64@ 
       
        @H_403_64@ 
        @H_403_64@override 
        @H_403_64@func 
        @H_403_64@viewDidLoad() { 
       
        @H_403_64@ 
        @H_403_64@super 
        @H_403_64@.viewDidLoad() 
       
        @H_403_64@ 
        @H_403_64@// Do any additional setup after loading the view. 
       
        @H_403_64@ 
        @H_403_64@if 
        @H_403_64@oldInfo != 
        @H_403_64@nil 
        @H_403_64@{ 
       
        @H_403_64@textField.text = oldInfo 
       
        @H_403_64@} 
       
        @H_403_64@} 
       
        @H_403_64@ 
        @H_403_64@override 
        @H_403_64@func 
        @H_403_64@didReceiveMemoryWarning() { 
       
        @H_403_64@ 
        @H_403_64@super 
        @H_403_64@.didReceiveMemoryWarning() 
       
        @H_403_64@ 
        @H_403_64@// Dispose of any resources that can be recreated. 
       
        @H_403_64@} 
       
        @H_403_64@ 
        @H_403_64@@IBAction 
        @H_403_64@func 
        @H_403_64@done(sender: 
        @H_403_64@AnyObject 
        @H_403_64@) { 
       
        @H_403_64@delegate?.editInfo( 
        @H_403_64@self 
        @H_403_64@,newInfo: textField.text!) 
       
        @H_403_64@} 
       
        @H_403_64@ 
        @H_403_64@@IBAction 
        @H_403_64@func 
        @H_403_64@cancel(sender: 
        @H_403_64@AnyObject 
        @H_403_64@) { 
       
        @H_403_64@delegate?.editInfoDidCancer( 
        @H_403_64@self 
        @H_403_64@) 
       
        @H_403_64@} 
       
        @H_403_64@}

5，编辑页代理 EditViewControllerDelegate.swift

 
        @H_403_64@protocol 
        @H_403_64@EditViewControllerDelegate 
        @H_403_64@{ 
       
 
        @H_403_64@ 
        @H_403_64@func 
        @H_403_64@editInfo(controller: 
        @H_403_64@EditViewController 
        @H_403_64@,newInfo: 
        @H_403_64@String 
        @H_403_64@) 
       
 
        @H_403_64@ 
        @H_403_64@func 
        @H_403_64@editInfoDidCancer(controller: 
        @H_403_64@EditViewController 
        @H_403_64@) 
       
 
        @H_403_64@} 
       

6，在Storyboard中，将编辑页的Class设为EditViewController

presentedViewController：The view controller that is presented by this view controlller(read-only)，被本视图控制器present出来的的视图控制器

presentingViewController：The view controller that presented this view controller. (read-only)，present出来本视图控制器的视图控制器
如A-->弹出B,则A.presentedViewController = B
B.presentingViewController = A
dismissViewControllerAnimated:YES
Dismisses the view controller that was presented modally by the view controller.
也就是在在A上调该方法，dismiss掉A弹出的vc
如果在B上调，会调用presenting view的该方法，即A的该方法

Swift - 创建代理协议实现页面间参数传递和方法调用

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