iOS 页面间几种传值方式(属性,代理,block,单例,通知)
2015-06-26 11:19
477 查看
第二个视图控制器如何获取第一个视图控制器的部分信息
例如 :第二个界面中的lable显示第一个界面textField中的文本
这就需要用到属性传值、block传值那么第一个视图控制器如何获的第二个视图控制器的部分信息
例如:第一个界面中的lable显示第二个界面textField中的文本
这就需要使用代理传值
页面间传值有八大传值方式,下面我们就简单介绍下页面间常用的五种传值方式:
(一)属性传值
第二个界面中的lable显示第一个界面textField中的文本首先我们建立一个RootViewControllers和一个DetailViewControllers,在DetailViewControllers中声明一个textString属性,用于接收传过来的字符串,
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/ce193b8c2da0916b4f6819f586eb4a24.png)
同时创建一个Lable用来显示传过的字符串
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/d748981001204faf0e5fab4f2293bf91.png)
在RootViewControllers上引入DetailViewControllers同时声明一个textField属性用来输入字符串
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/105d14fdda81f391b6da1055b8e70a24.png)
然后在RootViewControllers上我们创建并添加一个button,当点击button时响应相应方法进行视图间的切换完成视图间的传值
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/b564c19667876581411fb66eab1e5a28.png)
(二)Block传值
block传值也是从第二个界面给第一个界面传值首先我们在DetailViewcontrollers的.h文件中,属性
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/f2141d671d7d195c277179d5c2987ae1.png)
在RootViewControllers的.m文件中,其他不变,在button的响应方法里我们为block属性赋值完成block传值
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/384106d3a22f04767b1fb44d88105e29.png)
(三)代理传值
RootViewControllers页面push到DetailViewControllers页面,如果DetailViewControllers页面的信息想回传(回调)到RootViewControllers页面,用代理传值,其中DetailViewControllers定义协议和声明代理,RootViewControllers确认并实现代理,RootViewControllers作为DetailViewControllers的代理首先在DetailViewControllers.h文件中我们创建协议方法
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/ced8a706ac068af47f87ee31731c9a33.png)
在DetailViewControllers的.m中我们判定代理对象存在时,为其绑定相应方法
![](http://blog.csdn.net/mrsunhr/article/details/http:/<br/>ed66<br/>/images.cnitblog.com/blog2015/741774/201505/021805540526233.png)
RootViewControllers的.m文件中我们指定代理并让其执行代理的方法
![](https://oscdn.geek-share.com/Uploads/Images/Content/202001/25/cf4efae1c5ed398422833d6e02fe6299.png)
(四)单例传值
单例传值(实现共享)
AppStatus.h 创建一个单例类 AppStatus
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import <Foundation/Foundation.h> 2 3 @interface AppStatus : NSObject 4 { 5 NSString *_contextStr; 6 } 7 8 @property(nonatomic,retain)NSString *contextStr; 9 10 +(AppStatus *)shareInstance; 11 12 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
AppStatus.m
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import "AppStatus.h" 2 3 @implementation AppStatus 4 5 @synthesize contextStr = _contextStr; 6 7 static AppStatus *_instance = nil; 8 9 +(AppStatus *)shareInstance 10 { 11 if (_instance == nil) 12 { 13 _instance = [[super alloc]init]; 14 } 15 return _instance; 16 } 17 18 -(id)init 19 { 20 if (self = [super init]) 21 { 22 23 } 24 return self; 25 } 26 27 -(void)dealloc 28 { 29 [super dealloc]; 30 } 31 32 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
RootViewController.h
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import "RootViewController.h" 2 #import "DetailViewController.h" 3 #import "AppStatus.h" 4 5 @interface RootViewController () 6 7 @end 8 9 @implementation RootViewController 10 11 -(void)loadView 12 { 13 //核心代码 14 UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 15 btn.frame = CGRectMake(0, 0, 100, 30); 16 [btn setTitle:@"Push" forState:0]; 17 [btn addTarget:self action:@selector(pushAction:) forControlEvents:UIControlEventTouchUpInside]; 18 [self.view addSubview:btn]; 19 } 20 21 -(void)pushAction:(id)sender 22 { 23 tf = (UITextField *)[self.view viewWithTag:1000]; 24 25 //单例传值 将要传递的信息存入单例中(共享中) 26 // [[AppStatus shareInstance]setContextStr:tf.text]; 跟下面这种写法是等价的 27 [AppStatus shareInstance].contextStr = tf.text; 28 //导航push到下一个页面 29 //pushViewController 入栈引用计数+1,且控制权归系统 30 DetailViewController *detailViewController = [[DetailViewController alloc]init]; 31 32 //导航push到下一个页面 33 [self.navigationController pushViewController:detailViewController animated:YES]; 34 [detailViewController release]; 35 } 36 37 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
DetailViewController.h
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import <UIKit/UIKit.h> 2 @protocol ChangeDelegate;//通知编译器有此代理 3 4 @interface DetailViewController : UIViewController 5 { 6 UITextField *textField; 7 } 8 9 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
DetailViewController.m
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import "DetailViewController.h" 2 #import "AppStatus.h" 3 4 @interface DetailViewController () 5 6 @end 7 8 @implementation DetailViewController 9 10 @synthesize naviTitle = _naviTitle; 11 12 -(void)loadView 13 { 14 self.view = [[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]autorelease]; 15 16 //单例 17 self.title = [AppStatus shareInstance].contextStr; 18 textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 150, 30)]; 19 textField.borderStyle = UITextBorderStyleLine; 20 [self.view addSubview:textField]; 21 [textField release]; 22 23 UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDonetarget:self action:@selector(doneAction:)]; 24 self.navigationItem.rightBarButtonItem = doneItem; 25 [doneItem release]; 26 } 27 28 //这个方法是执行多遍的 相当于刷新view 29 -(void)viewWillAppear:(BOOL)animated 30 { 31 [super viewWillAppear:animated]; 32 tf = (UITextField *)[self.view viewWithTag:1000]; 33 tf.text = [AppStatus shareInstance].contextStr; 34 } 35 36 //pop回前一个页面 37 -(void)doneAction:(id)sender 38 { 39 //单例传值 40 [AppStatus shareInstance].contextStr = textField.text; 41 [self.navigationController popToRootViewControllerAnimated:YES]; 42 }
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
(五)通知传值
谁要监听值的变化,谁就注册通知 特别要注意,通知的接受者必须存在这一先决条件A页面RootViewController.h
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import <UIKit/UIKit.h> 2 #import "DetailViewController.h" 3 @interface RootViewController : UIViewController<ChangeDelegate> 4 { 5 UITextField *tf; 6 } 7 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
A页面RootViewController.m
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import "IndexViewController.h" 2 #import "DetailViewController.h" 3 #import "AppStatus.h" 4 5 @implementation IndexViewController 6 7 -(void)dealloc 8 { 9 [[NSNotificationCenter defaultCenter] removeObserver:self 10 name:@"CHANGE_TITLE" object:nil]; 11 [super dealloc]; 12 } 13 14 -(id)init 15 { 16 if (self = [super init]) 17 { 18 [[NSNotificationCenter defaultCenter] addObserver:self 19 selector:@selector(change:) 20 name:@"CHANGE_TITLE" 21 object:nil]; 22 } 23 return self; 24 } 25 26 -(void)change:(NSNotification *)aNoti 27 { 28 // 通知传值 29 NSDictionary *dic = [aNoti userInfo]; 30 NSString *str = [dic valueForKey:@"Info"]; 31 32 UITextField *tf = (UITextField *)[self.view viewWithTag:1000]; 33 tf.text = str; 34 } 35 36 -(void)viewWillAppear:(BOOL)animated 37 { 38 [super viewWillAppear:animated]; 39 /* 40 // 单例传值 41 UITextField *tf = (UITextField *)[self.view viewWithTag:1000]; 42 tf.text = [AppStatus shareInstance].contextStr; 43 */ 44 } 45 46 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
DetailViewController.h
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import <UIKit/UIKit.h> 2 @protocol ChangeDelegate;//通知编译器有此代理 3 4 @interface DetailViewController : UIViewController 5 { 6 UITextField *textField; 7 } 8 @end
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
DetailViewController.m
![](https://oscdn.geek-share.com/Uploads/Images/Content/201603/69c5a8ac3fa60e0848d784a6dd461da6.gif)
1 #import "DetailViewController.h" 2 #import "AppStatus.h" 3 4 @implementation DetailViewController 5 @synthesize naviTitle = _naviTitle; 6 7 -(void)loadView 8 { 9 UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDonetarget:self action:@selector(doneAction:)]; 10 self.navigationItem.rightBarButtonItem = doneItem; 11 [doneItem release]; 12 } 13 14 // pop回前一个页面 15 -(void)doneAction:(id)sender 16 { 17 NSDictionary *dic = [NSDictionary dictionaryWithObject:textField.text forKey:@"Info"]; 18 19 [[NSNotificationCenter defaultCenter] postNotificationName:@"CHANGE_TITLE" object:nil userInfo:dic]; 20 21 [self.navigationController popViewControllerAnimated:YES]; 22 23 }
相关文章推荐
- iOS开发:使用Block在两个界面之间传值(Block高级用法:Block传值)
- iOS开发:使用Block在两个界面之间传值(Block高级用法:Block传值) 推荐
- iOS协议传值与Block传值
- 第04天实战技术(03):block开发使用场景(传值)
- iOS 中数据的传递
- 关于block中内存释放
- iOS传值二block传值,通知传值
- Objective-C研究之Block的使用
- Block 传值
- 芒果iOS开发之界面传值方式-数组回传值
- 控制器之间的数据传递——Block传值
- iOS block传值
- iOS开发 Block传值
- iOS开发 Block的使用方法和规范,以及可能遇到的问题
- iOS_四大传值
- 谈谈ios传值方式(属性传值、代理传值、Block传值、单例传值、通知传值、KVC传值)
- ruby block & proc & lambda
- iOS 委托代理传值与Block回传值.
- block传值(1)两个界面间传值
- Block作为参数