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iOS页面间传值的方式(NSUserDefault/Delegate/NSNotification/Block/单例)

iOS页面间传值的方式(NSUserDefault/Delegate/NSNotification/Block/单例)

实现了以下iOS页面间传值:1.委托delegate方式;2.通知notification方式;3.block方式;4.UserDefault或者文件方式;5.单例模式方式;6.通过设置属性,实现页面间传值

在iOS开发中,我们经常会遇到页面间跳转传值的问题,现归纳总结一下:

情况1:A页面跳转到B页面

方法:

在B页面的控制器中,编写对应的属性,在A页面跳转到B页面的地方,给B的属性赋值即可

//SecondViewController.h

@property(nonatomic) NSInteger flag;//当前系统标示(0:其他传值方式;1:block传值方式)

在A页面的试图控制器中

 

//RootViewController.m

- (IBAction)showSecondView:(id)sender { SecondViewController *second = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]; second.delegate = self; second.flag = 0; [self presentViewController:second animated:YES completion:nil];}

 

情况2:A页面跳转到B页面,B页面再跳转回A页面

主流方案:

(1)通过委托delegate的方式实现

 

设置协议及方法 
 
//SecondViewController.h

@interface SecondViewController : UIViewController@property (nonatomic, weak)id<secondViewDelegate> delegate;@property (nonatomic, copy) ablock block;@end
 
 调用
 

显示
 
//RootViewController.m
-(void)showName:(NSString *)nameString{ self.nameLabel.text = nameString;}

 

最重要也是最容易忽略的,就是一定要设置delegate的指向。
 
 

(2)通过通知notification的方式实现

在B页面的控制器中,发送通知:
//SecondViewController.m- (IBAction)notificationMethod:(id)sender {    if ([self notEmpty]) {        [[NSNotificationCenter defaultCenter] postNotificationName:@"ChangeNameNotification" object:self userInfo:@{@"name":self.nameTextField.text}];        [self dismissViewControllerAnimated:YES completion:nil];    }else{        [self showAlert];    }}

 

在A页面的控制器中,注册通知:

//RootViewController.m- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ChangeNameNotification:) name:@"ChangeNameNotification" object:nil];}

当我们不使用时,要记得删掉通知:

//RootViewController.m-(void)dealloc{    [[NSNotificationCenter defaultCenter] removeObserver:self];}

 

 调用,显示

//RootViewController.m-(void)ChangeNameNotification:(NSNotification*)notification{    NSDictionary *nameDictionary = [notification userInfo];    self.nameLabel.text = [nameDictionary objectForKey:@"name"];}

 

(3)block方式实现

block介绍:http://blog.csdn.net/totogo2010/article/details/7839061

链接一篇描述block回调挺有意思的文章: http://blog.csdn.net/mobanchengshuang/article/details/11751671

分析:

在B试图控制器中,定义一个block,参数为字符串

//SecondViewController.htypedef void (^ablock)(NSString *str);
//SecondViewController.h@property (nonatomic, copy) ablock block;

在B试图控制器中,当输入名字,点击对应的确定按钮后

- (IBAction)blockMethod:(id)sender {    if ([self notEmpty]) {        if (self.block) {            self.block(self.nameTextField.text);            [self dismissViewControllerAnimated:YES completion:nil];        }    }else{        [self showAlert];    }}

在A试图显示,回调block

- (IBAction)showSecondWithBlock:(id)sender {    SecondViewController *second = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];    [self presentViewController:second animated:YES completion:nil];    second.block = ^(NSString *str){        self.nameLabel.text = str;    };}

 

 

在查阅资料的过程中,我还看到了以下几种方案:

(1)使用SharedApplication,定义一个变量来传递(感觉和单例的方式一样)

 

(2)使用文件,或者NSUserdefault来传递

 

//通过文件或者UserDefault方式存值(感觉不太适合此类传值,如果要用文件或者UserDefault方式存值的话,可以考虑此方式)- (IBAction)userDefaultMethod:(id)sender {    if ([self notEmpty]) {        [[NSUserDefaults standardUserDefaults] setObject:self.nameTextField.text forKey:@"myNameText"];        [self dismissViewControllerAnimated:YES completion:nil];    }else{        [self showAlert];    }}

在A试图控制器显示

-(void)viewDidAppear:(BOOL)animated{    [super viewDidAppear:animated];    //如果想测试通过UserDefault方式传值或者通过单例方式传值,取消以下注释即可/*    if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"] length] != 0) {        self.nameLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"];        [[NSUserDefaults standardUserDefaults] setObject:@"" forKey:@"myNameText"];    }    DataSource *dataSource = [DataSource sharedDataSource];    if ([dataSource.myName length] != 0) {        self.nameLabel.text = dataSource.myName;        dataSource.myName = @"";    }*/}

 

(3)通过一个单例的class来传递

B试图控制器

//通过单例方式传值(感觉不太适合此类传值,如果要用单例方式传值的话,可以考虑此方式)- (IBAction)singletonMethod:(id)sender {    if ([self notEmpty]) {        DataSource *dataSource = [DataSource sharedDataSource];        dataSource.myName = self.nameTextField.text;        [self dismissViewControllerAnimated:YES completion:nil];    }else{        [self showAlert];    }}

A试图控制器显示

-(void)viewDidAppear:(BOOL)animated{    [super viewDidAppear:animated];    //如果想测试通过UserDefault方式传值或者通过单例方式传值,取消以下注释即可/*    if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"] length] != 0) {        self.nameLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"myNameText"];        [[NSUserDefaults standardUserDefaults] setObject:@"" forKey:@"myNameText"];    }    DataSource *dataSource = [DataSource sharedDataSource];    if ([dataSource.myName length] != 0) {        self.nameLabel.text = dataSource.myName;        dataSource.myName = @"";    }*/}@end

这里面用到了单例模式,编写了DataSource这个类,存放数据

////  DataSource.h//  TestCallBack////  Created by csdc-iMac on 14-7-17.//  Copyright (c) 2014年 JuneWang. All rights reserved.//#import <Foundation/Foundation.h>@interface DataSource : NSObject@property (nonatomic, strong) NSString *myName;+(DataSource*)sharedDataSource;@end 

 

////  DataSource.m//  TestCallBack////  Created by csdc-iMac on 14-7-17.//  Copyright (c) 2014年 JuneWang. All rights reserved.//#import "DataSource.h"@implementation DataSource+(DataSource *)sharedDataSource{    static DataSource *dataSource = nil;    static dispatch_once_t once;    dispatch_once(&once, ^{        dataSource = [DataSource new];    });    return dataSource;}@end

 

程序运行截图

A视图:

B视图

当输入姓名,并点击对应的确认按钮后,会回到A视图,并显示在B视图中输入的姓名

 

祝:玩得开心,有什么别的办法或者不正确的地方,欢迎指正。

如果写得不详细,可以通过源码分析。

 

 参考:http://blog.csdn.net/cocoarannie/article/details/11857141

http://www.cnblogs.com/heri/archive/2013/03/18/2965815.html

 

源码地址:https://github.com/wangtao169447/PassValue