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iOS页面间的传值细分有很多种,基本的传值方式有三种:委托Delegate传值、通知NSNotification传值、Block传值,其他在项目中可能会遇到的还有:UserDefault或文件方式传值、单例模式传值、通过设置属性传值,再有其他的传值方式没有遇到使用过在此不做说明。场景适合,自己使用舒服就是好的方式。
在iOS开发的过程中,常见的页面跳转传值方式大致可以分为两种,现归纳总结一下:
第一种:OneViewController页面跳转到TwoViewController页面(即顺传)
方法:在TwoViewController页面的控制器中,编写对应的属性,在OneViewController页面跳转到TwoViewController页面的地方,给TwoViewController的属性赋值即可
1 /** 2 * 接收页面传递的值 3 */ 4 @property(nonatomic,copy)NSString *text;
在A页面的试图控制器中
oneViewController的代码实例
@interface OneViewController () /** * 输入框 */ @property(weak,nonatomic)UITextField *txtField; @end @implementation OneViewController - (void)viewDidLoad { [super viewDidLoad]; #pragma mark - 创建UITextField //创建UITextField对象 UITextField *txtField = [[UITextField alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; //设置背景色 txtField.backgroundColor = [UIColor whiteColor]; //添加 [self.view addSubview:txtField]; //赋值 _txtField = txtField; #pragma mark - 创建btn //创建button对象 UIButton *pushBtn = [[UIButton alloc]initWithFrame:CGRectMake(200, 300, 100, 100)]; //设置按钮位置 pushBtn.center = self.view.center; //设置标题 [pushBtn setTitle:@"跳转" forState:UIControlStateNormal]; //添加按钮点击事件 [pushBtn addTarget:self action:@selector(pushBtnClick) forControlEvents:UIControlEventTouchUpInside]; //添加 [self.view addSubview:pushBtn]; } /** * 点击事件的方法 */ - (void)pushBtnClick { //创建TwoViewController对象 TwoViewController *twoVc = [[TwoViewController alloc]init]; //接收oneViewController传递值 twoVc.text = self.txtField.text; //执行push操作 [self.navigationController pushViewController:twoVc animated:YES]; } @end
第二种:A页面跳转到B页面,B页面再跳转回A页面
方法 :主流方案
1)通过委托delegate的方式实现
1 在B页面设置代理协议,代理属性
2 在A页面设置代理对象,实现代理方法
3 在回到B页面调用代理方法完成质的传递
oneViewController.m的代码实例
1 //遵守代理协议 2 @interface OneViewController () <TwoViewControllerDelegate> 3 4 /** 5 * 文本框 6 */ 7 @property(weak,nonatomic)UILabel *lable; 8 9 @end 10 11 @implementation OneViewController 12 13 - (void)viewDidLoad { 14 [super viewDidLoad]; 15 16 #pragma mark - 创建UILable 17 18 //创建UILable对象 19 UILabel *lable = [[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 20 21 //设置背景色 22 lable.backgroundColor = [UIColor whiteColor]; 23 24 //添加 25 [self.view addSubview:lable]; 26 27 //赋值 28 _lable = lable; 29 30 #pragma mark - 创建btn 31 32 //创建button对象 33 UIButton *pushBtn = [[UIButton alloc]initWithFrame:CGRectMake(200, 300, 100, 100)]; 34 35 //设置按钮位置 36 pushBtn.center = self.view.center; 37 38 //设置标题 39 [pushBtn setTitle:@"跳转到two" forState:UIControlStateNormal]; 40 41 //添加按钮点击事件 42 [pushBtn addTarget:self action:@selector(pushBtnClick) forControlEvents:UIControlEventTouchUpInside]; 43 44 //添加 45 [self.view addSubview:pushBtn]; 46 } 47 48 /** 49 * 点击事件的方法 50 */ 51 - (void)pushBtnClick { 52 53 //创建TwoViewController对象 54 TwoViewController *twoVc = [[TwoViewController alloc]init]; 55 56 //接收oneViewController传递值 57 twoVc.text = self.lable.text; 58 59 //设置代理对象 60 twoVc.delegate = self; 61 62 //执行push操作 63 [self.navigationController pushViewController:twoVc animated:YES]; 64 65 } 66 67 /** 68 * 实现代理方法设置lable文本 69 * 70 * @param text 传递值 71 */ 72 -(void)setLableText:(NSString *)text { 73 74 self.lable.text = text; 75 } 76 77 @end
TwoViewController.h的代码实例
1 #import <UIKit/UIKit.h> 2 3 //代理协议 4 @protocol TwoViewControllerDelegate <NSObject> 5 6 @optional 7 /** 8 * 代理方法 给OneViewController的lable赋值 9 */ 10 - (void)setLableText:(NSString *)text; 11 12 @end 13 14 @interface TwoViewController : UIViewController 15 16 /** 17 * 接收 A页面传递的值 18 */ 19 @property(nonatomic,copy)NSString *text; 20 21 /** 22 * 设置代理(为防止循环引用,此次采用了weak) 23 */ 24 @property(nonatomic,weak)id <TwoViewControllerDelegate>delegate; 25 26 @end
TwoViewController.m的代码实例
#import "TwoViewController.h" @interface TwoViewController () /** * 输入框 */ @property(weak,nonatomic)UITextField *twoTxtField; @end @implementation TwoViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor grayColor]; #pragma mark - 创建UILable //创建UITextField对象 UITextField *txtField = [[UITextField alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; //设置背景色 txtField.backgroundColor = [UIColor whiteColor]; //添加 [self.view addSubview:txtField]; //赋值 _twoTxtField = txtField; #pragma mark - 创建button //创建UIButton对象 UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(200, 200, 100, 100)]; //设置button的位置 btn.center = self.view.center; //设置button标题 [btn setTitle:@"返回one" forState:UIControlStateNormal]; //添加点击事件 [btn addTarget:self action:@selector(returnToOne) forControlEvents:UIControlEventTouchUpInside]; //添加 [self.view addSubview:btn]; } /** * 返回one 按钮点击事件 * * @param field oneViewController输入框 */ - (void)returnToOne { //判断是否响应 if ([self.delegate respondsToSelector:@selector(setLableText:)]) { //调用代理方法 [self.delegate setLableText:self.twoTxtField.text]; } //执行pop方法返回OneViewController页面 [self.navigationController popToRootViewControllerAnimated:YES]; } @end
效果:
代理方法实现传值过程中,最重要也是最容易忽略的,就是一定要设置delegate的指向。
(2)通知NSNotification传值方式实现
1 在OneViewController页面的控制器中注册通知,实现通知方法接收传递值(以子典形式传递),通知结束并销毁通知
2 在TwoViewController页面的控制器中发送通知
OneViewController.m代码示例
1 @interface OneViewController () 2 3 /** 4 * 文本框 5 */ 6 @property(weak,nonatomic)UILabel *lable; 7 8 @end 9 10 @implementation OneViewController 11 12 - (void)viewDidLoad { 13 [super viewDidLoad]; 14 15 #pragma mark - 注册通知 16 //注册通知 name参数就是指通知名 17 [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(setLableText:) name:@"setLableNsnotification" object:nil]; 18 19 #pragma mark - 创建UILable 20 21 //创建UILable对象 22 UILabel *lable = [[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 23 24 //设置背景色 25 lable.backgroundColor = [UIColor whiteColor]; 26 27 //添加 28 [self.view addSubview:lable]; 29 30 //赋值 31 _lable = lable; 32 33 #pragma mark - 创建btn 34 35 //创建button对象 36 UIButton *pushBtn = [[UIButton alloc]initWithFrame:CGRectMake(200, 300, 100, 100)]; 37 38 //设置按钮位置 39 pushBtn.center = self.view.center; 40 41 //设置标题 42 [pushBtn setTitle:@"跳转到two" forState:UIControlStateNormal]; 43 44 //添加按钮点击事件 45 [pushBtn addTarget:self action:@selector(pushBtnClick) forControlEvents:UIControlEventTouchUpInside]; 46 47 //添加 48 [self.view addSubview:pushBtn]; 49 } 50 51 /** 52 * 点击事件的方法 53 */ 54 - (void)pushBtnClick { 55 56 //创建TwoViewController对象 57 TwoViewController *twoVc = [[TwoViewController alloc]init]; 58 59 //接收oneViewController传递值 60 twoVc.text = self.lable.text; 61 62 //执行push操作 63 [self.navigationController pushViewController:twoVc animated:YES]; 64 65 } 66 67 /** 68 * 实现通知方法设置lable文本 69 * 70 * @param notification 通知信息 71 */ 72 -(void)setLableText:(NSNotification *)notification { 73 74 //创建一个字典用来传递通知信息 75 NSDictionary *nameDictionary = [notification userInfo]; self.lable.text = [nameDictionary objectForKey:@"text"]; 76 } 77 78 /** 79 * 使用结束 销毁通知 80 */ 81 - (void)dealloc { 82 83 //移除通知 84 [[NSNotificationCenter defaultCenter]removeObserver:self]; 85 } 86 @end
TwoViewController.m代码示例
1 @interface TwoViewController () 2 3 /** 4 * 输入框 5 */ 6 @property(weak,nonatomic)UITextField *twoTxtField; 7 @end 8 9 @implementation TwoViewController 10 11 - (void)viewDidLoad { 12 [super viewDidLoad]; 13 14 self.view.backgroundColor = [UIColor grayColor]; 15 16 #pragma mark - 创建UILable 17 //创建UITextField对象 18 UITextField *txtField = [[UITextField alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 19 20 //设置背景色 21 txtField.backgroundColor = [UIColor whiteColor]; 22 23 //添加 24 [self.view addSubview:txtField]; 25 26 //赋值 27 _twoTxtField = txtField; 28 29 #pragma mark - 创建button 30 31 //创建UIButton对象 32 UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(200, 200, 100, 100)]; 33 34 //设置button的位置 35 btn.center = self.view.center; 36 37 //设置button标题 38 [btn setTitle:@"返回one" forState:UIControlStateNormal]; 39 40 //添加点击事件 41 [btn addTarget:self action:@selector(returnToOne:) forControlEvents:UIControlEventTouchUpInside]; 42 43 //添加 44 [self.view addSubview:btn]; 45 } 46 47 /** 48 * 返回one 按钮点击事件 49 * 50 * @param field oneViewController输入框 51 */ 52 - (void)returnToOne:(id) sender { 53 54 //发送通知 55 [[NSNotificationCenter defaultCenter]postNotificationName:@"setLableNsnotification" object:self userInfo:@{@"text" : self.twoTxtField.text}]; 56 57 //执行pop方法返回OneViewController页面 58 [self.navigationController popToRootViewControllerAnimated:YES]; 59 60 } 61 62 63 @end
效果相同,在此就不贴图了。
(3)block方式实现
1 在TwoViewController视图控制器中,定义一个block,参数为字符串
2 在OneViewController图显示,回调block
TwoViewController.h代码示例
1 /** 2 * 设置参数为NSString类型block 为myBlock 3 */ 4 typedef void (^myBlock)(NSString *str); 5 6 @interface TwoViewController : UIViewController 7 8 /** 9 * 接收 A页面传递的值 10 */ 11 @property(nonatomic,copy)NSString *text; 12 13 /** 14 * 定义一个myBlock 类型的block 15 */ 16 @property(nonatomic,copy)myBlock block; 17 18 @end
TwoViewController.m代码示例
1 @interface TwoViewController () 2 3 /** 4 * 输入框 5 */ 6 @property(weak,nonatomic)UITextField *twoTxtField; 7 @end 8 9 @implementation TwoViewController 10 11 - (void)viewDidLoad { 12 [super viewDidLoad]; 13 14 self.view.backgroundColor = [UIColor grayColor]; 15 16 #pragma mark - 创建UILable 17 //创建UITextField对象 18 UITextField *txtField = [[UITextField alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 19 20 //设置背景色 21 txtField.backgroundColor = [UIColor whiteColor]; 22 23 //添加 24 [self.view addSubview:txtField]; 25 26 //赋值 27 _twoTxtField = txtField; 28 29 #pragma mark - 创建button 30 31 //创建UIButton对象 32 UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(200, 200, 100, 100)]; 33 34 //设置button的位置 35 btn.center = self.view.center; 36 37 //设置button标题 38 [btn setTitle:@"返回one" forState:UIControlStateNormal]; 39 40 //添加点击事件 41 [btn addTarget:self action:@selector(returnToOne) forControlEvents:UIControlEventTouchUpInside]; 42 43 //添加 44 [self.view addSubview:btn]; 45 } 46 47 /** 48 * 返回one 按钮点击事件 49 * 50 * @param field oneViewController输入框 51 */ 52 - (void)returnToOne { 53 54 if (self.block) { 55 56 //把当前输入框的text值给block 57 self.block(self.twoTxtField.text); 58 } 59 60 //执行pop方法返回OneViewController页面 61 [self.navigationController popToRootViewControllerAnimated:YES]; 62 63 } 64 65 66 @end
OneViewController.m代码示例
1 @interface OneViewController () 2 3 /** 4 * 文本框 5 */ 6 @property(weak,nonatomic)UILabel *lable; 7 8 @end 9 10 @implementation OneViewController 11 12 - (void)viewDidLoad { 13 [super viewDidLoad]; 14 15 16 #pragma mark - 创建UILable 17 18 //创建UILable对象 19 UILabel *lable = [[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 20 21 //设置背景色 22 lable.backgroundColor = [UIColor whiteColor]; 23 24 //添加 25 [self.view addSubview:lable]; 26 27 //赋值 28 _lable = lable; 29 30 #pragma mark - 创建btn 31 32 //创建button对象 33 UIButton *pushBtn = [[UIButton alloc]initWithFrame:CGRectMake(200, 300, 100, 100)]; 34 35 //设置按钮位置 36 pushBtn.center = self.view.center; 37 38 //设置标题 39 [pushBtn setTitle:@"跳转到two" forState:UIControlStateNormal]; 40 41 //添加按钮点击事件 42 [pushBtn addTarget:self action:@selector(pushBtnClick) forControlEvents:UIControlEventTouchUpInside]; 43 44 //添加 45 [self.view addSubview:pushBtn]; 46 } 47 48 /** 49 * 点击事件的方法 50 */ 51 - (void)pushBtnClick { 52 53 //创建TwoViewController对象 54 TwoViewController *twoVc = [[TwoViewController alloc]init]; 55 56 //接收oneViewController传递值 57 twoVc.text = self.lable.text; 58 59 //回调block 拿到传递值设置lable的text 60 twoVc.block = ^(NSString *str){ 61 62 self.lable.text = str; 63 }; 64 65 //执行push操作 66 [self.navigationController pushViewController:twoVc animated:YES]; 67 68 } 69 70 71 72 @end
以上就是三种基本的传值方式,也是我们在项目开发过程中最常使用的传值方式。
下面介绍两种在项目开发过程中也曾经遇到过,但是并不常用的传值方式。
(1)通过一个单例来传值
1 由于要用到单例模式,所以要创建一个继承于NSObject的DataSource类,存放数据
DataSource.h代码示例
1 #import <Foundation/Foundation.h> 2 @class DataSource; 3 4 @interface DataSource : NSObject 5 6 /** 7 * 存放传递值的属性 8 */ 9 @property (nonatomic, strong) NSString *text; 10 11 /** 12 * 返回单例对象的类方法 13 */ 14 +(DataSource*)sharedDataSource; 15 16 @end
DataSource.m代码示例
#import "DataSource.h" @implementation DataSource +(DataSource *)sharedDataSource { static DataSource *dataSource = nil; static dispatch_once_t once; //dispach_once函数中的代码块只会被执行一次,而且还是线程安全的。 dispatch_once(&once, ^{ dataSource = [DataSource new]; }); return dataSource; }
TwoViewController.m代码示例
1 #import "TwoViewController.h" 2 #import "DataSource.h" 3 4 @interface TwoViewController () 5 6 /** 7 * 输入框 8 */ 9 @property(weak,nonatomic)UITextField *twoTxtField; 10 @end 11 12 @implementation TwoViewController 13 14 - (void)viewDidLoad { 15 [super viewDidLoad]; 16 17 self.view.backgroundColor = [UIColor grayColor]; 18 19 #pragma mark - 创建UILable 20 //创建UITextField对象 21 UITextField *txtField = [[UITextField alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 22 23 //设置背景色 24 txtField.backgroundColor = [UIColor whiteColor]; 25 26 //添加 27 [self.view addSubview:txtField]; 28 29 //赋值 30 _twoTxtField = txtField; 31 32 #pragma mark - 创建button 33 34 //创建UIButton对象 35 UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(200, 200, 100, 100)]; 36 37 //设置button的位置 38 btn.center = self.view.center; 39 40 //设置button标题 41 [btn setTitle:@"返回one" forState:UIControlStateNormal]; 42 43 //添加点击事件 44 [btn addTarget:self action:@selector(returnToOne) forControlEvents:UIControlEventTouchUpInside]; 45 46 //添加 47 [self.view addSubview:btn]; 48 } 49 50 /** 51 * 返回one 按钮点击事件 52 * 53 * @param field oneViewController输入框 54 */ 55 - (void)returnToOne { 56 57 //获取唯一实例对象 58 DataSource *dataSource = [DataSource sharedDataSource]; 59 60 //给单例对象属性赋值 61 dataSource.text = self.twoTxtField.text; 62 63 //执行pop方法返回OneViewController页面 64 [self.navigationController popToRootViewControllerAnimated:YES]; 65 66 } 67 68 69 @end
OneViewController.m代码示例
1 #import "OneViewController.h" 2 #import "TwoViewController.h" 3 #import "DataSource.h" 4 5 @interface OneViewController () 6 7 /** 8 * 文本框 9 */ 10 @property(weak,nonatomic)UILabel *lable; 11 12 @end 13 14 @implementation OneViewController 15 16 - (void)viewDidLoad { 17 [super viewDidLoad]; 18 19 20 #pragma mark - 创建UILable 21 22 //创建UILable对象 23 UILabel *lable = [[UILabel alloc]initWithFrame:CGRectMake(self.view.center.x - 50, self.view.center.y - 100, 100, 30)]; 24 25 //设置背景色 26 lable.backgroundColor = [UIColor whiteColor]; 27 28 //添加 29 [self.view addSubview:lable]; 30 31 //赋值 32 _lable = lable; 33 34 #pragma mark - 创建btn 35 36 //创建button对象 37 UIButton *pushBtn = [[UIButton alloc]initWithFrame:CGRectMake(200, 300, 100, 100)]; 38 39 //设置按钮位置 40 pushBtn.center = self.view.center; 41 42 //设置标题 43 [pushBtn setTitle:@"跳转到two" forState:UIControlStateNormal]; 44 45 //添加按钮点击事件 46 [pushBtn addTarget:self action:@selector(pushBtnClick) forControlEvents:UIControlEventTouchUpInside]; 47 48 //添加 49 [self.view addSubview:pushBtn]; 50 } 51 52 /** 53 * 点击事件的方法 54 */ 55 - (void)pushBtnClick { 56 57 //创建TwoViewController对象 58 TwoViewController *twoVc = [[TwoViewController alloc]init]; 59 60 //接收oneViewController传递值 61 twoVc.text = self.lable.text; 62 63 64 //执行push操作 65 [self.navigationController pushViewController:twoVc animated:YES]; 66 67 } 68 69 70 -(void)viewDidAppear:(BOOL)animated{ 71 72 [super viewDidAppear:animated]; 73 74 //获取唯一实例 75 DataSource *dataSource = [DataSource sharedDataSource]; 76 77 //判断单例对象的属性值是否为空 78 if ([dataSource.text length] != 0) { 79 80 //把单例对象的属性值赋值给lable 81 self.lable.text = dataSource.text; 82 83 //把单例对象属性值清空 84 dataSource.text = @""; 85 86 } 87 } 88 89 @end
(2)NSUserdefault来传值,这种传值方法并不常用,代码量也比较少就不粘贴详细代码了,当作了解就阔以啦。
OneViewController.m示例代码
1 -(void)viewDidAppear:(BOOL)animated{ 2 3 [super viewDidAppear:animated]; 4 5 if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"myLableText"] length] != 0){ 6 7 self.lable.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"myLableText"]; [[NSUserDefaults standardUserDefaults] setObject:@"" forKey:@"myLableText"]; 8 } 9 10 }
TwoViewController.m示例代码
1 /** 2 * 返回one 按钮点击事件 3 * 4 * @param field oneViewController输入框 5 */ 6 - (void)returnToOne { 7 8 [[NSUserDefaults standardUserDefaults] setObject:self.twoTxtField.text forKey:@"myLableText"]; 9 10 //执行pop方法返回OneViewController页面 11 [self.navigationController popToRootViewControllerAnimated:YES]; 12 13 }
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原文地址:http://www.cnblogs.com/uncle4/p/5551718.html