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#import "ViewController.h" #import "SViewController.h" @interface ViewController () @property (weak, nonatomic) IBOutlet UILabel *showLabel; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //1.注册为观察者,监听B视图中的通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(AMethod:) name:@"MyNotificationName" object:nil]; } -(void)AMethod:(NSNotification *)notification { //2.获取通知携带的数据,更新label的文本信息 NSDictionary *dictData = [notification userInfo]; NSString *str = [dictData objectForKey:@"MyUserInfoKey"]; self.showLabel.text = str; } - (IBAction)goSVC:(id)sender { SViewController *svc = [[SViewController alloc] init]; [self presentViewController:svc animated:YES completion:^{ } ]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; //3.移除所有通知 [[NSNotificationCenter defaultCenter]removeObserver:self]; } @end ----------- #import "SViewController.h" @interface SViewController () @property (strong, nonatomic) UITextField *textField; @end @implementation SViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.view.backgroundColor = [UIColor redColor]; self.textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 200, 100, 30)]; self.textField.backgroundColor = [UIColor whiteColor]; [self.view addSubview:self.textField]; UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; btn.frame = CGRectMake(50, 60, 30, 20); [btn setTitle:@"go" forState:UIControlStateNormal]; [self.view addSubview:btn]; [btn addTarget:self action:@selector(clickGoVC:) forControlEvents:UIControlEventTouchUpInside]; } - (void)clickGoVC:(id)sender { //返回视图A并发布通知 [self dismissViewControllerAnimated:YES completion:^{ //1.创建userInfo携带的信息 NSString *str = self.textField.text; NSDictionary *dictData = [NSDictionary dictionaryWithObject:str forKey:@"MyUserInfoKey"]; //2.发布信息 [[NSNotificationCenter defaultCenter] postNotificationName:@"MyNotificationName" object:nil userInfo:dictData]; }]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
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原文地址:http://www.cnblogs.com/garywong1949/p/5487921.html