IOS模态视图的导航以及数据传输

IOS模态视图的导航以及数据传输

//FirstViewController  其中有一个按钮用来pop第二个viewController
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.title = @"登陆";
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(registerCompletion:) name:@"RegisterCompletionNotification" object:nil];
}

- (void)registerCompletion:(NSNotification *)notif{
    NSDictionary *theData = [notif userInfo];
    NSString *name = [theData objectForKey:@"name"];
    self.labelText.text = name;
}

- (void)viewWillUnload{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"RegisterCompletionNotification" object:nil];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)register:(UIButton *)sender {
    UIStoryboard *mainStoryboary = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *registerController = [mainStoryboary instantiateViewControllerWithIdentifier:@"registerViewController"];
    registerController.modalPresentationStyle = UIModalTransitionStyleCoverVertical;
    [self presentViewController:registerController animated:YES completion:^{
        NSLog(@"Present Modal View");
    }];
}

//其中有两个BarButtonItem 一个只是关闭视图 另一个还发送一个通知 包含输入框中的内容 发送到第一个试图用。
- (IBAction)done:(UIBarButtonItem *)sender {
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Dismiss RegisterViewController");
    }];
}

- (IBAction)save:(UIBarButtonItem *)sender {
    [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"Dismiss RegisterViewController");
        NSDictionary *dict = [NSDictionary dictionaryWithObject:self.textUsername.text forKey:@"name"];
        [[NSNotificationCenter defaultCenter] postNotificationName:@"RegisterCompletionNotification" object:nil userInfo:dict];
    }];
}