在视图控制器之间传递数据 - iOS Xcode - 有什么好办法？

Question

好吧,我会尝试尽可能简单(当我试着问这个问题时,我好像在chat.stackoveflow.com上跑来跑去).我想将文本从一个viewcontroller中的textfield传递给另一个viewcontroller.

我应该使用Model类并将textfield.text存储在Model.[h/m]文件中,然后让第二个视图控制器访问存储在模型中的数据吗？

基本上这就是我所拥有的,

ViewControllerWelcome.h

@interface ViewControllerWelcome : UIViewController { }

@property (weak, nonatomic) IBOutlet UITextField *textFieldUsername;

ViewControllerWelcome.m

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
                ViewControllerHome *home = (ViewControllerHome *)[storyboard instantiateViewControllerWithIdentifier:@"Home"];
                NSString *username = _textFieldUsername.text;
                home.lblUSERNAME.text=username;
                [self presentModalViewController:home animated:YES];

ViewControllerHome.h

@interface ViewControllerHome : UIViewController {
NSString *username;
UILabel *lblUSERNAME;
}

@property (weak, nonatomic) IBOutlet UILabel *lblUSERNAME;

ViewControllerHome.m

- (void)changeUSERNAME {

 // get username from welcome tf
ViewControllerWelcome *welcome = [[ViewControllerWelcome alloc] init];
 welcome.username = [self lblUSERNAME.text];
 // _lblUSERNAME.text = welcome._textFieldUsername.text;
 //welcome.textFieldUsername.text = _username;
 // username = welcome.textFieldUsername.text;
 NSLog(@"username = %@",username);
// welcome.textFieldUsername.text = _lblUSERNAME.text;
// NSLog(@"username = %@",welcome.textFieldUsername.text);
}    

正如你所看到的,我尝试了几种不同的东西,但无法提出一个可行的解决方案:-l

Answer 1

由于您使用的是Storyboard,因此使用Segues执行ViewControllers之间的转换更有意义.如果您不熟悉segues,可以在这里查看:

http://developer.apple.com/library/IOs/#featuredarticles/ViewControllerPGforiPhoneOS/CreatingCustomSegues/CreatingCustomSegues.html

在IB中创建segue非常简单.完成设置后,即可实施
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender并配置目标视图控制器.所以你会得到类似的东西.

-(void)prepareForSegue(UIStoryboardSegue *)segue sender:(id)sender{
    // Assume you have a viewHomeSegue defined that has the name of the segue you want to perform
    NSString * segueIdentifier = [segue identifier];
    if([segueIdentifier isEqualToString:viewHomeSegue]){
        ViewControllerHome * homeController = (ViewControllerHome *)[segue destinationViewController];
        homeController.lblUSERNAME.text = _textFieldUsername.text;
    }
}