在兩個視圖之間傳遞值 - Xcode 4.2與故事板

Question

我是Xcode與故事板編程的新手。 我想從「SecondViewController」傳遞一個值（標籤文本）到「視圖控制器」。 這裏是我的代碼：

ViewController.m

- (IBAction)showSecondView:(id)sender { 
    NSLog(@"Trying.."); 
    // The identifier used here is set on the second view controller in the UIStoryboard. 
    SecondViewController *svc = [self.storyboard instantiateViewControllerWithIdentifier:@"SecondIdentifier"]; 
    NSLog(@"Test: %@",svc.labelTest.text); //this print NIL!! 
    svc.labelTest.text = @"GOOFY!!"; 
    [self.navigationController pushViewController:svc animated:YES]; 
} 

SecondViewController.h

#import <UIKit/UIKit.h> 

@interface SecondViewController : UIViewController 

- (IBAction)returnToFirstView:(id)sender; 
- (IBAction)toTabBar:(id)sender; 
@property (strong, nonatomic) IBOutlet UILabel *labelTest; 

@end 

SecondViewController.m

#import "SecondViewController.h" 

@implementation SecondViewController 
@synthesize labelTest; 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

有人可以幫助我嗎？ 非常感謝！

斯特凡諾

Answer 1

，如果你使用的是故事板，你爲什麼不使用- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

取代你- (IBAction)showSecondView:(id)sender { - 方法

有：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
if ([segue.identifier isEqualToString:@"SecondIdentifier"]) { 
SecondViewController *svc = (SecondViewController *)segue.destinationViewController; 
svc.labelTest.text = @"Goofy"; 
}