[問題] 多個TabBar

[Testarosa (Testarosa)]

不好意思 新手發問

我想建立一個四個TabBar分頁的控制
AppDelegate.h 的程式碼如下:

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder
<UIApplicationDelegate,UITabBarControllerDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UITabBarController *tab;

@end

AppDelegate.m如下:

#import "AppDelegate.h"
#import "FirstViewController.h"
#import "SecondViewController.h"
#import "thirdViewController.h"
#import "FourthViewController.h"

@implementation AppDelegate

@synthesize window;
@synthesize tab;

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];

FirstViewController *v1=[[FirstViewController alloc]
initWithNibName:@"FirstViewController"bundle:nil];

SecondViewController *v2=[[SecondViewController
alloc]initWithNibName:@"SecondViewControler" bundle:nil];

thirdViewController *v3=[[thirdViewController
alloc]initWithNibName:@"thirdViewController" bundle:nil];

FourthViewController *v4=[[FourthViewController
alloc]initWithNibName:@"FourthViewController" bundle:nil];

self.tab = [[UITabBarController alloc]init];
self.tab.viewControllers = [NSArray arrayWithObjects:v1,v2,v3,v4, nil];

self.window.rootViewController = self.tab;
[self.window makeKeyAndVisible];
return YES;

}

最後跑出一個錯誤：Could not load NIB in bundle
請問是哪個環節出錯了  謝謝大家!!

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推 johnlinvc:initWithNibName:@""   bundle:[NSBundle mainBundle]
→ Testarosa:嗯 錯誤訊息還是一樣耶 我是follow這個影片的範例http:/
→ Testarosa:http://www.youtube.com/watch?v=UMpNbCs4mr4&feature=r
推 level39:（略）*v4=[[FourthViewController alloc] init]; 試看看
→ Testarosa:感謝各位!!  用了好久終於成功了!!  原來有用Storyboard
→ Testarosa:的方法會不一樣!!