在Tab Bar Controller中建立Navigation Controller (二)

(這篇是要修正舊的這篇中比較不好的作法。如果你完全不用Interface Builder，那麼你就不需要為ViewController產生.xib檔，那麼就用這篇這種作法。)

AppDelegate.h：

#import

@interface AppDelegate : UIResponder
{
UIWindow *window;
UITabBarController *tabBarController;
}
@property (strong, nonatomic) UIWindow *window;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;

@end

AppDelegate.m：


#import "AppDelegate.h"

#import "FirstViewController.h"
#import "SecondViewController.h"
#import "ThirdViewController.h"
#import "FourthViewController.h"
#import "FifthViewController.h"

@implementation AppDelegate

@synthesize window;
@synthesize tabBarController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
tabBarController = [[UITabBarController alloc]init];

FirstViewController *firstViewController = [[FirstViewController alloc] initWithStyle:UITableViewStyleGrouped];
firstViewController.title = @"First";
UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:firstViewController];
nav1.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:0];

SecondViewController *secondViewController = [[SecondViewController alloc] init];
secondViewController.title = @"Second";
UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:secondViewController];
nav2.tabBarItem.title=@"Second";

ThirdViewController *thirdViewController = [[ThirdViewController alloc] init];
thirdViewController.title = @"Third";
UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:thirdViewController];
nav3.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Third" image:[UIImage imageNamed:@"third"] tag:2];

FourthViewController *fourthViewController = [[FourthViewController alloc] init];
fourthViewController.title = @"Fourth";
UINavigationController *nav4 = [[UINavigationController alloc] initWithRootViewController:fourthViewController];
nav4.tabBarItem.title=@"Fourth";

FifthViewController *fifthViewController = [[FifthViewController alloc] init];
fifthViewController.title = @"Fifth";
UINavigationController *nav5 = [[UINavigationController alloc] initWithRootViewController:fifthViewController];
nav5.tabBarItem.title=@"Fifth";

tabBarController.viewControllers = [NSArray arrayWithObjects:nav1, nav2, nav3, nav4, nav5, nil];

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
[self.window addSubview:tabBarController.view];
return YES;
}

@end