iOS (iPhone/iPad) SDK - Application not changing orientation

问题

In my custom Tab Bar Application, the orientation never seems to change, even if I force rotate the status bar. Here is my code in my AppDelegate:

AppDelegate.h:

    #import <UIKit/UIKit.h>
    #import "MBProgressHUD.h"

    @class exampleViewContoller;
    @class example1ViewController;
    @class example2ViewController;
    @class example3ViewController;
    @class example4ViewController;

    @interface <appname>AppDelegate : NSObject <UIApplicationDelegate, MBProgressHUDDelegate> {
        UIWindow *window;
        UITabBarController *rootController;
        exampleViewContoller *viewController;
        example1ViewController *viewController1;
        example2ViewController *viewController2;
        example3ViewController *viewController3;
        example4ViewController *viewController4;
        NSMutableData *responseData;
        NSMutableArray *tweets;
        MBProgressHUD *HUD;
    }

    @property (nonatomic, retain) IBOutlet UIWindow *window;
    @property (nonatomic, retain) IBOutlet UITabBarController *rootController;
    @property (nonatomic, retain) IBOutlet exampleViewContoller *viewController;
    @property (nonatomic, retain) IBOutlet example1ViewController *viewController1;
    @property (nonatomic, retain) IBOutlet example2ViewController *viewController2;
    @property (nonatomic, retain) IBOutlet example3ViewController *viewController3;
    @property (nonatomic, retain) IBOutlet example4ViewController *viewController4;
    @property (nonatomic, retain) NSMutableArray *tweets;

    @end

AppDelegate.m:

    #import "<appname>AppDelegate.h"
    #import "exampleViewContoller.h"
    #import "example1ViewController.h"
    #import "example2ViewController.h"
    #import "example3ViewController.h"
    #import "example4ViewController.h"
    #import "SBJson.h"
    #define TMP NSTemporaryDirectory()

    @implementation <appname>AppDelegate

    @synthesize window = _window;
    @synthesize rootController;
    @synthesize viewController;
    @synthesize viewController1;
    @synthesize viewController2;
    @synthesize viewController3;
    @synthesize viewController4;
    @synthesize tweets;

    #pragma mark -
    #pragma mark Application lifecycle

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        CGFloat width = self.rootController.view.bounds.size.width;
        CGFloat height = self.rootController.view.bounds.size.height;
        UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, width, height)];
        UIImage *imageView = [UIImage imageNamed:@"TabBarBackground.png"];
        UIColor *kMainColor = [[UIColor alloc] initWithPatternImage:imageView];

        [v setBackgroundColor:kMainColor];
        [kMainColor release];

        [self.rootController.tabBar insertSubview:v atIndex:0];
        [imageView release];
        [v release];

        responseData = [[NSMutableData data] retain];
        tweets = [NSMutableArray array];
        NSURLRequest *request = [NSURLRequest requestWithURL:
                         [NSURL URLWithString:@"http://api.twitter.com/1/statuses/user_timeline.json?screen_name=ENTER_USER_HERE&count=20"]];
        [[NSURLConnection alloc] initWithRequest:request delegate:self];

        NSAssert(nil != self.rootController, @"tab bar controller not hooked up!");

        BOOL iPad = NO;
#ifdef UI_USER_INTERFACE_IDIOM
        iPad = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);
#endif

        if (iPad) {
            self.viewController = [[[exampleViewContoller alloc] initWithNibName:@"exampleViewController_iPad" bundle:nil] autorelease];
            self.viewController1 = [[example1ViewController alloc] initWithNibName:@"example1ViewController_iPad" bundle:nil] autorelease];
            self.viewController2 = [[[example2ViewController alloc] initWithNibName:@"example2ViewController_iPad" bundle:nil] autorelease];
            self.viewController3 = [[[example3ViewController alloc] initWithNibName:@"example3ViewController_iPad" bundle:nil] autorelease];
            self.viewController4 = [[[example4ViewController alloc] initWithNibName:@"example4ViewController_iPad" bundle:nil] autorelease];
        } else {
            self.viewController = [[[exampleViewContoller alloc] initWithNibName:@"exampleViewContoller_iPhone" bundle:nil] autorelease];
            self.viewController1 = [[[example1ViewController alloc] initWithNibName:@"example1ViewController_iPhone" bundle:nil] autorelease];
            self.viewController2 = [[[example2ViewController alloc] initWithNibName:@"example2ViewController2_iPhone" bundle:nil] autorelease];
            self.viewController3 = [[[example3ViewController alloc] initWithNibName:@"example3ViewController_iPhone" bundle:nil] autorelease];
            self.viewController4 = [[[example4ViewController alloc] initWithNibName:@"example4ViewController_iPhone" bundle:nil] autorelease];
        }
            self.rootController.viewControllers = [NSArray arrayWithObjects:self.viewController, self.viewController4, self.viewController1, self.viewController3, self.viewController2, nil];

        [viewController release];
        [viewController1 release];
        [viewController2 release];
        [viewController3 release];
        [viewController4 release];

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0
        self.window.rootViewController = self.rootController;
#else
        [self.window addSubview:rootController.view];
#endif
        [self.window makeKeyAndVisible];
        HUD = [[MBProgressHUD alloc] initWithView:viewController.view];
        [viewController.view addSubview:HUD];
        [HUD show:NO];

        HUD.delegate = self;

        HUD.labelText = @"Loading";


        return YES;
    }

//[---CODE CLIP---]

    - (void)application:(UIApplication *)application didChangeStatusBarOrientation:(UIInterfaceOrientation)oldStatusBarOrientation {
        CGFloat width = self.rootController.view.bounds.size.width*2;
        CGFloat height = self.rootController.view.bounds.size.height;
        UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, width, height)];
        UIImage *imageView = [UIImage imageNamed:@"TabBarBackground.png"];
        UIColor *kMainColor = [[UIColor alloc] initWithPatternImage:imageView];

        [v setBackgroundColor:kMainColor];
        [kMainColor release];
        [self.rootController.tabBar insertSubview:v atIndex:0];
        [imageView release];
        [v release];

    }

    - (void)hudWasHidden {
        [HUD removeFromSuperview];
    }

//[---CODE CLIP---]

    - (void)dealloc
    {
        [_window release];
        [rootController release];
        [HUD release];
        [super dealloc];
    }

    @end

The problem is that when I rotate the device in iOS Simulator, the application won't rotate. Any ideas would be much appreciated!

UPDATE

I have also noticed that the launch image is also not rotating (for iPad that is - iPhone doesn't do landscape launch images).

NOTE FOR JMANS

I overrode UITabBarController:

@implementation UITabBarController (MyApp)

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    if(self.selectedIndex==4) 
        return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
    else
        return (toInterfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end

回答1:

I would start by including this in all of your view controllers:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
} 

Also, make sure that you are supporting multiple orientations in your Info.plist.

回答2:

Tab Bar Controllers and View Rotation

Tab bar controllers support a portrait orientation by default and do not rotate to a landscape orientation unless all of the contained view controllers support such an orientation. When a device orientation change occurs, the tab bar controller queries its array of view controllers. If any one of them does not support the orientation, the tab bar controller does not change its orientation.

来源：https://stackoverflow.com/questions/6969624/ios-iphone-ipad-sdk-application-not-changing-orientation