//启动画面为横屏！！

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    //启动画面为横屏！！

    [application setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];

    

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    // Override point for customization after application launch.

    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];

    self.window.rootViewController = self.viewController;

    [self.window makeKeyAndVisible];

    return YES;

}

//获得屏幕当前屏幕方向

    NSLog(@"[[UIDevice currentDevice] orientation]==%d",[[UIDevice currentDevice] orientation]);}

这个函数只能是在程序完全启动之后，才能调用之后，一般用于viewdidload之后。