所以，我的 AppDelegate.m 中有这个函数:

- (BOOL) application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{        
    [CDVLocalStorage __verifyAndFixDatabaseLocations];
    NSURL* url = [launchOptions objectForKey:UIApplicationLaunchOptionsURLKey];
    if (url && [url isKindOfClass:[NSURL class]]) {
        invokeString = [url absoluteString];
        NSLog(@"PHR launchOptions = %@", url);
    }
    CGRect screenBounds = [[UIScreen mainScreen] bounds];
    self.window = [[UIWindow alloc] initWithFrame:screenBounds];
    self.window.autoresizesSubviews = YES;
    self.detailViewController
    self.detailViewController = [[MainViewController alloc] init];
    self.detailViewController.useSplashScreen = YES;
    self.detailViewController.wwwFolderName = @"www";
    self.detailViewController.startPage = @"index.html";
    self.detailViewController.invokeString = invokeString;
    NSString *deviceType = [UIDevice currentDevice].model;

    if (![deviceType hasPrefix:@"iPad"] && ![deviceType hasPrefix:@"iPad Simulator"])
    {   
        CGRect viewBounds = [[UIScreen mainScreen] applicationFrame];
        detailViewController.view.frame = viewBounds;

        BOOL forceStartupRotation = YES;
        UIDeviceOrientation curDevOrientation = [[UIDevice currentDevice] orientation];

        if (UIDeviceOrientationUnknown == curDevOrientation) {
            curDevOrientation = (UIDeviceOrientation)[[UIApplication sharedApplication] statusBarOrientation];
        }

        if (UIDeviceOrientationIsValidInterfaceOrientation(curDevOrientation)) {
                if ([self.detailViewController supportsOrientation:curDevOrientation]) {
                    forceStartupRotation = NO;
                }
        } 

        if (forceStartupRotation) {
            UIInterfaceOrientation newOrient;
            if ([self.detailViewController supportsOrientation:UIInterfaceOrientationPortrait])
                newOrient = UIInterfaceOrientationPortrait;
            else if ([self.detailViewController supportsOrientation:UIInterfaceOrientationLandscapeLeft])
                newOrient = UIInterfaceOrientationLandscapeLeft;
            else if ([self.detailViewController supportsOrientation:UIInterfaceOrientationLandscapeRight])
                newOrient = UIInterfaceOrientationLandscapeRight;
             else
                newOrient = UIInterfaceOrientationPortraitUpsideDown;

            NSLog(@"AppDelegate forcing status bar to: %d from: %d", newOrient, curDevOrientation);
            [[UIApplication sharedApplication] setStatusBarOrientation:newOrient];
        }

        self.window.rootViewController = self.detailViewController;
    } else {
        NavViewController *leftViewController = [[NavViewController alloc] initWithNibName:@"NavViewController" bundle:nil];
        UINavigationController *leftNavViewController = [[UINavigationController alloc] initWithRootViewController:leftViewController];
        leftNavViewController.navigationBarHidden = YES;

        UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
        detailNavigationController.navigationBarHidden = YES;

        leftViewController.detailViewController = detailViewController;

        self.splitViewController = [[UISplitViewController alloc] init];
        self.splitViewController.viewControllers = [NSArray arrayWithObjects:leftNavViewController, detailNavigationController, nil];

        self.window.rootViewController = self.splitViewController;
        self.splitViewController.delegate = detailViewController;
        detailViewController.svc = self.splitViewController;
    }
    [self.window makeKeyAndVisible];

    return YES;
}

是的，我知道它有很多代码，但我完全不确定要剪掉什么，因为在这个函数内部我不知道到底出了什么问题。

本质上，我的应用程序在 ipad 上以横向模式加载，但初始屏幕旋转 90 度并显示纵向而不是横向，然后闪回到我的实际初始屏幕。通过查看代码，我可以看出它在设备检查的 else 语句中触发，除此之外我真的可以借助你们的帮助来确定我需要进行哪些更改。

最佳答案

如果您只在应用程序中使用横向模式，请将 setStatusBarOrientation 设置为仅横向模式。

[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight];

或

[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft];

关于objective-c - 启动画面问题，Xcode/iOS 6/Phonegap，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12606978/