Two-stage rotation animation is deprecated. This application should use the smoother single-stage an

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问题出在rootViewController同时包含UITabBarController和UINavigationController。

几经尝试,最后发现,在设置为window.rootViewController之前,先指定tabBarController.selectedIndex = 0,问题解决。

可以得出,出现上述错误,是因为XCode不知道你需要push哪个子viewController,在加载navigationController的时候,不知道要载入哪一个controller,于是无脑的将tabBarController的viewControllers都动画载入了。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    self.window.backgroundColor = [UIColor whiteColor];        UIStoryboard *pStoryBoard = [UIStoryboard storyboardWithName:@"FirstStoryBoard" bundle:nil];    UINavigationController *pNavigationController = [pStoryBoard instantiateInitialViewController];    UITabBarController *pTabBarController = (UITabBarController *)pNavigationController.visibleViewController;    pTabBarController.selectedIndex = 0; /// 就是这句话    [UIApplication sharedApplication].delegate.window.rootViewController = pNavigationController; /// 这句话在其他VC也可以用    [self.window makeKeyAndVisible];    return YES;}


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