我想在进入我的应用程序之前显示带有活动指示器的启动画面视图,以从服务器加载一些信息。以下是我的工作方式:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
FeedViewController *feedViewController = [[FeedViewController alloc] initWithNibName:@"FeedViewController" bundle:nil];
MenuViewController *menuViewController=[[MenuViewController alloc] initWithNibName:@"MenuViewController" bundle:nil];
self.navController = [[UINavigationController alloc] initWithRootViewController:feedViewController];
IIViewDeckController* deckController = [[IIViewDeckController alloc] initWithCenterViewController:self.navController leftViewController:menuViewController rightViewController:nil];
deckController.panningMode=IIViewDeckNoPanning;
deckController.panningView=menuViewController.view;
self.window.rootViewController = deckController;
[self.window makeKeyAndVisible];
// show splash screen until data is loaded
SplashScreenViewController *controller = [[SplashScreenViewController alloc] initWithNibName:@"SplashScreenViewController" bundle:nil];
controller.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[feedViewController presentModalViewController:controller animated:NO];
return YES;
}
在FeedViewController.m中,我做了类似这样的事情:
- (void)viewDidLoad
{
// load data from a server
[self performSelector:@selector(dismissSplashScreen) withObject:nil afterDelay:0.0];
}
此代码适用于iOS6,但是当我使用iOS5进行测试时,带有活动指示器旋转的闪屏不会消失。我怀疑我可能会以错误的方式实现启动画面。 (但我不明白为什么这在iOS6中有效?)
答案 0 :(得分:1)
我自己通过使用bool变量来检查是否应该显示启动画面来解决这个问题。显示启动画面的代码将移至FeedViewController的viewDidLoad
。
这种方法似乎适用于iOS5和iOS6。