应用程序启动时的UIActivityIndi​​cator

Question

我已搜索但未找到我正在寻找的确切内容。我有一个UITabBar应用程序，在第一个视图中，从Web加载大量数据。这可能需要几秒钟，尤其是连接到Edge网络时。

我有一个显示徽标等的启动屏幕，但我想添加一个活动指示器来向用户显示某些内容确实在进行。

我怎样才能做到这一点？我发现的帖子只会在标签之间切换时考虑ActivityIndi​​cators。

由于

Answer 1

如果加载数据需要很长时间，你可以使用另一个视图控制器作为你的rootViewController只有Splashscreen（屏幕上有你可以显示的图像或视图，直到数据被下载）和活动指示器以及下载时完成从窗口中删除temprootViewcontroller并将原始控制器添加到窗口。

修改

    //To show custom Splash screen do something like in
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

SplashScreenVC *splashScreenVC = [[SplashScreenVC alloc] initWithNibName:@"SplashScreenVC" bundle:nil];
    self.window.rootViewController = splashScreenVC;
    [self.window makeKeyAndVisible];

//And when your data finishes downloading you can write following there to show your tabBar.

AppDelegate*delegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
delegate.window.rootViewController = delegate.tabBarController;
[delegate.window makeKeyAndVisible];

//If you want to simulate downloading and want to sleep the device you can try this in SplashScreenVC

-(void)viewDidAppear:(BOOL)animated{
        [super viewDidAppear:animated];
        [self performSelector:@selector(gotosleep) withObject:nil afterDelay:1.0];
    }
    -(void)gotosleep{
        sleep(5);
        AppDelegate*delegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
        delegate.window.rootViewController = delegate.tabBarController;
        [delegate.window makeKeyAndVisible];
    }