应用启动屏幕和身份验证

Question

I have an app that is authenticating the user using a remote API.

Is it possible to use the launch screen to call the API and delay the launch of the initial controller? I haven't figured that one out.

Thanks

Answer 1

Launch screen (aka Default.png, or -568h, etc.) will automatically remove itself once app is loaded. But there is a trick. If you want to implement such functionality you can add UIImageView (with corresponding Default.png, or -568h, etc) as a subview above your root vc. And then remove it after auth.

So the user will still see the launch screen while your app is authenticating.

Answer 2

In .h

UIImageView *launchImageView;

In .m

Under viewDiDLoad:

launchImageView = [[UIImageView alloc] initWithFrame:[self bounds]];
launchImageView.image = [UIImage imageNamed:YOUR_IMAGE];
[self.view addSubView:launchImageView];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES]; //Network Activity Indicator if you want to show
//YOUR API GOES HERE

When you get the data from your API, then in the main thread , remove that launchImageView

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
[launchImageView removeFromSuperView];