首次启动后，启动屏幕没有出现吗？

Question

I am developing App with React native .
I set an image in the launchScreen.Xib .
The first time, the launch screen works well. After the launch screen hide, then I will see the View MainView .
I shut up the App in the background. A moment later, I tap the App icon to launch the App again.
To my surprise, the App will show the MainView first, the MainView continue show 0.2 seconds.

After the MainView flash, the launch screen show now. A few seconds later, the MainView show again.
My issue is the MainView will show before the launch screen in the later launch time.

In my opinion, the launch screen should show first and the MainView show later.

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  NSURL *jsCodeLocation;

  jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];

  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                      moduleName:@"patient"
                                               initialProperties:nil
                                                   launchOptions:launchOptions];
  rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];

  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  UIViewController *rootViewController = [UIViewController new];
  rootViewController.view = rootView;
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];
  return YES;
}

This is my code above in the AppDelegate.m . This is the initial code of React native .

One more thing, the MainView show a moment, and the screen shows a white view instead of the MainView , a moment later, the MainView show again.

Answer 1

Well, you're trying to instantiate and show with timer your own launch screen (not good!) while also asking iOS to do one. Just get rid of most or all of this code. Use the standard approach of having a launch storyboard then set up your main VC as normal in your appDelegate.

Using that timer is making assumptions about the timing of each app launch that iOS can't guarantee.