UE4 ios add method in application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

i want integrate a 3rd party sdk in my project. i need put init action after the app launched in application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions. I had found the FIOSCoreDelegates::OnOpenURL.AddStatic, but i did not find what i need. And i also need to do something when the root view controller. How would i do?Thanks!