From the moment the app icon is tapped on the home screen until the first screen is drawn, what happens in order in the system and in the app, including the stages before main()?
SpringBoard creates the process, dyld loads the libraries, does rebase/bind, and initializes the ObjC runtime (+load), and then it runs main → UIApplicationMain → the delegate and scene callbacks → the first frame.
Performance and debuggingShort answerAdvanced
You take over an app whose cold start takes more than 3 seconds. How would you split up…
#app-launch #dyld #pre-main #launch-time
Performance and debuggingMultiple choiceAdvanced
Which of these actually reduce the pre-main part of app launch (before main() is called)?…
#dyld #pre-main #launch-time
Build and distributionShort answerExpert
Your app embeds 40 dynamic frameworks. What gets better and what gets worse if you switch…
#dyld #launch-time
App lifecycle and systemMultiple choiceIntro
Which of these does the AppDelegate marked @main (or the UIApplicationMain call) do at…
#uiapplicationmain