During app
launching, the system creates a main thread for the app and calls the app’s
main function on that main thread. The Xcode project’s default main function
hands over control to the UIKit framework, which takes care of initializing the
app before it is run.
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During app launching, the system creates a main thread for the app and calls the app’s main function on that main thread. The Xcode project’s default main function hands over control to the UIKit framework, which takes care of initializing the app before it is run.