Comments (3)
More context:
"Explain how the UIApplicationMain function instantiates a UIApplication object, assigns the app delegate to the UIApplication object delegate property, begins the main event loop, and, if configured, loads the main storyboard interface."
(Let's show, not tell.)
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Additional context:
"warning indicating that although view controllers exist in the storyboard, the tab controller scene is unreachable because no initial view controller has been specified."
Per warning: Unsupported Configuration: Scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier:.
Lesson 2:
"Discuss how, when a project is configured with a main storyboard, the work started by the UIApplicationMain function instantiates a window, loads the main storyboard, instantiates the storyboard's initial view controller, assigns the new view controller to the window’s rootViewController property, and then makes the window visible on the screen."
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Summarizing this material, for Swift and modern iOS:
https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/TheAppLifeCycle/TheAppLifeCycle.html
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