![]() Hopefully some other folks on Treehouse could provide more detail or refine my explanation. Specifically the section titled "Configuring windows" in Chapter 1. It is easy to change the project format in the Xcode file inspector: But this is. The view controller is now available to respond to eventsįor more details on how the view controller fits into your app's lifecycle, I found this book (Learning iOS UI Development by Yari D'areglia) to be very helpful in filling in the gaps of Apple's documentation. Using that template will make your life easier when creating your projects.The application:didFinishLaunchingWithOptions: function is then called.The window is made visible and the view is displayed.The rootViewController property of the window property is set to the initial view controller in the "main" storyboard.The only code included in the file is an import statement: import Foundation It imports the Foundation framework which includes basic classes like String and Date. A UIWindow object is instantiated and is used to set the window property on the AppDelegate class Select Swift File and name it PlayersViewController.swift. ![]() so that the user can switch to another copy of your app on another device and resume. During the launch of your app, iOS determines which storyboard to use as the "main" storyboard (based on the settings in the ist) Dive Deep Into Views, View Controllers, and Frameworks Matt Neuburg.Putting this all together, I would summarize the following: This diagram alludes to how the initial view is displayed and thus how the view controller is made available to respond to events from the user. Here is a link: App Programming Guide for iOS. Thus with no effort on your part, new projects have a main window in which to display their view controller content."Īlso, if you look at the "App Programming Guide for iOS", there is a diagram showing "The Launch Cycle" of an app. Storyboards are an exciting feature first introduced in iOS 5, which save time building user interfaces for your apps. Storyboards require the presence of a window property on the app delegate object, which the Xcode templates automatically provide. 4.8 (59) 1 Review Download materials Save for later Update note: Ehab Yosry Amer updated this tutorial for iOS 13, Xcode 11 and Swift 5. New iOS projects use storyboards to define the app’s views. ![]() It represents the physical screen youre seeing while using any app with your iOS. "Providing your app’s main window is easy because Xcode does it for you. The UIViewController is the logical place to start working on your UI code. The UIWindow Class Reference says the following: There doesn't seem to be a resource that definitively answers your question, however I've managed to piece together a few sources that should give you a better idea as to what is happening under the hood. ![]() The reason you do not see any code related to the view controller in the AppDelegate.swift code is because it is being handled by iOS (UIKit framework) on your behalf (although it can also be done programmatically as well). ![]()
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