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UPDATE XCODE CODE

Window.rootViewController = UIHostingController(rootView: ContentView()) SceneDelegate isn’t specific to SwiftUI, but this line is: In the project navigator, open the RGBullsEye group to see what you got: the old AppDelegate.swift is now split into AppDelegate.swift and SceneDelegate.swift and SceneDelegate has the window: Save your project somewhere outside the RGBullsEye-Starter folder. In Xcode 11, create a new Xcode project ( Shift-Command-N), select iOS ▸ Single View App, name the project RGBullsEye, then select SwiftUI in the User Interface menu: In this article, you’ll use SwiftUI to create a basic version of this game.

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I wrote this app for RWDevCon 2016 and updated the code to Swift 5 for this article. This game uses three sliders - for red, green and blue values in the RGB color space - to match a target color. Build and run the UIKit app in the RGBullsEye-Starter folder. Get started by downloading the materials for this article - you can find the link at the top or bottom of this article.

UPDATE XCODE INSTALL

If you don’t have a spare Mac, you can install Catalina on a separate APFS volume ( not partition). SwiftUI is very new, so you also need some level of comfort using beta-like software. To see the SwiftUI preview, you need macOS 10.15. Note: This article assumes you’re comfortable with using Xcode to develop iOS apps. In this article, you’ll use SwiftUI to build a variation of our famous BullsEye game from iOS Apprentice. The SwiftUI APIs are consistent across platforms, so it will be easier to develop the same-ish app on multiple platforms using the same source code on each. SwiftUI doesn’t replace UIKit - like Swift and Objective-C, you can use both in the same app. And it’s code, but a lot less than you’d write for UIKit, so it’s easier to understand, edit and debug. There aren’t any identifier strings to get wrong.

UPDATE XCODE UPDATE

SwiftUI to the rescue! You can preview a SwiftUI view side-by-side with its code - a change to one side will update the other side, so they’re always in sync. And, while it might be faster and easier to design a new UI in a WYSIWYG editor, it’s much more efficient to copy or edit UI when it’s written out in code. Or you’ve fumed about stringly-typed identifiers for segues or table view cells that you have to use in your code, but Xcode can’t check for you because they’re strings. IB and Xcode were separate apps before Xcode 4, and the seams still show every time you edit the name of an IBAction or IBOutlet or delete it from your code, and your app crashes because IB doesn’t see changes to code. SwiftUI lets you ignore Interface Builder (IB) and storyboards without having to write detailed step-by-step instructions for laying out your UI. Some developers have joked (?) that they might be “ Sherlocked” by SwiftUI! It’s an enormous step towards Apple’s goal of getting everyone coding, simplifying the basics so you can spend more time on custom features that delight your users. SwiftUI is the most exciting news since Apple announced Swift in 2014.

Update xcode