Instruction 2

Adapting UI

Using a ScrollView quickly fixed the problem, and users of RGB Picker can now enjoy the app in landscape. And yet, something still feels off. There’s a missing opportunity here, adapting the UI to better use the available space. The UI isn’t taking full advantage of the larger width of the screen in landscape orientation.

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The Importance of Using the Right Layout

VStack and HStack are used to build the most common UI. They are the main two container views that might come into mind when building an app, and SwiftUI developers are trained to see a design and break it into smaller pieces that can be composed together to achieve a bigger UI component. VStack and HStack will get the job done with most UI ideas.

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Understanding Device Size Classes

This is where device size classes comes into play. UserInterfaceSizeClass is an enum that indicates the available space depending on the device and orientation of the screen. It can be either .compact or .regular.

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@Environment(\.horizontalSizeClass) var horizontalSizeClass
@Environment(\.verticalSizeClass) var verticalSizeClass

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iPadOS and Multitasking

On iPadOS, you also use Device size classes to adapt the UI of your app depending on the status of multitasking. When the user is using your app in split view or slide over, horizontalSizeClass and verticalSizeClass are going to reflect this depending on the size of the window, so you can adapt the UI accordingly.

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