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To ensure the best experience on Apple Watch, make sure you support the following features:
Always-on display: Some Apple Watch models feature an always-on display, where the watch face remains illuminated at all times. Be prepared to keep your app's content up-to-date when your app is in the Always On state. View Designing your app for the Always On state.
Multiple sizes of Apple Watch: Apple Watch comes in sizes ranging from 38mm to 45mm, and SwiftUI helps you adapt your interface to any device size. Use the simulator to preview your interface and adjust the layout as needed. View Supporting multiple watch sizes.
Dynamic Type: People can ask the system to use a bigger font to make text more readable or a smaller font to fit more information onscreen. Respect these font-size changes by adjusting your app's text too. Adopt standard type styles to make these changes automatically, or use system APIs to manually update text that contains custom fonts. In SwiftUI, get the new text size from the view's environment.
Scalable images: Incorporate SF Symbols to make your app more adaptable to changes. The SF Symbols app offers a vast collection of configurable, vector-based images that adapt naturally to appearance and size changes. They also blend well with the San Francisco system font, resulting in a consistent look across Apple platforms. View Configuring and displaying symbol images in your UI.