hig-components-system
Apple HIG: System Experiences
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Key Principles
General
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Glanceable, immediate value. System experiences bring your app's most important content to surfaces the user sees without launching your app. Design for seconds of attention.
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Respect platform context. A Lock Screen widget has different constraints than a Home Screen widget. A complication is far smaller than a top shelf item.
Widgets
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Show relevant information, not everything. Display the most useful subset, updated appropriately.
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Support multiple sizes with distinct layouts. Each size should be a thoughtful design, not a scaled version of another.
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Deep-link on tap. Take users to the relevant content, not the app's root screen.