Display.
Ergonomics.
Inputs.
App interactions.
System features.
Best practices
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Help people concentrate on primary tasks and content by limiting the number of onscreen controls while making secondary details and actions discoverable with minimal interaction.
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Adapt seamlessly to appearance changes — like device orientation, Dark Mode, and Dynamic Type — letting people choose the configurations that work best for them.
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Support interactions that accommodate the way people usually hold their device. For example, it tends to be easier and more comfortable for people to reach a control when it’s located in the middle or bottom area of the display, so it’s especially important let people swipe to navigate back or initiate actions in a list row.
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With people’s permission, integrate information available through platform capabilities in ways that enhance the experience without asking people to enter data. For example, you might accept payments, provide security through biometric authentication, or offer features that use the device’s location.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/designing-for-ios