Reference the Apple Human Interface Guidelines and download Sketch UI resources  at developer.apple.com/design/human-interface-guidelines. Review iPhone X iOS User Interaction macOS User Interaction & Visual Index tvOS See Apple Technologies, for instance, Airplay, Apple Pay, HealthKit, iCloud, ResearchKit, and Wallet.

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First Principles of Interaction Design by Bruce Tognazzini Aesthetics Anticipation Autonomy Color Consistency Defaults Discoverability Efficiency of the User Explorable Interfaces Fitts’s Law Human-Interface Objects Latency Reduction Learnability Metaphors Protect Users’ Work Readability Simplicity State: Track it Visible Interfaces

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Touch Target Sizes People interact with touch-based user interfaces with their fingers. So user interface controls have to be big enough to capture fingertip actions without frustrating users with erroneous actions and tiny targets. Ok, so how big? — by Luke Wroblewski

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