Metaphors · They work well in iOS because people physically interact with the screen. They move views out of the way to expose content beneath. They drag and swipe content. They toggle switches, move sliders, and scroll through picker values. They even flick through pages of books and magazines.

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Apple Human Interface Guidelines

Apple design principles
Design
Apple
Guidelines
iOS
Human interface

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Janet Evanovich
ring the last year's crop. - George Eliot