iOS Human Interface Guidelines: Layout
Make it easy for people to interact with content and controls by giving each interactive element ample spacing. Give tappable controls a hit target of about 44 x 44 points.
So if you’re designing something for iOS, please for God’s sake, stop designing 18-pixel tall buttons.
I’m looking at you, Apple’s ‘delete application’ button in the home page…
I just checked in the iOS simulator, and it seems like the delete app buttons actually do have a 44pt hit box, they just look smaller.
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