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> we may want to scale certain images or buttons

Start with iPad2 mode. Add some invisible areas around those images and buttons. If the user keeps touching these areas instead of actual UI, switch to iPad Mini mode. This is also good for iPad2 users who have big and/or clumsy fingers.



If you have that space available why not just make it part of the touch target in the first place?


You could do that and keep track of touches that are not very close to the target's center instead. But it seems a bit more complicated to implement.




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