What size UIToolbarbutton's icon should be?

StackOverflow https://stackoverflow.com/questions/20616353

题

I'm trying to create a tool bar like below image. Surely I have different buttons and also different icons. But the question is that what size should be the icons that I will use for this buttons?

enter image description here

有帮助吗？

解决方案

Apple has extensive and very specific guidelines for icons and images in it's iOS Human Interface Guidelines.

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