Oddly, View designed in IB would have FlexibleWidth+FlexibleHeight set in it autoresizingMask, even if you cleared everything in auto resizing box, regardless using AutoLayout or not. The behavior causes that subviews inside item view have wrong positions after transform3D with rotations. In short, item view’s width/height in subviews position/constraints calculation would be calculated as rotated value instead of  preset value, 

The solution is put self.autoresizingMask = 0 to awakeFromNib, easiest? But it took me 1.5 days to find the reason.

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