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When I flip UIButton using key path @"transform.rotation.y", I can still see the front side of the UIbutton.
Is there anyway I can hide buttons front view contents and show a plain backside?
No, I believe what you want is not possible. A view or layer does not have a backside that is different from its front – if it did, it would need more properties to set its backside color etc. The
CALayerclass has adoubleSidedproperty. If you set it toNO(button.layer.doubleSided = NO;), the layer is automatically hidden when it faces away from the viewer but that’s probably not what you want.As a workaround, place another view at the same coordinates/frame as your button that has your desired backside color. If you sets this view’s initial rotation transform to 180 degrees, then set both layers to
doubleSided = NOand then rotate both views by 180 degrees, the button should disappear and the other view should appear. Note that I haven’t tried this out.