I've been looking for this answer for a long time. Patrick's comments finally help me solve this. Override layoutSubviews() in the hosted UIView:
override func layoutSubviews() {
setNeedsDisplay()
}
It's still not ideal because iOS redraws the view initially by stretching a cached copy of the rendered view to match the new bounds, and then its gets redrawn correctly after layoutSubviews() is called.
connollytom
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