How to find the rotation from a CGAffineTransform
Swift version: 5.0
A CGAffineTransform value combines scale, translation and rotation all at once, but if you just want to know its rotation value is then use this code:
func rotation(from transform: CGAffineTransform) -> Double {
return atan2(Double(transform.b), Double(transform.a))
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Available from iOS 2.0
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