How to find the rotation from a CGAffineTransform
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))
}Available from iOS 2.0
Did this solution work for you? Please pass it on!
Other people are reading…
- How to find the scale from a CGAffineTransform
- How to compare two CGRects with equalTo()
- How to calculate the Manhattan distance between two CGPoints
- How to draw a text string using Core Graphics
- How to draw a circle using Core Graphics: addEllipse(in:)
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Get six books for only $150
The Swift Power Pack includes my first six books for one low price, helping you jumpstart a new career in iOS development – check it out!
