NEW! Master Swift design patterns with my latest book! >>

How to find the rotation from a CGAffineTransform

Paul Hudson       @twostraws

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…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Get my latest video for free

Learn about value types, functional programming, and protocol-oriented programming in this new video – it's free!

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>