How to apply multiple transforms in Swift

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You can apply multiple transforms by stacking them on top of each other. 

var t = CGAffineTransform.identity
t = t.translatedBy(x: 100, y: 300)
t = t.rotated(by: CGFloat.pi / 4)
t = t.scaledBy(x: -1, y: 2)
// ... add as many as you want, then apply it to to the view
imageView.transform = t

Or more compactly (but not necessarily as readable):

imageView.transform = CGAffineTransform.identity.translatedBy(x: 100, y: 300).rotated(by: CGFloat.pi / 4).scaledBy(x: -1, y: 2)

This series of transforms produces the image on the right:

enter image description here

Thanks to this answer for teaching me how to do it.

Notes

  • The order in which you apply the transforms matters. For example, if the transforms were done in the opposite order it would produce the following result.

    t = t.scaledBy(x: -1, y: 2)
t = t.rotated(by: CGFloat.pi / 4)
t = t.translatedBy(x: 100, y: 300)

enter image description here

See also

This answer has been tested with Swift 4

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