UnsafePointer<CGAffineTransform> from CGAffineTransform
I've also tried passing &transform directly into CGPathCreateWithRect ...
You were almost there. transform needs to be a variablein order to pass it as an inout argument with &:
var transform = CGAffineTransformIdentitylet path = CGPathCreateWithRect(CGRect(...), &transform)For more information, see "Interacting with C APIs"in the "Using Swift with Cocoa and Objective-C" documentation.
In Swift 3 this would be
var transform = CGAffineTransform.identitylet path = CGPath(rect: rect, transform: &transform)or, for the identity transform, just
let path = CGPath(rect: rect, transform: nil)
@Martin R provides the best answer, but as an alternative, I like to use my unsafe mutable pointers this way, in case you need to alter the actual pointer in the future
let path = withUnsafeMutablePointer(&transform){ CGPathCreateWithRect(CGRect(...), UnsafeMutablePointer($0))}