swiftuikitios10image-rendering

Rotate image with UIGraphicsImageRenderer?

UIGraphicsImageRenderer was newly introduced in iOS 10. I was wondering if there is any possibility to rotate an UIImage with it (any custom angle). I know there is the classic way with CGContextRotateCTM.

Solution

  • You can setup UIGraphicsImageRenderer to create an image and with that call the UIGraphicsGetCurrentContext() and rotate the context

    let renderer = UIGraphicsImageRenderer(size:sizeOfImage)
let image = renderer.image(actions: { _ in
    let context = UIGraphicsGetCurrentContext()

    context?.translateBy(x: orgin.x, y: orgin.y)
    context?.rotate(by: angle)
    context?.draw(image.cgImage!, in: CGRect(origin: CGPoint(x: -orgin.x,y: -orgin.y), size: size))
}
return image