I am unable to rotate the image by 90 degrees in swift. I have written below code but there is an error and doesn't compile
func imageRotatedByDegrees(oldImage: UIImage, deg degrees: CGFloat) -> UIImage {
//Calculate the size of the rotated view's containing box for our drawing space
let rotatedViewBox: UIView = UIView(frame: CGRect(x: 0, y: 0, width: oldImage.size.width, height: oldImage.size.height))
let t: CGAffineTransform = CGAffineTransform(rotationAngle: degrees * CGFloat(M_PI / 180))
rotatedViewBox.transform = t
let rotatedSize: CGSize = rotatedViewBox.frame.size
//Create the bitmap context
UIGraphicsBeginImageContext(rotatedSize)
let bitmap: CGContext = UIGraphicsGetCurrentContext()!
//Move the origin to the middle of the image so we will rotate and scale around the center.
bitmap.translateBy(x: rotatedSize.width / 2, y: rotatedSize.height / 2)
//Rotate the image context
bitmap.rotate(by: (degrees * CGFloat(M_PI / 180)))
//Now, draw the rotated/scaled image into the context
bitmap.scaleBy(x: 1.0, y: -1.0)
bitmap.draw(oldImage, in: CGRect(origin: (x: -oldImage.size.width / 2, y: -oldImage.size.height / 2, width: oldImage.size.width, height: oldImage.size.height), size: oldImage.cgImage))
let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return newImage
}
below is the code i am not sure about
bitmap.draw(oldImage, in: CGRect(origin: (x: -oldImage.size.width / 2, y: -oldImage.size.height / 2, width: oldImage.size.width, height: oldImage.size.height), size: oldImage.cgImage))
set ImageView image
ImageView.transform = ImageView.transform.rotated(by: CGFloat(M_PI_2))
Swift 5
ImageView.transform = ImageView.transform.rotated(by: .pi) // 180˚
ImageView.transform = ImageView.transform.rotated(by: .pi / 2) // 90˚
ImageView.transform = ImageView.transform.rotated(by: .pi * 1.5) // 270˚