How Can I Rotate A UIImage and Image Data By 90 Degrees

Question

I have a UIImageView that contains an image. At the minute the user can click to save the image within the UIImageView to disk.

I would like to make it so that the the

Answer 1

Swift version made from answer of @RyanG with some fixes:

func rotated(by degrees: CGFloat) -> UIImage {
    let radians : CGFloat = degrees * CGFloat(.pi / 180.0)
    let rotatedViewBox = UIView(frame: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
    let t = CGAffineTransform(rotationAngle: radians)
    rotatedViewBox.transform = t
    let rotatedSize = rotatedViewBox.frame.size
    UIGraphicsBeginImageContextWithOptions(rotatedSize, false, self.scale)
    defer { UIGraphicsEndImageContext() }
    guard let bitmap = UIGraphicsGetCurrentContext(), let cgImage = self.cgImage else {
      return self
    }
    bitmap.translateBy(x: rotatedSize.width / 2, y: rotatedSize.height / 2)
    bitmap.rotate(by: radians)
    bitmap.scaleBy(x: 1.0, y: -1.0)
    bitmap.draw(cgImage, in: CGRect(x: -self.size.width / 2, y: -self.size.height / 2, width: self.size.width, height: self.size.height))
    guard let newImage = UIGraphicsGetImageFromCurrentImageContext() else {
      return self
    }
    return newImage
  }