UIImage resize (Scale proportion)

// grab the original image
UIImage *originalImage = [UIImage imageNamed:@"myImage.png"];
    
// scaling set to 2.0 makes the image 1/2 the size. 
UIImage *scaledImage = 
                [UIImage imageWithCGImage:[originalImage CGImage] 
                              scale:(originalImage.scale * 2.0)
                                 orientation:(originalImage.imageOrientation)];