【iOS】指定画像の色を変更した新しい画像を生成する

UIImage+DifferentColor.swift

extension UIImage {

    static func differentColor(originalImage: UIImage, color: UIColor) -> UIImage {
        let imageSize = originalImage.size
        let rect = CGRect(origin: .zero, size: imageSize)
        UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
        color.setFill()
        UIRectFill(rect);
        originalImage.draw(in: rect, blendMode: .destinationIn, alpha: 1)
        guard let tmpImage = UIGraphicsGetImageFromCurrentImageContext(), let cgImage = tmpImage.cgImage else {
            return UIImage()
        }
        let image = UIImage(cgImage: cgImage, scale: originalImage.scale, orientation: originalImage.imageOrientation)
        let resultImage = image.resizableImage(withCapInsets: originalImage.capInsets, resizingMode: originalImage.resizingMode)
        UIGraphicsEndImageContext()

        return resultImage
    }
 
}