iOS 調整UIImage圖片大小

    // 重設圖片大小
    func reSizeImage(reSize : CGSize) -> UIImage {
        //UIGraphicsBeginImageContext(reSize);
        UIGraphicsBeginImageContextWithOptions(reSize, false, UIScreen.main.scale)
        self.draw(in: CGRect(x: 0, y: 0, width: reSize.width, height: reSize.height))
        let reSizeImage : UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return reSizeImage
    }