上传到Firebase Swift 4时，照片质量会丢失

Question

我试过了

 if let uploadData = UIImageJPEGRepresentation(uploadImage, 0.9){
                let subFileName = NSUUID().uuidString
            storageRef.child("\(subFileName)").putData(uploadData, metadata: nil, completion: { (data , error) in
                if error != nil{
                    print(error!)
                }
            })

我也试过

UIImagePNGRepresentation(uploadImage)

两者都没有产生原始质量的图像，唯一改变的是firebase存储的大小......我也尝试用cgSize更改来改变图像

 func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage {
    let size = image.size

    let widthRatio  = targetSize.width  / image.size.width
    let heightRatio = targetSize.height / image.size.height

    var newSize: CGSize
    if(widthRatio > heightRatio) {
        newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
    } else {
        newSize = CGSize(width: size.width * widthRatio,  height: size.height * widthRatio)
    }

    let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)

    UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
    image.draw(in: rect)
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    return newImage!
}

然而这一切都没有帮助:(我该如何解决这个问题？

我知道图像质量不好，因为当我从firebase控制台的下载URL加载它时质量很差..感谢您的帮助!!