当使用getData()从Firebase存储中下载jpeg图片时，出现错误13010 "对象不存在"。

Question

语种 : Swift 5

iOS: 13.2

macOS: Catalina 10.15.4

Firebase存储规则。

service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
      allow read, write: if request.auth!=null;
    }
  }
}

上传图片和保存下载URL的代码。 (这很好用，因为我可以看到上传到存储区的图片 和它们各自的下载URL存储到实时数据库)

        let storageRef = Storage.storage().reference()

        //Let's upload all workout pictures
        let uploadPicsRef = 
        storageRef.child("WORKOUTDATA/USERS/"+self.UID!).child("WHITEBOARDWORKOUTS")

        let uploadNumberRef = uploadPicsRef.child("\(String(describing: workoutNum))")
        let workoutPicturesRef = uploadNumberRef.child("WORKOUTPICTURES")
        let workoutPicURLRef = workoutRef.child("WORKOUTPICTURESURL")
        var count = 0
        var picNumber = 0

        //workoutPictures list/array contains images selected from iPhone Gallery, using 
        //UIImagePickerController
        for workoutPic in self.workoutPictures
        {
            let workoutPicData = workoutPic.jpegData(compressionQuality: 1.0)!
            count = count + 1
            let pictureName = "Picture\(count).jpg"

            // Upload the file to the path in pictureRef
            let pictureRef = workoutPicturesRef.child("\(pictureName)")

            let metaData = StorageMetadata()
            metaData.contentType = "image/jpg"
            pictureRef.putData(workoutPicData, metadata: metaData) { (metadata, error) in
                if error != nil {
                    print("Error while uploading image")
                }
                else
                {
                    pictureRef.downloadURL { (url, err) in
                        picNumber = picNumber + 1
                        workoutPicURLRef.child("Picture\(picNumber)").setValue(url?.absoluteString)
                    }
                }
            }
        }

下载图片的代码。

        let myGroup = DispatchGroup()

        let workoutPicUrls = snapshot.childSnapshot(forPath: "WORKOUTPICTURESURL")

        for url in workoutPicUrls.children
        {
            myGroup.enter()
            let snap = url as! DataSnapshot
            let link = snap.value as? String
            let storageRef = Storage.storage().reference()
            let pictureRef = storageRef.root().child(link!)

            DispatchQueue.main.async {
                pictureRef.getData(maxSize: 1*2000000*2000000) { (data, err) in
                if (err != nil) {
                    print(err!)
                    print(err!.localizedDescription)

                } else {
                let pic = UIImage(data: data!)
                workoutPicsArray.append(pic!)
                myGroup.leave()
                }
            }
            }
        }

错误：

Error Domain=FIRStorageErrorDomain Code=-13010 "Object https:firebasestorage.googleapis.comv0btrainer-8cb52.appspot. comoWORKOUTDATA%2FUSERS%2F1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2FPicture1.jpg?alt=media&token=785ab8c7-1e08-4ad3-a542-c9e6313eb547不存在。" UserInfo={object=https:firebasestorage.googleapis.comv0btrainer-8cb52.appspot.comoWORKOUTDATA%2FUSERS%2F1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2FPicture1. jpg?alt=media&token=785ab8c7-1e08-4ad3-a542-c9e6313eb547, ResponseBody={ "error": "code": 404, "message": "Not Found.Can not get object", "状态": { "code": 404, "message": "Not Found. 无法获取对象", "status": "GET_OBJECT" } }, bucket=trainer-8cb52.appspot.com, data={length = 115, bytes = 0x7b0a2020 22657272 6f72223a 207b0a20 ... ... 54220a20 207d0a7d }, data_content_type=applicationjson; charset=UTF-8, NSLocalizedDescription=......。Object https:firebasestorage.googleapis.comv0btrainer-8cb52.appspot.comoWORKOUTDATA%2FUSERS%2FF1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2FFPicture1. jpg?alt=media&token=785ab8c7-1e08-4ad3-a542-c9e6313eb547不存在。 ResponseErrorDomain=com.google.HTTPStatus, ResponseErrorCode=404}。

到目前为止，我已经尝试了什么。

1. 检查了firebase的存储规则
2. 当我粘贴路径 https:/firebasestorage.googleapis.com/v0/b/trainer8cb52.appspot.com/o/WORKOUTDATA%2FUSERS%2F1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2FPicture1.jpg?alt=media&token=785ab8c7-1e08-4ad3-a542-c9e6313eb547 在chrome浏览器窗口中，打开预期的图片。
3. 把maxSize设置成一个高得离谱的数字1*2000000*2000000。

谢谢你

Answer 1

是否有可能你在数据库中存储了完整的https URL，并试图通过将完整的https URL作为子节点添加到存储引用中来创建引用？

我认为你应该尝试在数据库中只存储路径和名称，或者你改变你的下载代码来使用https URL。

       // Create a reference from an HTTPS URL
       // Note that in the URL, characters are URL escaped!
       let httpsReference = storage.reference(forURL: "https://firebasestorage.googleapis.com/b/bucket/o/images%20stars.jpg")

       httpsReference.getData(maxSize: ...

另外，你在你的getData方法里面运行了 DispatchQueue.main.async...getData本身有一个完成处理程序，可能需要一些时间，当你在 DispatchQueue.main.async 它将阻止你的代码，直到下载完成。只把更新UI的代码放在 DispatchQueue.main.async. 在你的情况下，只要你对你的workoutPicsArray或UIImage做一些事情，更新你的视图。

看一下这里，看看你是否能弄清楚你到底是如何获取数据的。在每一行之后放一个print()可能会有帮助，以查看你在什么时候创建和使用什么。

在iOS上下载文件