使用 getData() 从 Firebase 存储下载 jpeg 图像时出现错误 13010“对象不存在”

Question

语言：Swift 5

iOS：13.2

ma​​cOS：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;
    }
  }
}

上传图片并保存下载地址的代码：（效果很好，因为我可以看到上传到存储的图片以及它们各自的下载地址存储到实时数据库。）

        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)
                    }
                }
            }
        }

图片下载代码：

        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：

错误域=FIRStorageErrorDomain 代码=-13010 "对象 https:/firebasestorage.googleapis.com/v0/b/trainer-8cb52.appspot.com/o/WORKOUTDATA%2FUSERS%2F1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2FPicture1。 jpg?alt=media&token=785ab8c7-1e08-4ad3-a542-c9e6313eb547 不存在。” UserInfo={object=https:/firebasestorage.googleapis.com/v0/b/trainer-8cb52.appspot.com/o/WORKOUTDATA%2FUSERS%2F1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2F5%2FWORKOUTPICTURES%2FPicture1.jpg?alt=media&token=785ab8c7- 1e08-4ad3-a542-c9e6313eb547，响应体={ “错误”： { “代码”：404， "message": "未找到。无法获取对象", “状态”：“GET_OBJECT” } }，bucket=trainer-8cb52.appspot.com，数据={长度=115，字节=0x7b0a2020 22657272 6f72223a 207b0a20 ... 54220a20 207d0a7d}，data_content_type=application/json； charset=UTF-8, NSLocalizedDescription=对象 https://firebasestorage.googleapis.com/v0/b/trainer-8cb52.appspot.com/o/WORKOUTDATA%2FUSERS%2F1K7WV1alYIeWPAsFC6YMoJKPFSj1%2FWHITEBOARDWORKOUTS%2F5%2FWORKOUTPICTURES%2FPicture1.jpg ?alt=media&token=785ab8c7-1e08-4ad3-a542-c9e6313eb547 不存在。， ResponseErrorDomain=com.google.HTTPStatus, ResponseErrorCode=404}

到目前为止我所做的尝试：

1. 已检查 Firebase 存储规则。
2. 当我在 chrome 浏览器窗口中粘贴路径 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 时，会打开预期的图像。
3. 将 maxSize 设置为一个高得离谱的数字 1*2000000*2000000。

谢谢！

Answer 1

您是否有可能将完整的 https URL 存储在数据库中，并尝试通过将完整的 https url 作为子项添加到存储引用来创建引用？

我认为您应该尝试仅将路径和名称存储在数据库中，或者您将下载代码更改为使用 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: ...

您还在DispatchQueue.main.async 中运行您的getData 方法。 getData 本身有一个完成处理程序，可能需要一些时间，当您在 DispatchQueue.main.async 内运行它时，它会阻止您的代码，直到下载完成。只将更新 UI 的代码放在 DispatchQueue.main.async 中。在你的情况下，只要你对你的锻炼图片数组或 UIImage 做一些事情来更新你的视图。

看看这里，看看你是否能弄清楚你实际上是如何尝试获取数据的。在每行之后放置一个 print() 可能会有所帮助，以查看您在什么时候创建和使用了什么。

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