Question

我一直在使用Firebase指南将用户图像上传到Firebase存储，但是在上传用户图像后，文件夹中没有任何内容。如何解决此问题，以成功将图像上传到Firebase存储中，我还缺少什么？

大小0字节

let storage = Storage.storage()
        let storageRef = storage.reference()
         let image = UIImage(named: "ProfileImage")
       let data = Data()
         let starsRef = storageRef.child("ProfileImage.jpeg")
        let metadata = StorageMetadata()
        metadata.contentType = "ProfileImage/jpeg"
        let uploadTask = starsRef.putData(data, metadata: nil) { (metadata, error) in
         guard let metadata = metadata else {
           return
         }

         let size = metadata.size

         starsRef.downloadURL { (url, error) in
           guard let downloadURL = url else {

             return
           }
         }
       }

Answer 1

关于将图像上传到Firebase存储并检索URL路径以供以后使用的步骤，这里有6个步骤。

使用UUID().uuidString
将图像压缩到compressionQuality
将metaData设置为.jpeg
将数据添加到Firebase存储
如果成功，则获取图像URL

将URL转换为url?.absoluteString并使用print

打印出来

    //1. Create an unique name for your image
    let imageName = UUID().uuidString
    let imageReference = Storage.storage().reference().child(imageName)

    //2. Compress quality
    if let uploadData = self.tempImageView.image!.jpegData(compressionQuality: 0.5){

        //3. Save image as .jpeg
        let metaDataForImage = StorageMetadata()
        metaDataForImage.contentType = "image/jpeg"

        //4. Add the data to Firebase Storage
        imageReference.putData(uploadData, metadata: metaDataForImage) { (meta, err) in
            if let err = err{
                print(err.localizedDescription)
            }
            else{
                //5. Retrieving the image URL
                imageReference.downloadURL { (url, err) in
                    if let err = err{
                        print(err.localizedDescription)
                    }
                    else{
                        //6. Print the complete URL as string
                        let urlString = url?.absoluteString
                        print(urlString)
                    }
                }
            }
        }
    }

Answer 2

将let data设为guard let data，这样一来，当您需要非可选选项时，就不必强行拆包。我说一般来说通常避免用力展开。

Answer 3

contentType应该是image/jpeg。我googled some piece codes，它显示了相同的概念。
关于contentType，more detail at this wiki link。
如果您上载jpeg格式的图像，则应该上载jpeg二进制文件。但是data = image.pngData()似乎是png的二进制数据。

// data is `png` binary
let data = image.pngData()
// imageData is `jpeg` binary 
let imageData = image.jpegData(compressionQuality: 0.9)
let uiImage: UIImage = UIImage(data: imageData!)!

 let starsRef = storageRef.child("ProfileImage.jpg")
let metadata = StorageMetadata()

// About contentType
// See it: https://en.wikipedia.org/?title=Content_type&redirect=no 
metadata.contentType = "ProfileImage/jpeg"

// data is `png` binary, but contentType is `jpeg` ? 
let uploadTask = starsRef.putData(data!, metadata: nil) { (metadata, error) in
 guard let metadata = metadata else {
   return
 }

将图像上传到Firebase存储

3 个答案: