如何在Firebase存储器中存储图像并将链接保存到数据库中? [英] How to store images in firebase storage and save link to them on database?

问题描述

我已经到处寻找答案.我最接近的是此处但是，它不能完全回答我的问题.也就是说，如何在数据库中存储对保存在Firebase存储中的图像的引用.

I have looked around for an answer to this. The closest I got is here, however, It does not exactly answer my question. That being, how to store a reference to images which are saved in firebase storage, in the database.

下面是我尝试过的代码.上传时可以存储一张图像，但是我不确定通过存储参考来表示这是什么意思.

Below is the code I have tried. It is able to store one image when uploaded but I am unsure as to whether this is what they mean by storing the reference.

if let imageData = UIImageJPEGRepresentation(image, 0.8) {
    let metadata = storageRef //.child("poop/")

    let uploadTask = metadata.putData(imageData, metadata: nil) {
         (metadata, error) in
        guard let metadata = metadata else {
            // Uh-oh, an error occurred!
            return
        }

        // You can also access to download URL after upload.
        storageRef.downloadURL { 
            (url, error) in
            guard let downloadURL = url else {
                // Uh-oh, an error occurred!
                return
            }
            //let imgURL = url

            //database integration
            let ref = Database.database().reference()
            let usersRef = ref.child("usersPosts")

            let uid = Auth.auth().currentUser?.uid
            let newUserRef = usersRef.child(uid!)
            //creates a child for email and password (i think we shud store password so we can tell sumone what it is inmediatly, maybe)
            newUserRef.setValue(["Image": "\(downloadURL)"])
        }

    }

    //            let imgURL = storageRef.downloadURL
    //
    //            //database integration
    //            let ref = Database.database().reference()
    //            let usersRef = ref.child("usersPosts")
    //
    //            let uid = Auth.auth().currentUser?.uid
    //            let newUserRef = usersRef.child(uid!)
    //            //creates a child for email and password (i think we shud store password so we can tell sumone what it is inmediatly, maybe)
    ////                newUserRef.setValue(["Image": "\(imgURL)"])





    // For progress
    uploadTask.observe(.progress, handler: { (snapshot) in
        guard let progress = snapshot.progress else {
        return
    }

    let percentage = (Float(progress.completedUnitCount) / Float(progress.totalUnitCount))
    progressBlock(Double(percentage))
    })

} else {
    completionBlock(nil, "Image could not be converted to Data.")
}

感谢您的帮助！

推荐答案

请根据需要修改您的代码

Please modify your code as required

var imgData: NSData = NSData(data: UIImageJPEGRepresentation((self.img_Photo?.image)!, 0.8)!)
self.uploadProfileImageToFirebase(data: imgData)


func uploadProfileImageToFirebase(data:NSData){
    let storageRef = Storage.storage().reference().child("usersPosts").child("\(uid).jpg")
    if data != nil {
        storageRef.putData(data as Data, metadata: nil, completion: { (metadata, error) in
            if(error != nil){
                print(error)
                return
            }
            guard let userID = Auth.auth().currentUser?.uid else {
                return
            }
            // Fetch the download URL
            storageRef.downloadURL { url, error in
                if let error = error {
                    // Handle any errors
                    if(error != nil){
                        print(error)
                        return
                    }
                } else {
                    // Get the download URL for 'images/stars.jpg'

                    let urlStr:String = (url?.absoluteString) ?? ""
                    let values = ["downloadURL": urlStr]
                    self.addImageURLToDatabase(uid: userID, values: values as [String : AnyObject])
                }
            }
        })
    }

}


func addImageURLToDatabase(uid:String, values:[String:AnyObject]){
    let ref = Database.database().reference(fromURL: "https://exampleapp.firebaseio.com/")
    let usersReference = ref.child("usersPosts").child((Auth.auth().currentUser?.uid)!)

    usersReference.updateChildValues(values) { (error, ref) in
        if(error != nil){
            print(error)
            return
        }
        self.parentVC?.dismiss(animated: true, completion: nil)
    }

}

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