【问题标题】:swift upload persons image from firebase storage从 Firebase 存储中快速上传人物图像
【发布时间】:2017-11-17 21:25:35
【问题描述】:

我的代码为每个人提供了一个资产图像作为图片,我将如何更改它以使其从 firebase 检索每个人的图像??

import UIKit
import Firebase

class usersScreenVC: UITableViewController {


    let cellId = "cellId"
    var users = [User]()

    override func viewDidLoad() {
        super.viewDidLoad()


        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(handleCancel))

        tableView.register(UserCell.self, forCellReuseIdentifier: cellId)

        fetchUser()
    }




    func fetchUser() {
        FIRDatabase.database().reference().child("Users").observe(.childAdded, with: { (snapshot) in

            if let dictionary = snapshot.value as? [String: AnyObject] {
                let user = User()

                self.users.append(user)

                user.DisplayName =  dictionary["Display Name"] as? String
                user.SubtitleStatus = dictionary["SubtitleStatus"] as? String

                DispatchQueue.main.async {
                    self.tableView.reloadData()
                }

            }

        }, withCancel: nil)
    }



    //
    override      func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return users.count

        }
    //
         override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    //                let cell = UITableViewCell(style: .subtitle, reuseIdentifier: cellId)
    //
            let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)

            let user = users[indexPath.row]
            cell.textLabel?.text = user.DisplayName
            cell.detailTextLabel?.text = user.SubtitleStatus




            cell.imageView?.image = UIImage(named: "Home Button")


            if let profileImageURL = user.profileImageURL{
                let url = URL(string: profileImageURL)


                URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in


                    //this mean download hit an error so lets return out.
                    if error != nil {
                        //print(error)
                        return
                    }


                    DispatchQueue.main.async(execute: {


                    cell.imageView?.image = UIImage(data: data!)

                    })

                }).resume()


            }


            return cell
        }

class UserCell: UITableViewCell {

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: .subtitle, reuseIdentifier: reuseIdentifier)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    }






}//class

【问题讨论】:

    标签: ios swift firebase firebase-realtime-database firebase-storage


    【解决方案1】:

    ** 您需要先将资产图片发送到 firebase **

    在你发送图片的地方调用这个函数

      func uploadImageToFB (image : UIImage){
                    
                    let imageData = UIImageJPEGRepresentation(image, 1.0)
                    let metadata = StorageMetadata()
                    metadata.contentType = "image/jpeg"
                    let imagePath = Auth.auth().currentUser!.uid + "/\(Int(Date.timeIntervalSinceReferenceDate * 1000)).jpg"
        
           //StorageRef is FIRDatabaseRefrence here you need to pass your storage url given in Firebase Console //
        
                    storageRef.child(imagePath).putData(imageData!, metadata: metadata, completion: { (metadata, error) in
                        if let error = error {
                            print("Error uploading photo: \(error)")
                            return
                        }else{
                            let autoID = self.ref.childByAutoId().key
                            print(metadata ?? "")
                            let userID : String = Auth.auth().currentUser!.uid
                            let ImageRef : DatabaseReference = self.statusRef.child(userID)
                        
                            let imageUrls = [
                                "imageUrl" : metadata?.downloadURL()?.absoluteString
                                ] as [String : Any]
                            let userInfo = ["UserID":userID,
                                           "userName":Auth.auth().currentUser!.displayName]
    
       //Here Image Ref is FIRDatabaseRefrence upto the node you need to set your image 
               
        ImageRef.child("UserInfo").updateChildValues(userInfo)
                      
       ImageRef.child("Images").child(autoID).setValue(imageUrls)
                        }
                    })
                }
    

    现在,在从 firebase 获取时,您将获得您的 imageurl 也使用它。

    希望对你有用

    【讨论】:

    • 我的火力库中充满了用户和图像以及图像 url 作为字符串
    • 我不确定那里;虽然当模拟器加载所有图片时没有错误是 cell.imageView?.image = UIImage(named: "Home Button") 图像而不是选择的那个使用上一个 VC 上的图像选择器,我虽然可能等待加载但我等了 5 分钟
    • user.profileImageURL = dictionary["profileImageUrl"] as?字符串
    • 觉得我错过了^
    • 如果您将观察者设置为子更改,则可能会发生这种情况,您需要将时间与图像一起存储,并且在获取时需要根据时间对数组进行排序。
    【解决方案2】:

    我不见了

    user.profileImageURL = 字典["profileImageUrl"] 作为?字符串

    【讨论】:

      【解决方案3】:
        let imageData = UIImageJPEGRepresentation(image , 0.0)
          let storage = Storage.storage()
          let uploadRef = storage.reference().child("images/\(UUID().uuidString).jpg")
          uploadRef.putData(imageData!, metadata: nil) { metadata,
              error in
              if error == nil {
                  print("successfully uploaded Image")
                  url = (metadata?.downloadURL()?.absoluteString)!
                  print("AhmedRabie \(url)")
                  self.activityIndecator.stopAnimating()
      
              }
              else {
                  print("UploadError \(String(describing: error))")
              }
      
          }
      

      【讨论】:

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