swift - 使用 Swift 从 Firebase 存储中检索图像

Question

我正在寻找从 Firebase 存储中检索图像的从头到尾的代码示例，只是为了显示图像。作为 ImageView 或表格。我看过这里的帖子和各种教程。总感觉少了什么。如果我能看到全貌，我就能更好地把握这一点。

所附代码是我目前尝试将 photo1 从本地更改为从 Firebase 存储中提取。

import UIKit
import Firebase
import FirebaseAuth
import FirebaseStorage
import FirebaseDatabase

class MainMenuTableViewController: UITableViewController {



var mainMenu = [Menu]()
var photo1 = UIImage()
override func viewDidLoad() {
    super.viewDidLoad()
    loadMenu()
}

func loadMenu() {

    let storage = FIRStorage.storage()
    // Create a storage reference from the URL
    let storageRef = storage.referenceForURL("https://firebasestorage.googleapis.com/v0/b/medicalpatientapp-7fd45.appspot.com/o/iconimages%2Ffile-medical-icons.png?alt=media&token=c95b9c51-67ae-4e93-b63c-62091015a9ff")
    // Download the data, assuming a max size of 1MB (you can change this as necessary)
    storageRef.dataWithMaxSize(1 * 1024 * 1024) { (data, error) -> Void in
        // Create a UIImage, add it to the array
        let pic = UIImage(data: data!)
        self.photo1 = pic!

    }


   //let photo1 = UIImage(named: "iconimages-file-medical-icons")!
    let menu1 = Menu(name: "My Notes", photo: photo1)!

    let photo2 = UIImage(named: "iconimages-file-medical-icons")!
    let menu2 = Menu(name: "View Patients", photo: photo2)!

    let photo3 = UIImage(named: "iconimages-add-medical-icons")!
    let menu3 = Menu(name: "Add Persons", photo: photo3)!

    mainMenu += [menu1, menu2, menu3]

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return mainMenu.count
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {


    // Configure the cell...
    let cellIdentifier = "MenuTableViewCell"
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! MainMenuTableViewCell

    // Fetches the appropriate meal for the data source layout.
    let menu = mainMenu[indexPath.row]

    cell.menuLabel.text = menu.name
    cell.menuImage.image = menu.photo

    return cell
}

Answer 1

我们强烈建议结合使用 Firebase 存储和 Firebase 实时数据库来实现这一目标。这是一个完整的例子:

共享:

// Firebase services
var database: FIRDatabase!
var storage: FIRStorage!
...
// Initialize Database, Auth, Storage
database = FIRDatabase.database()
storage = FIRStorage.storage()
...
// Initialize an array for your pictures
var picArray: [UIImage]()

上传:

let fileData = NSData() // get data...
let storageRef = storage.reference().child("myFiles/myFile")
storageRef.putData(fileData).observeStatus(.Success) { (snapshot) in
  // When the image has successfully uploaded, we get it's download URL
  let downloadURL = snapshot.metadata?.downloadURL()?.absoluteString
  // Write the download URL to the Realtime Database
  let dbRef = database.reference().child("myFiles/myFile")
  dbRef.setValue(downloadURL)
}

下载:

let dbRef = database.reference().child("myFiles")
dbRef.observeEventType(.ChildAdded, withBlock: { (snapshot) in
  // Get download URL from snapshot
  let downloadURL = snapshot.value() as! String
  // Create a storage reference from the URL
  let storageRef = storage.referenceFromURL(downloadURL)
  // Download the data, assuming a max size of 1MB (you can change this as necessary)
  storageRef.dataWithMaxSize(1 * 1024 * 1024) { (data, error) -> Void in
    // Create a UIImage, add it to the array
    let pic = UIImage(data: data)
    picArray.append(pic)
  })
})

有关详细信息，请参阅 Zero to App: Develop with Firebase , 它是 associated source code ，有关如何执行此操作的实际示例。