arrays - firestore - Recupera todos los valores de un secundario en Firebase con Swift iOS

firestore push to array

Question

Estoy intentando recuperar todos los valores del secundario secundario de Firebase para mostrarlos en una etiqueta en la vista de colección. Tengo que obtener conexiones a una celda de vista de colección y tener un controlador de vista con una imagen y tres etiquetas. En la última etiqueta, quiero obtener todo el valor de precio de firebase child.

Estructura de Firebase

ViewController

Recuperando valores

  import UIKit
  import  Firebase
 class CakeViewController:  UIViewController , UICollectionViewDelegate,   UICollectionViewDataSource {

@IBOutlet weak var manuCake: UIBarButtonItem!

@IBOutlet weak var cakeCollectionView: UICollectionView!


struct cakeObject {

    var cakeImage : UIImage
    var cakeEnglichName: String
    var cakeUrduName : String
    var cakeRate : String
    var key : String



}

var cakeArray : [cakeObject] = []



override func viewDidLoad() {
    super.viewDidLoad()

    manuCake.target = revealViewController()
    manuCake.action = #selector(SWRevealViewController.revealToggle(_:))
    self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())



    let ref = FIRDatabase.database().reference().child("Hyderabad").child("Bakery").child("Cake")

    ref.observeSingleEvent(of: .value, with: { (snapshot) in
        if snapshot.exists() {


            print(snapshot.value as Any)
            let cakeData = snapshot.value as! [String:String]
                for (key,value) in cakeData{
                    //Can set cakeImage and cakeUrduName as per your project
                    cakeArray.append(cakeObject(cakeImage: #imageLiteral(resourceName: "bakery_almond_cake"),cakeEnglinhName: key, cakeUrduName: "آلمنڑ کیک", cakeRate: "/(value)/kg"))
                }
                self.cakeCollectionView.reloadData()
            }

    })



    cakeCollectionView.delegate = self
    cakeCollectionView.dataSource = self

    // Do any additional setup after loading the view.
}





func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return cakeArray.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CakeCollectionViewCell", for: indexPath)
        as! CakeCollectionViewCell

    cell.cakeImageView.image = cakeArray[indexPath.item].cakeImage
    cell.cakeEngLabs.text = cakeArray[indexPath.item].cakeEnglichName
    cell.cakeUrLabs.text = cakeArray[indexPath.item].cakeUrduName
    cell.cakeRateLabs.text =  cakeArray[indexPath.item].key

    return cell

}



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

}

último error

Otra forma de la misma clase

 import UIKit
 import  Firebase
 class CakeViewController:  UIViewController , UICollectionViewDelegate,   UICollectionViewDataSource {

@IBOutlet weak var manuCake: UIBarButtonItem!

@IBOutlet weak var cakeCollectionView: UICollectionView!


struct cakeObject {

    var cakeImage : UIImage
    var cakeEnglichName: String
    var cakeUrduName : String
    //var cakeRate : String
    var key : String



}

var cakeArray : [cakeObject] = []



override func viewDidLoad() {
    super.viewDidLoad()

    manuCake.target = revealViewController()
    manuCake.action = #selector(SWRevealViewController.revealToggle(_:))
    self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())



    let ref = FIRDatabase.database().reference().child("Hyderabad").child("Bakery").child("Cake").child("Almond_Cake")

    ref.observeSingleEvent(of: .value, with: { (snapshot) in
        if snapshot.exists() {


            print(snapshot.value as Any)
             let cakeData = snapshot.value as! [String:String]
                for (key,value) in cakeData{
                    //Can set cakeImage and cakeUrduName as per your project
                    self.cakeArray.append(cakeObject(cakeImage: #imageLiteral(resourceName: "bakery_almond_cake"),cakeEnglichName: key, cakeUrduName: "آلمنڑ کیک", key: "/(value)/kg"))
                }
                self.cakeCollectionView.reloadData()
            }
       })



    cakeCollectionView.delegate = self
    cakeCollectionView.dataSource = self

    // Do any additional setup after loading the view.
}





func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return cakeArray.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CakeCollectionViewCell", for: indexPath)
        as! CakeCollectionViewCell

    cell.cakeImageView.image = cakeArray[indexPath.item].cakeImage
    cell.cakeEngLabs.text = cakeArray[indexPath.item].cakeEnglichName
    cell.cakeUrLabs.text = cakeArray[indexPath.item].cakeUrduName
    cell.cakeRateLabs.text =  cakeArray[indexPath.item].key

    return cell

}



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

}

Otro error de formas

Answer 1

Escribí una nueva clase y una nueva función de búsqueda. Vea cómo esto funciona para usted,

class CakeData {
   var cakeImage : UIImage?
   var cakeEnglichName: String?
   var cakeUrduName : String?
   //var cakeRate : String
    var key : String?
 init(postKey: String, postData: Dictionary <String, Any>) {
       self.key = postKey

       //Don''t forget to add your keys
       if let cakeImage   = postData["addKey"] {
          self.cakeImage = cakeImage as? UIImage
       }
       if let cakeEnglichName = postData["addKey"] {
          self.cakeEnglichName = cakeEnglichName as? String
       }
       if let cakeUrduName = postData["addKey"] {
          self.cakeUrduName = cakeUrduName as? String
       }
     }

Función Fetch,

func fetchCakeData() {
    let ref = FIRDatabase.database().reference()
ref.child("Hyderabad").child("Bakery").child("Cake").observeSingleEvent(of: FIRDataEventType.value, with: { (snapshot) in
       if let cakeSnapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
           for cakes in cakeSnapshot {
               if let cakeDictionary = cakes.value as? Dictionary <String, Any> {
                   let key = cakes.key as String
                   //your class that takes a key as String and a Dictionary
                   let post = CakeData(postKey:key, postData: cakeDictionary)
                   self.cakeArray.append(post)
               }
           }
       }
      cakeCollectionView.delegate = self
     cakeCollectionView.dataSource = self
   })
}

aquí está de acuerdo con tu código,

import UIKit
import Firebase

struct cakeObject {
    var cakeImage : UIImage
    var cakeEnglichName: String
    var cakeUrduName : String
    // var cakeRate : String
    var key : String
}
class CakeData {
    var cakeImage : UIImage?
    var cakeEnglichName: String?
    var cakeUrduName : String?
    //var cakeRate : String
    var key : String?
    init(postKey: String, postData: Dictionary <String, Any>) {
        self.key = postKey

        //Don''t forget to add your keys
        if let cakeImage   = postData["addKey"] {
            self.cakeImage = cakeImage as? UIImage
        }
        if let cakeEnglichName = postData["addKey"] {
            self.cakeEnglichName = cakeEnglichName as? String
        }
        if let cakeUrduName = postData["addKey"] {
            self.cakeUrduName = cakeUrduName as? String
        }
    }
}


class CakeViewController: UIViewController , UICollectionViewDelegate, UICollectionViewDataSource {

    @IBOutlet weak var manuCake: UIBarButtonItem!
    @IBOutlet weak var cakeCollectionView: UICollectionView!
    var cakeArray: [CakeData] = []
// var cakeArray : [cakeObject] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        manuCake.target = revealViewController()
        manuCake.action = #selector(SWRevealViewController.revealToggle(_:))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
        self.cakeCollectionView.delegate = self
        self.cakeCollectionView.dataSource = self
    }

    override func viewWillAppear(_ animated: Bool) {
        fetchCakeData()
    }

    func fetchCakeData() {
        let ref = FIRDatabase.database().reference()
        ref.child("Hyderabad").child("Bakery").child("Cake").observeSingleEvent(of: FIRDataEventType.value, with: { (snapshot) in
            if let cakeSnapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
                for cakes in cakeSnapshot {
                    if let cakeDictionary = cakes.value as? Dictionary <String, Any> {
                        let key = cakes.key as String
                        //your class that takes a key as String and a Dictionary
                        let post = CakeData(postKey:key, postData: cakeDictionary)
                        self.cakeArray.append(post)
                    }
                }
            }
            self.cakeCollectionView.reloadData()
        })
    }




 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return cakeArray.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CakeCollectionViewCell", for: indexPath)
            as! CakeCollectionViewCell

        cell.cakeImageView.image = cakeArray[indexPath.item].cakeImage
        cell.cakeEngLabs.text = cakeArray[indexPath.item].cakeEnglichName
        cell.cakeUrLabs.text = cakeArray[indexPath.item].cakeUrduName
        cell.cakeRateLabs.text = cakeArray[indexPath.item].key



        print("Cake : /(cakeArray[indexPath.row])")
        cell.cakeImageView.image = cakeArray[indexPath.item].cakeImage
        cell.cakeEngLabs.text = cakeArray[indexPath.item].cakeEnglichName


        return cell 
    }


}

Answer 2

está obteniendo el error debajo ya que el valor no es una matriz del diccionario, el valor es una cadena.

if let cake = snapshot.value![a] as? [[String:String]]

debería ser

if let cake = snapshot.value![a] as? String

No veo el uso de fruitArray después de asignar la tasa de torta en fruitArray

Le sugiero que complete cakeArray como el siguiente código:

print(snapshot.value as Any)
let cakeData = snapshot.value as! [String:String]
    for (key,value) in cakeData{
           //Can set cakeImage and cakeUrduName as per your project
           cakeArray.append(cakeObject(cakeImage: #imageLiteral(resourceName: "bakery_almond_cake"),cakeEnglinhName: key, cakeUrduName: "آلمنڑ کیک", cakeRate: "/(value)/kg"))                  
      }
    self.cakeCollectionView.reloadData()

Segundo error : no veo ningún objeto como clave en Cake struct. Entonces el compilador da error. Estás asignando valor en la línea anterior para cakeRateLabs . Así que no hay necesidad de volver a asignar simplemente eliminar / comentar cell.cakeRateLabs.text = cakeArray[indexPath.item].key .

Espero que esto solucione tu error y obtenga resultados como lo desees.