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.