Swift 4 Retrieving Data From Firebase Database - swift

Question

func retPost2(){
runNBPOST()
////////////////////////////////////1
var pic = [String]()
var p = Post(userId: "", postId: "", postType: "", description: "", Region: "", City: "", District: "", Street: "", Area: 0, View: "", TotalPrice: 0, Pictures: pic, StreetWidth: 0, PropertyType: "")
////// for to retrive all post
print(retNBPOST())
runNBPOST()
let nbpost = retNBPOST()
for i in 1..<nbpost{
postiiD = "Post(\(i))"
self._REF_BASE.child("Post").child(postiiD).observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let UserID2 = value?["UserID"] as? String ?? ""
p.userId = UserID2
})
self._REF_BASE.child("Post").child("\("Post(\(i))")/Adress").observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let Region = value?["Region"] as? String ?? ""
p.Region = Region
let City = value?["City"] as? String ?? ""
p.City = City
print(p.City)
let District = value?["District"] as? String ?? ""
p.District = District
let Street = value?["Street"] as? String ?? ""
p.Street = Street
let AdditionalNumber = value?["AdditionalNumber"] as? String ?? ""
p.AdditionalNumber = AdditionalNumber
let PostalCode = value?["PostalCode"] as? String ?? ""
p.PostalCode = PostalCode
let BuldingNo = value?["BuldingNo"] as? String ?? ""
p.BuldingNo = BuldingNo
})
self._REF_BASE.child("Post").child("\(postiiD)/PostInfo").observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let postType = value?["PostType"] as? String ?? ""
p.postType = postType
print(p.postType)
let DateOfpost = value?["DateOfpost"] as? String ?? ""
p.dateOfpost = DateOfpost
let EndDateOfPost = value?["EndDateOfPost"] as? String ?? ""
p.endDateOfPost = EndDateOfPost
let NbOfShare = value?["NbOfShare"] as? String ?? ""
p.nbOfShare = Int(NbOfShare)!
let NbOfViews = value?["NbOfViews"] as? String ?? ""
p.nbOfViews = Int(NbOfViews)!
let LastUpdate = value?["LastUpdate"] as? String ?? ""
p.lastUpdate = LastUpdate
let Description = value?["Description"] as? String ?? ""
p.description = Description
let Publisher = value?["Publisher"] as? String ?? ""
p.publisher = Publisher
let ContactTime = value?["ContactTime"] as? String ?? ""
p.contactTime = ContactTime
let Payment = value?["Payment"] as? String ?? ""
p.payment = Payment
let TotalPrice = value?["TotalPrice"] as? String ?? ""
p.TotalPrice = Double(TotalPrice)!
let NearBy = value?["NearBy"] as? String ?? ""
p.NearBy = NearBy
let StreetWidth = value?["StreetWidth"] as? String ?? ""
p.StreetWidth = Double(StreetWidth)!
// let Discount = value?["Discount"] as? String ?? ""
// p.Discount =
})
self._REF_BASE.child("Post").child("\(postiiD)/Property").observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let Area = value?["Area"] as? String ?? ""
p.Area = Double(Area)!
print(p.Area)
let View = value?["View"] as? String ?? ""
p.View = View
let FamilyOrSingle = value?["FamilyOrSingle"] as? String ?? ""
p.FamilyOrSingle = FamilyOrSingle
let Level = value?["Level"] as? String ?? ""
p.Level = Int(Level)!
let HouseAge = value?["HouseAge"] as? String ?? ""
p.HouseAge = Int(HouseAge)!
let LandType = value?["LandType"] as? String ?? ""
p.LandType = LandType
let MeterPrice = value?["MeterPrice"] as? String ?? ""
p.MeterPrice = Double(MeterPrice)!
let NbRoom = value?["NbRoom"] as? String ?? ""
p.NbRoom = Int(NbRoom)!
let NbGuestroom = value?["NbGuestroom"] as? String ?? ""
p.NbGuestroom = Int(NbGuestroom)!
let NbBathroom = value?["NbBathroom"] as? String ?? ""
p.NbBathroom = Int(NbBathroom)!
let NbBedroom = value?["NbBedroom"] as? String ?? ""
p.NbBedroom = Int(NbBedroom)!
let NbLivingroom = value?["NbLivingroom"] as? String ?? ""
p.NbLivingroom = Int(NbLivingroom)!
let NbKitchen = value?["NbKitchen"] as? String ?? ""
p.NbKitchen = Int(NbKitchen)!
let PropertyType = value?["PropertyType"] as? String ?? ""
p.PropertyType = PropertyType
let NbApartment = value?["NbApartment"] as? String ?? ""
p.NbApartment = Int(NbApartment)!
})
// complet
self._REF_BASE.child("Post").child("\(postiiD)/Amenities").observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let LiftAvailability = value?["LiftAvailability"] as? String ?? ""
let KitchenAvailability = value?["KitchenAvailability"] as? String ?? ""
let FurnitureAvailability = value?["FurnitureAvailability"] as? String ?? ""
let CarageAvailability = value?["CarageAvailability"] as? String ?? ""
let SwimmingPoolAvailability = value?["SwimmingPoolAvailability"] as? String ?? ""
let ParkingAvailability = value?["ParkingAvailability"] as? String
let FiberOpticAvailability = value?["FiberOpticAvailability"] as? String
let FireplaceAvailability = value?["FireplaceAvailability"] as? String
let DiningroomAvailability = value?["DiningroomAvailability"] as? String
let LaundryAvailability = value?["LaundryAvailability"] as? String
let CentralAirAvailability = value?["CentralAirAvailability"] as? String
let BalconyAvailability = value?["BalconyAvailability"] as? String
let MaidRoomAvailability = value?["MaidRoomAvailability"] as? String
let DriverRoomAvailability = value?["DriverRoomAvailability"] as? String
let InternalStairAvailability = value?["InternalStairAvailability"] as? String
let BasementAvailability = value?["BasementAvailability"] as? String
})
arrpost.append(p)
}
}
func updateHomeView(post : Post){
totalPriceLb.text = "\(String(post.TotalPrice)) SR"
areaLb.text = String(post.Area)
AddressLb.text = "\(post.City) \(post.District) \(post.Street)"
imageName.image = UIImage(named: "HomePic.jpg")
if post.PropertyType == "Home" {
bathLb.text = String(post.NbBathroom)
BedLb.text = String(post.NbBedroom)
imageName.image = UIImage(named: "HomePic.jpg")
}else if post.PropertyType == "Apartment" {
bathLb.text = String(post.NbBathroom)
BedLb.text = String(post.NbBedroom)
imageName.image = UIImage(named: "ApartPic.jpg")
}else if post.PropertyType == "Land"{
bathLb.isHidden = true
BedLb.isHidden = true
imageName.image = UIImage(named: "LandPic.jpg")
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
DataService.instance.retPost2()
// tableView.reloadData()
return DataService.instance.arrpost.count
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
}
func tableView
(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as! homecell
let post = DataService.instance.arrpost[indexPath.row]
// let post = DataServiceTemp.instance.getPosts()[indexPath.row]
cell.updateHomeView(post: post)
// tableView.reloadData()
return cell
}
I have a problem in my IOS App. I'm Using Firebase for saving & Retrieving data. All connections are good and the data is retrieved fine or sometimes incomplete.
And My Problem is when I run the app the views, labels, Pictures, etc are shown Empty at first when this components should show the data retrieved from firebase. I don't know what's the problem. Is it time or anything else? So the main problem is the components are shown empty before retrieving the data completely. I want to force the app to not show empty at first but showing the components with data.
I already use all method from google
https://firebase.google.com/docs/database/ios/read-and-write

Answer 1

Make hover UIView above the mainVC with a UIActivityIndicator until response comes from Firebase remove it