Grab data saved in Firebase and present it on view controller [closed] - swift

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Edit (I hope this is more specific):
I can't seem to get the data from firebase to show up the page when i run the app:
When a notification is saved under a child node on firebase, an 'objectId' is printed - I want to grab the data under the node that matches this objectId under another node called 'pinion', a snippet of the JSON firebase structure is:
"notification" : {
"Gmg1ojNoBiedFPRNSL4sBZz2gSx2" : {
"-L_xNVcs7f3RhuLAcg7j" : {
"from" : "Gmg1ojNoBiedFPRNSL4sBZz2gSx2",
"objectId" : "-L_xNVcfZavjGFVv6iGs",
"timestamp" : 1552586771,
"type" : "pinion"
},
"pinions" : {
"Gmg1ojNoBiedFPRNSL4sBZz2gSx2" : {
"-L_xNVcfZavjGFVv6iGs" : {
"option A" : "Aaaa",
"option B" : "Cccc",
"question" : "Four",
"selectedId" : "FoFQDAGGX9hntBiBdXYCBHd8yas2",
"uid" : "Gmg1ojNoBiedFPRNSL4sBZz2gSx2"
},
"users" : {
"Gmg1ojNoBiedFPRNSL4sBZz2gSx2" : {
"email" : "eeee#gmail.com",
"fullname" : "Eeee",
"profileImageUrl" : "https://firebasestorage.googleapis.com/v0/b/pinion-4896b.appspot.com/o/profile_image%2FGmg1ojNoBiedFPRNSL4sBZz2gSx2?alt=media&token=209e57ca-b914-4023-8f85-fadfae7b7407",
},
Would appreciate any help and let me know if you need any other information - thank you in advance :)
UPDATE:
It's working for the question and answers but I am getting an error "Unable to infer closure type in the current context" when calling the image:
#IBOutlet weak var senderProfileImage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
showImageOfSender()
}
var ref = Database.database().reference()
var userId = "" //this was made equal to the autoId under pinion, under the users ID in another view controller
func showImageOfSender() {
var senderPhoto = [String]()
guard let uid = Auth.auth().currentUser?.uid else {
return
}
let senderId = ref.child("pinions").child(uid).child(userId).child("uid")
ref.child("users").child(senderId).observeSingleEvent(of: .value, with: { snapshot in
//error is in the above line
let senderImage = snapshot.childSnapshot(forPath: "profileImageUrl").value as! String
senderPhoto.append(senderImage)
let senderImageUrl = URL.init(string: senderImage)
self.senderProfileImage.sd_setImage(with: senderImageUrl)
})
}

Answer 1

I think this is what you mean, first import Firebase:
import Firebase
then get the database reference:
class PinionNotificationsViewController: UIViewController {
var ref: DatabaseReference!
...
}
then your function can look like this if you know the UID:
func showQuestionAndAnswers() {
let uid = userId
ref = ref.child("pinions").child(uid)
ref.observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let optionA = value?["option A"] as! String
let optionB = value?["option B"] as! String
print(optionA) // <- prints: "Bbbb"
print(optionB) // <- prints: "Dddd"
})
}
If you don't know the uid you can use
ref = ref.child("pinions")
ref.observe(.childAdded) { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let optionA = value?["option A"] as! String
// then you can append these values into an array it will go through all of them eg:
self.answersArray.append(optionA) // answers array will contain all optionA values from all children in the database under `"pinions"`
}
This way in my experience would match the database order so in your array all options would be in the order of their children as they are in the database.
Hope this helps!