I need to initialize an object, and pass it through a prepareforsegue to another class.
Last line of the code below throws "Contextual type 'FPChat!.Type' cannot be used with dictionary literal"
if (segue.identifier == "chatmessages") {
let vc = segue.destination as! FPChatMessageViewController
//vc.currentChat = fPChat
}
}
fPchat = FPChat?
// Start the Chat
#IBAction func Chat(_ sender: UIButton) {
// Create a new entry in chats. This variable is passed with prepareforsegue
let chatRef = ref.child("chats").childByAutoId()
let chatId = chatRef.key
//fPchat = FPChat?
let fPchat = FPChat.currentChat(currentChatID: chatId)
Below chat class:
import Firebase
class FPChat {
var chatID = ""
var chatDate: Date!
var text = ""
var messages: [FPChatMessage]!
var author: FPUser!
var mine = true
// Calling FPChat.currentChat(id) I have back the FPChat object
static func currentChat(currentChatID: String) -> FPChat {
return FPChat(chatID: currentChatID)
}
private init(chatID: String) {
self.chatID = chatID
}
init(snapshot: DataSnapshot, andMessages messages: [FPChatMessage]) {
guard let value = snapshot.value as? [String: Any] else { return }
self.chatID = snapshot.key
if let text = value["text"] as? String {
self.text = text
}
guard let timestamp = value["timestamp"] as? Double else { return }
self.chatDate = Date(timeIntervalSince1970: (timestamp / 1_000.0))
guard let author = value["author"] as? [String: String] else { return }
self.author = FPUser(dictionary: author)
self.messages = messages
self.mine = self.author.userID == Auth.auth().currentUser?.uid
}
}
What I am doing wrong?
Related
I am trying to get data from firestore collection and assign it to an array of dictionaries. for this part of the code below... i get the error "Cast from 'QuerySnapshot?' to unrelated type '[[String : Any]]' always fails" and the console prints "is not working".
guard let snap = snapshot as? [[String:Any]] else {
print("is not working")
completion(.failure(DatabaseError.failedToFetch))
return
}
Here is the full code.
// fetches and returns all conversations for the user with passed in uid
public func getAllConversations(for uid: String, completion: #escaping(Result<[Conversation], Error>) -> Void) {
print("fetching all convos")
//NEW
let db = Firestore.firestore()
let CurrentUser = Auth.auth().currentUser?.uid
let ListRef = db.collection("users").document(CurrentUser!).collection("conversations")
// fetch the current users convo list
ListRef.getDocuments { snapshot, error in
if let err = error {
debugPrint("Error fetching documents: \(err)")
} else {
guard let snap = snapshot as? [[String:Any]] else {
print("is not working")
completion(.failure(DatabaseError.failedToFetch))
return
}
print("is working")
let conversations: [Conversation] = snap.compactMap({ dictionary in
guard let id = dictionary["id"] as? String,
let name = dictionary["name"] as? String,
let otherUserUID = dictionary["other_user-uid"] as? String,
let latestMessage = dictionary["latest-message"] as? [String:Any],
let date = latestMessage["date"] as? String,
let message = latestMessage["message"] as? String,
let isRead = latestMessage["is-read"] as? Bool else {
return nil
}
//save other user ID to a global var
self.test = otherUserUID
//assign data into an array of dictionaries
let latestConvoObject = LatestMessage(date: date, text: message, isRead: isRead)
return Conversation(id: id, name: name, otherUserUid: otherUserUID, latestMessage: latestConvoObject)
})
completion(.success(conversations))
}
}
}
There are a numbers of way to read that data, and the process can be simplified by conforming objects to the codable protocol but let me provide a straight forward example. I don't know what your Conversation object looks like so here's mine
class ConversationClass {
var from = ""
var to = ""
var msg = ""
var timestamp = 0
convenience init(withDoc: DocumentSnapshot) {
self.init()
self.from = withDoc.get("from") as? String ?? "no from"
self.to = withDoc.get("to") as? String ?? "no to"
self.msg = withDoc.get("msg") as? String ?? "no msg"
self.timestamp = withDoc.get("timestamp") as? Int ?? 0
}
}
and then here's the the code that reads in all the conversation documents from a Collection, stores each in a ConversationClass object, puts those in an array and returns it through an escaping completion handler
func getConversations(completion: #escaping( [ConversationClass] ) -> Void) {
let conversationCollection = self.db.collection("conversations")
conversationCollection.getDocuments(completion: { snapshot, error in
if let err = error {
print(err.localizedDescription)
return
}
guard let docs = snapshot?.documents else { return }
var convoArray = [ConversationClass]()
for doc in docs {
let convo = ConversationClass(withDoc: doc)
convoArray.append(convo)
}
completion(convoArray)
})
}
struct UserClass {
var babyName: String!
var babyHeight: String!
var babyWeight: String!
var babyURL: String!
var uid: String!
var reference:DatabaseReference!
var key: String!
init?(snapshot: DataSnapshot?) {
guard let value = snapshot?.value as? [String:AnyObject],
let uid = value["uid"] as? String,
let babyName = value["BabyName"] as? String,
let babyURL = value["BabyURL"] as? String,
let babyHeight = value["BabyHeight"] as? String,
let babyWeight = value["BabyWeight"] as? String else {
return nil
}
self.key = snapshot?.key
self.reference = snapshot?.ref
self.uid = uid
self.babyURL = babyURL
self.babyName = babyName
self.babyHeight = babyHeight
self.babyWeight = babyWeight
}
func getuserData() -> String {
return ("BabyName = \(babyName)")
}
}
func fetchCurrentUserInfo() {
var currentUserRef = Database.database().reference().child("Users").child("\(userID)")
handler = currentUserRef.queryOrderedByKey().observe(DataEventType.value, with: { (snapshot) in
print("User data = \(snapshot.value)")
let user = UserClass(snapshot: snapshot)
print(user?.babyName)
self.babyName.text = user?.babyName
})
}
I am getting user data but not user.babyName. How can I fix this?
May be this will help you, as the db structure is not mentioned in question. but you have to iterate children one by one and then use for loop to fetch the exact data from firebase.
reference = FIRDatabase.database().reference()
reference.child("Users").queryOrderedByKey().observe(DataEventType.value, with: { (snapshot) in
if let snapshots = snapshot.children.allObjects as? [FIRDataSnapshot] {
for snap in snapshots
{
let userId = child.childSnapshot(forPath: "userID").value! as! String
print(userId)
}
}
})
How can I clear the shared dictionary on logout in which I am saving login response?
Here is the code I am doing on getting status 1.
if(status == 1)
{
DispatchQueue.main.async {
GAReusableClass.sharedInstance.hideActivityIndicator()
UserDefaults.standard.set(self.DataDict, forKey:MaindataKey)
let Dict = self.mainDict[KData] as! [String: AnyObject]
print("self.DataDict", self.DataDict)
let User_ID = Dict[KUuid]as! String
print(User_ID)
let HMACSECRETKEY = self.deviceToken + "+" + User_ID
kHMACKey = HMACSECRETKEY
let cipher:String = CryptoHelper.encrypt(input:HMACSECRETKEY)!;
print(HMACSECRETKEY)
UserDefaults.standard.setValue(cipher, forKey:HmacKey)
UserDefaults.standard.set(true, forKey: "isLogin")
GAloginUserInfo.shared.saveUserInfo(dict: Dict )
let tabar = self.storyboard?.instantiateViewController(withIdentifier: "GAtHomeTabbarViewController") as! GAtHomeTabbarViewController
self.navigationController?.pushViewController(tabar, animated: true)
}
Here is the shared dictionary which I am using to save the values of login response.
import UIKit
import Firebase
class GAloginUserInfo: NSObject {
var loginUserMobileNo : String?
var loginUserId : String?
var loginUserUuid : String?
var loginUserCountry : String?
var loginUserCountryCode : String?
var loginUserEmail : String?
var loginUserlatitude : String?
var loginUserLongitude : String?
var loginUserName : String?
var loginUserQrcode : String?
var loginUserProfilePic : String?
var isverify : String?
var loginPassword : String?
var dateOfBirth: String?
var earnedPoints:String?
var loginUserGender:String?
var loginUserFollowers:Int = 0
static let shared = GAloginUserInfo()
func saveUserInfo (dict : [String : AnyObject?] ) {
if let loginUserMobileNo = dict["mobile"] as? String {
self.loginUserMobileNo = loginUserMobileNo
}
if let loginUserId = dict["id"] as? String {
self.loginUserId = loginUserId
}
if let loginUserUuid = dict["uuid"] as? String {
self.loginUserUuid = loginUserUuid
print(loginUserUuid)
}
if let loginUserCountry = dict["country"] as? String {
self.loginUserCountry = loginUserCountry
}
if let loginUserCountryCode = dict["country_code"] as? String {
self.loginUserCountryCode = loginUserCountryCode
}
if let loginUserEmail = dict["email"] as? String {
self.loginUserEmail = loginUserEmail
}
if let loginUserProfilePic = dict["profile_pic"] as? String {
self.loginUserProfilePic = loginUserProfilePic
}
if let loginUserLongitude = dict["logitude"] as? String {
self.loginUserLongitude = loginUserLongitude
}
if let loginUserName = dict["name"] as? String {
self.loginUserName = loginUserName
}
if let loginUserQrcode = dict["qr_code"] as? String {
self.loginUserQrcode = loginUserQrcode
}
if let Password = dict["password"] as? String{
self.loginPassword = Password
}
if let dateOfBirth = dict["dob"] as? String{
self.dateOfBirth = dateOfBirth
}
if let earnedPoints = dict["points"] as? String{
let myDouble = Double(earnedPoints)
let doubleStr = String(format: "%.2f", myDouble!)
self.earnedPoints = doubleStr
}
if let loginUserGender = dict["gender"] as? String{
self.loginUserGender = loginUserGender
}
if let loginUserFollowers = dict["followersCount"] as? Int{
self.loginUserFollowers = loginUserFollowers
}
}
}
Actually, the problem is when I log out and log in again with some other user it still shows some values of the previous user. I am clearing the userdefaults on the logout function. but I don't know how to clear this type of shared dictionary.
Use removeObject(forKey:)
to remove the values stored from user defaults in Logout method
UserDefaults.standard.removeObject(forKey: MaindataKey)
UserDefaults.standard.removeObject(forKey: HmacKey)
UserDefaults.standard.set(false, forKey: "isLogin")
Create a method to remove the values from the singleton class like this
extension GAloginUserInfo {
func removeUserInfo() {
self.loginUserMobileNo = nil
self.loginUserId = nil
self.loginUserUuid = nil
self.loginUserCountry = nil
self.loginUserCountryCode = nil
self.loginUserEmail = nil
self.loginUserlatitude = nil
self.loginUserLongitude = nil
self.loginUserName = nil
self.loginUserQrcode = nil
self.loginUserProfilePic = nil
self.isverify = nil
self.loginPassword = nil
self.dateOfBirth = nil
self.earnedPoints = nil
self.loginUserGender = nil
self.loginUserFollowers = 0
}
}
and call this method in logout
GAloginUserInfo.shared.removeUserInfo()
people in my app sometimes needs to update the status of something. Now can you choose of 2 things: The so called "Rollerbank" is still there or the "Rollerbank" is removed. The users can create a data ref. The id that will be created by childbyAutoID. Now is my question how to get the right child and update some childs with a value. My post:
class Post {
let ref: DatabaseReference!
var TypeControle: String = ""
var Stad: String = ""
var Tijd: String = ""
var TijdControle: String = ""
var TijdControleniet: String = ""
var Latitude: String = ""
var Longitude: String = ""
var Extrainformatie: String = ""
var Staater: String = ""
var Staaternietmeer: String = ""
init(TypeControle: String) {
self.TypeControle = TypeControle
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(Stad: String){
self.Stad = Stad
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(Tijd: String) {
self.Tijd = Tijd
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(Latitude: String) {
self.Latitude = Latitude
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(Longitude: String) {
self.Longitude = Longitude
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(Extrainformatie: String) {
self.Extrainformatie = Extrainformatie
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(Staater: String) {
self.Staater = Staater
ref = Database.database().reference().child("Rollerbanken").child("Controletest").childByAutoId()
}
init(Staaternietmeer: String) {
self.Staaternietmeer = Staaternietmeer
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(TijdControle: String) {
self.TijdControle = TijdControle
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(TijdControleniet: String) {
self.TijdControleniet = TijdControleniet
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init() {
ref = Database.database().reference().child("Rollerbanken").childByAutoId()
}
init(snapshot: DataSnapshot)
{
ref = snapshot.ref
if let value = snapshot.value as? [String : Any] {
TypeControle = value["TypeControle"] as! String
Stad = value["Stad"] as! String
Tijd = value["Tijd"] as! String
Latitude = value["Latitude"] as! String
Longitude = value["Longitude"] as! String
Extrainformatie = value["Extrainformatie"] as! String
Staater = value["Staater"] as! String
Staaternietmeer = value["Staaternietmeer"] as! String
TijdControle = value["TijdControle"] as! String
TijdControleniet = value["TijdControleniet"] as! String
}
}
func save() {
ref.setValue(toDictionary())
}
func toDictionary() -> [String : Any]
{
return [
"TypeControle" : TypeControle,
"Stad" : Stad,
"Tijd" : Tijd,
"Latitude" : Latitude,
"Longitude" : Longitude,
"Extrainformatie" : Extrainformatie,
"Staater" : Staater,
"Staaternietmeer" : Staaternietmeer,
"TijdControle" : TijdControle,
"TijdControleniet" : TijdControleniet
]
}
}
Data for the TableViewCell:
class ControleTableViewCell: UITableViewCell {
#IBOutlet weak var storyControle: UILabel!
#IBOutlet weak var storyTijd: UILabel!
var post: Post! {
didSet {
storyControle.text = "\(post.Staaternietmeer)"
storyTijd.text = "\(post.TijdControleniet)"
storyControle.text = "\(post.Staater)"
storyTijd.text = "\(post.TijdControle)"
}
}
How my update button looks like:
#IBAction func Update(_ sender: Any) {
let alertController1 = UIAlertController(title: "Update melden" , message: "De rollerbank", preferredStyle: .alert)
// Create the actions
let RollerbankAction1 = UIAlertAction(title: "Staat er nog steeds", style: UIAlertActionStyle.default) {
UIAlertAction in
NSLog("Ja Pressed")
self.newStory.Staater = self.Staater
self.newStory.TijdControle = self.TijdControle
self.newStory.save()
}
let cancelAction1 = UIAlertAction(title: "Staat er niet meer", style: UIAlertActionStyle.cancel) {
UIAlertAction in
NSLog("Cancel Pressed")
let date = Date()
let calendar = Calendar.current
let hour = calendar.component(.hour, from: date)
let minutes = calendar.component(.minute, from: date)
let Tijd = "\(hour) : \(minutes)"
self.newStory.Staaternietmeer = self.Staaternietmeer
self.newStory.TijdControleniet = Tijd
self.newStory.save()
}
alertController1.addAction(RollerbankAction1)
alertController1.addAction(cancelAction1)
self.present(alertController1, animated: true, completion: nil)
}
This is the Structure that i use. If i run all this code, the new data will go in a other childbyAutoID and thats not what i want. It just needs to update/setvalue in the cleare space named "Staaternietmeer" and "TijdControleniet". Can anybody help me with that?
You would then need to store the Push ID somewhere so that you can reuse it later.
To generate a unique Push ID you would use :
Database.database().reference().childByAutoId()
And to store it somewhere :
let postKey = Database.database().reference().childByAutoId().key
And then, say you need a method to share a post for example, and want to add this post to multiple nodes, that's how it may look like :
func sharePost(_ postContent: String, completion: #escaping (Bool) -> ()) {
guard let currentUserId = Auth.auth().currentUser?.uid else {
completion(false)
return
}
let postKey = Database.database().reference().childByAutoId().key
let postData: [String: Any] = [ "content": "blabla",
"author": currentUserId ]
let childUpdates: [String: Any] = ["users/\(currentUserId)/posts/\(postKey)": true,
"posts/\(postKey)": postData ]
Database.database().reference().updateChildValues(childUpdates, withCompletionBlock: { (error, ref) in
guard error == nil else {
completion(false)
return
}
completion(true)
})
}
Now to access the unique Push ID later on, you would use :
Database.database().reference().observe(.childAdded, with: { (snapshot) in
// Here you get the Push ID back :
let postKey = snapshot.key
// And others things that you need :
guard let author = snapshot.childSnapshot(forPath: "author").value as? String else { return }
guard let content = snapshot.childSnapshot(forPath: "content").value as? String else { return }
// Here you store your object (Post for example) in an array, and as you can see you initialize your object using the data you got from the snapshot, including the Push ID (`postKey`) :
posts.append(Post(id: postKey, content: content, author: author))
})
I'm using socket.io Swift Library. With the following line of code,
socket.on("info") { (dataArray, socketAck) -> Void in
let user = dataArray[0] as? User
print(user._id)
}
dataArray[0] is a valid object but user appears to be nil after casting.
Since dataArray[0] returns as an AnyObject,
how can i cast AnyObject to User Object?. Or somehow manage to do what i want with a different approach?
Since after this line
let user = dataArray[0] as? User
you have a nil value inside user it means that you don't have a User value at the first position of dataArray.
Since dataArray comes from a server (as I guess) it probably contains a serialized version of User.
Now we really need to know what really dataArray[0] is. However...
if dataArray[0] contains NSData
In this case try this
let json = JSON(dataArray[0] as! NSData)
let user = User(json:json)
You need to create a constructor that accept AnyObject and read data in it.
I guess in this case dataArray[0] is an JSON Object.
class User {
init(data: [String: AnyObject]) {
username = data["username"] as? String ?? ""
}
}
This is how i manage mine:
// Structure used as parameter
struct InfoStruct {
var nome: String = ""
var sobrenome:String = ""
var nascimentoTimestamp: NSNumber = 0
init() {
}
// Struct to AnyObject
func toAnyObject() -> Any {
var dic = [String:AnyObject?]()
if (nome != "") { dic["nome"] = nome as AnyObject }
if (sobrenome != "") { dic["sobrenome"] = sobrenome as AnyObject }
if (nascimentoTimestamp != 0) { dic["nascimentoTimestamp"] = nascimentoTimestamp as AnyObject }
return dic
}
// AnyObject to Struct
func fromAnyObject(dic:[String:AnyObject]) -> InfoStruct {
var retorno = InfoStruct()
if (dic["nome"] != nil) { retorno.nome = dic["nome"] as? String ?? "" }
if (dic["sobrenome"] != nil) { retorno.sobrenome = dic["sobrenome"] as? String ?? "" }
if (dic["nascimentoTimestamp"] != nil) { retorno.nascimentoTimestamp = dic["nascimentoTimestamp"] as? NSNumber ?? 0 }
return retorno
} }
// User class
class Usuario: NSObject {
var key: String
var admin: Bool
var info: InfoStruct // Struct parameter
init(_ key: String?) {
self.key = key ?? ""
admin = false
info = InfoStruct() // Initializing struct
}
// From Class to AnyObject
func toAnyObject() -> Any {
var dic = [String:AnyObject?]()
if (key != "") { dic["key"] = key as AnyObject }
if (admin != false) { dic["admin"] = admin as AnyObject }
dic["info"] = info.toAnyObject() as AnyObject // Struct
return dic
}
// From AnyObject to Class
func fromAnyObject(dic:[String:AnyObject]) -> Usuario {
let retorno = Usuario(dic["key"] as? String)
if (dic["key"] != nil) { retorno.key = dic["key"] as? String ?? "" }
if (dic["admin"] != nil) { retorno.admin = dic["admin"] as? Bool ?? false }
if (dic["info"] != nil) { retorno.info = InfoStruct.init().fromAnyObject(dic: dic["info"] as! [String : AnyObject]) } // Struct
return retorno
} }
// Using
let dao = FirebaseDAO.init(_type: FirebaseDAOType.firebaseDAOTypeUser)
dao.loadValue(key: uid) { (error, values:[String : AnyObject]) in
if error == nil {
let user = Usuario(values["key"] as? String).fromAnyObject(dic: values)
}
}
I hope it helps!