So I basically have a login screen on my app and after a successful login, before performing a segue to the main screen I save the following info in a Dictionary in session. It's something like this (putting static info for the example):
let preferences = UserDefaults.standard
let session_info : [String: String] = [
"user_id": "123",
"name": "John",
"email": "john#doe.com"
]
preferences.set(session_info, forKey: "session")
preferences.synchronize()
So the session data gets saved, if I assign it to a variable and print it, I get an optional dictionary of info in my console.
let session_data = preferences.value(forKey: "session")!
If I do a print(session_data) I get this output:
{
"user_id" = "123";
"name" = "John";
"email" = "john#doe.com";
}
My issue is that I am not sure how to access the keys, because if I treat the assigned variable as a Dictionary it says Type 'Any' has no subscript members. What I use is this:
print(session_data["user_id"])
Is there a way to access this info or do I have to save each variable to a separate session key?
Basically never use value(forKey with UserDefaults.
There is a dedicated API dictionary(forKey which returns [String:Any]? by default. In your case conditionally downcast the dictionary to [String:String].
if let sessionData = preferences.dictionary(forKey: "session") as? [String:String] {
print(sessionData["user_id"]!)
} else {
print("sessionData is not available")
}
And this is not JavaScript. Please name variables lowerCamelCased.
A more sophisticated way is to use a struct and save it with Codable
struct Session : Codable {
let userID, name, email : String
}
let preferences = UserDefaults.standard
let sessionInfo = Session(userID:"123", name: "John", email: "john#doe.com")
let sessionData = try! JSONEncoder().encode(sessionInfo)
preferences.set(sessionData, forKey: "session")
do {
if let sessionData = preferences.data(forKey: "session") {
let sessionInfo = try JSONDecoder().decode(Session.self, from: sessionData)
print(sessionInfo.userID)
}
} catch { print(error) }
You have to parse it as a Dictionary.
guard let session_data = preferences.value(forKey: "session")! as? NSDictionary else {return }
print(session_data["user_id"])
It should works.
Related
I have an array of strings which is the "uid's" of users. I am trying to append data/children to these multiple "uid's". Adding children or updating children to individual parents/users is easy and I understand how to do it. The problem is that this array can either contain 1 uid or 50 uid's. Is it possible for me to take these uid's and then update them with the same value? I am unsure what code to provide since I am just trying everything to attack this.
With the code below, this is me send a message to other users.
Array of uid strings
var data = [String]()
Sample code of me sending a message to 2 users, just wanted to provide something here to show I know how to update/save data
private func sendMessageWithProperties(_ properties: [String: Any]) {
let businessRef = Database.database().reference().child("Business Group Chats Messages").child((group?.uid)!).child((Auth.auth().currentUser?.uid)!)
let ref = Database.database().reference().child("Business Group Chats Messages").child((Auth.auth().currentUser?.uid)!).child((group?.businessName)!)
let businesChildRef = businessRef.childByAutoId()
let childRef = ref.childByAutoId()
let fromID = Auth.auth().currentUser!.uid
let timeStamp = Int(Date().timeIntervalSince1970)
var value:[String: Any] = ["fromId" : fromID, "timeStamp" : timeStamp, "name": self.loggedInUserData?["name"] as? String]
properties.forEach { (k,v) in
value[k] = v
}
childRef.updateChildValues(value) { (err, ref) in
if err != nil {
print(err!)
return
}
Database.database().reference().child("Business Group Chats").child((self.group?.uid)!).child((Auth.auth().currentUser?.uid)!).updateChildValues(["last message" : childRef.key!, "timestamp" : timeStamp, "businessName":(self.group?.businessName)!])
Database.database().reference().child("Business Group Chats").child((Auth.auth().currentUser?.uid)!).child((self.group?.uid)!).updateChildValues(["last message" : childRef.key!, "timestamp" : timeStamp])
self.inputContainerView.inputTextField.text = nil
}
}
Here is me taking that array of "uid's" and then pulling and printing that I can access each "uid" through a array of strings. Allowing me to access, now I can append data to each.
Database.database().reference().child("Businesses").observe(.value, with: { snapshot in
if snapshot.exists() {
self.businessUID = snapshot.value as? NSDictionary
if let dict = snapshot.value as? NSDictionary {
for item in dict {
let json = JSON(item.value)
let businessUid = json["uid"].stringValue
for uid in self.data {
if uid == businessUid {
//print(uid)
self.businessessuids = uid
print(self.businessessuids)
Database.database().reference().child("Businesses").child(self.businessessuids).observe(.value, with: { snapshot in
print(snapshot)
print("Trying to pull data from multiple strings right here this shoudld work")
})
print("printing the values to match with the string UID's")
}
}
}
}
} else {
print("does not exist")
}
})
I am creating a model for saving user data to a Firestore database and am initializing it with a dictionary. Depending on what fields I want to update, I put those values in the dictionary so that the user model only contains certain fields and will therefore only update those fields in my database. However, I want to somehow require that certain fields are provided in certain use cases.
* Below example is a very simplified version of what I am trying to do *
For example: if I am saving a new user, I want to make sure that I include a name, a profile image, and a description. But if I simply want to update a field, then I don't want to require that all those fields are included
I am 99% certain I am attacking this the wrong way, so any help is appreciated.
My Current User Model:
struct FirestoreUser {
var id: String
var name: String?
var profileImage: String?
var dictionary: [String: Any]
init(dictionary: [String: Any]) {
self.id = dictionary["id"] as! String
self.name = dictionary["name"] as? String
self.profileImage = dictionary["profileImage"] as? String
self.dictionary = dictionary
}
}
// MARK: Firestore functions
extension FirestoreUser {
typealias Handler = ((Error?) -> Void)?
func saveNewFirestoreUser(then handler: Handler = nil) {
// make sure all necessary variables are set
// if they aren't all set, something went wrong
guard let _ = name, let _ = profileImage else { return }
let firestore = Firestore.firestore()
let ref = firestore.collection("users").document(id)
ref.setData(dictionary) { (error) in
if let error = error {
handler?(error)
}
handler?(nil)
}
}
}
Construct struct with optional value and pass nil as the parameter which you don't want to update.
You can use the below extension to convert struct to dictionary later.
struct FirestoreUser: Codable {
var id: String
var name: String?
var profileImage: String?
}
extension Encodable {
var dictionary: [String: Any]? {
guard let data = try? JSONEncoder().encode(self) else { return nil }
return (try? JSONSerialization.jsonObject(with: data, options: .allowFragments)).flatMap { $0 as? [String: Any] }
}
}
Use -
let test = FirestoreUser(id: "01", name: "Abhinav", profileImage: nil)
print(test.dictionary)
Output -
["name": Abhinav, "id": 01]
In realtime database use updateChildValues instead of setValue if you just want to update the child. I believe there's something equivalent in firestore.
Answer for realtime database:
Update
self.ref.child("users/\(user.uid)/username").setValue(username)
Set new data
let key = ref.child("posts").childByAutoId().key
let post = ["uid": userID,
"author": username,
"title": title,
"body": body]
let childUpdates = ["/posts/\(key)": post,
"/user-posts/\(userID)/\(key)/": post]
ref.updateChildValues(childUpdates)
Answer for firestore:
Just read the documentation for firestore, use updateData instead of addDocument:
let washingtonRef = db.collection("cities").document("DC")
// Set the "capital" field of the city 'DC'
washingtonRef.updateData([
"capital": true
]) { err in
if let err = err {
print("Error updating document: \(err)")
} else {
print("Document successfully updated")
}
}
Set/Add new data
// Add a new document with a generated id.
var ref: DocumentReference? = nil
ref = db.collection("cities").addDocument(data: [
"name": "Tokyo",
"country": "Japan"
]) { err in
if let err = err {
print("Error adding document: \(err)")
} else {
print("Document added with ID: \(ref!.documentID)")
}
}
So rule of thumb is to only pass in the field that you need to update instead of the whole collection/dictionary.
I've spend hours looking at identical questions but none of the answers I've found are helping this issue. Simple app retrieves data from Firebase Database and passes to another view controller from the tableview. The main data will pass through but I can't edit the information without an identifying "key" which I tried to set as childByAutoID() but then changed to a timestamp. Regardless of the method, all I get is the entries info not the actual key itself.
func loadData() {
self.itemList.removeAll()
let ref = FIRDatabase.database().reference()
ref.child(userID!).child("MyStuff").observeSingleEvent(of: .value, with: { (snapshot) in
if let todoDict = snapshot.value as? [String:AnyObject] {
for (_,todoElement) in todoDict {
let todo = TheItems()
todo.itemName = todoElement["itemName"] as? String
todo.itemExpires = todoElement["itemExpires"] as? String
todo.itemType = todoElement["itemType"] as? String
self.itemList.append(todo)
print (snapshot.key);
}
}
self.tableView.reloadData()
}) { (error) in
print(error.localizedDescription)
}
}
If your data looks like this:
Uid: {
MyStuff: {
AutoID: {
itemName: “Apocalypse”,
itemExpires: “December 21, 2012”,
itemType: “Catastrophic”
}
}
}
Then I would query like this:
ref.child(userID!).child("MyStuff").observeSingleEvent(of: .value, with: { (snapshot) in
for child in snapshot.children {
let child = child as? DataSnapshot
let key = child?.key as? String
if let todoElement = child?.value as? [String: Any] {
let todo = TheItems()
todo.itemName = todoElement["itemName"] as? String
todo.itemExpires = todoElement["itemExpires"] as? String
todo.itemType = todoElement["itemType"] as? String
self.itemList.append(todo)
self.tableView.reloadData()
}
}
})
Additionally, like I said in my comment you can just upload the key with the data if you’re using .updateChildValues(). Example:
let key = ref.child("userID!").childByAutoId().key
let feed = ["key": key,
“itemName”: itemName] as [String: Any]
let post = ["\(key)" : feed]
ref.child("userID").child("MyStuff").updateChildValues(post) // might want a completionBlock
Then you can get the key the same way you are getting the rest of the values. So your new data would look like this:
Uid: {
MyStuff: {
AutoID: {
itemName: “Apocalypse”,
itemExpires: “December 21, 2012”,
itemType: “Catastrophic”,
key: “autoID”
}
}
}
The key you are trying to look for is located in the iterator of your for loop
Inside your if-let, try to do this:
for (key,todoElement) in todoDict {
print(key) // this is your childByAutoId key
}
This should solve the problem. Otherwise show us a screen of your database structure
I am saving data into userDeafults using 2 textfield as String, String but I want to know how to retrieve all the data to display either using loop or function
let save = UserDefaults.standard
let heading = headingText.text
let description = desxriptionTexr.text
save.set(description, forKey: heading!)
To get all keys and corresponding values in UserDefaults, you can use:
for (key, value) in UserDefaults.standard.dictionaryRepresentation() {
print("\(key) = \(value) \n")
}
In swift 3, you can store and retrieve using:
UserDefaults.standard.setValue(token, forKey: "user_auth_token")
print("\(UserDefaults.standard.value(forKey: "user_auth_token")!)")
I think is not a correct way to do.
I suggest you to put your values into a dictionary and set the dictionary into the UserDefaults.
let DictKey = "MyKeyForDictionary"
var userDefaults = UserDefaults.standard
// create your dictionary
let dict: [String : Any] = [
"value1": "Test",
"value2": 2
]
// set the dictionary
userDefaults.set(dict, forKey: DictKey)
// get the dictionary
let dictionary = userDefaults.object(forKey: DictKey) as? [String: Any]
// get value from
let value = dictionary?["value2"]
// iterate on all keys
guard let dictionary = dictionary else {
return
}
for (key, val) in dictionary.enumerated() {
}
If you have multiple Strings, simply save value as array
UserDefaults.standard.set(YourStringArray, forKey: "stringArr")
let arr = UserDefaults.standard.stringArray(forKey: "stringArr")
for s in arr! {
//do stuff
}
Here you are setting the key as heading and the value as description.
You can retrieve the value from userDefaults using UserDefaults.standard.object(forKey:), UserDefaults.standard.string(forKey: ),UserDefaults.standard.value(forKey: ) etc functions.
So its better to save heading and description for 2 different keys may be like
let save = UserDefaults.standard
let heading = headingText.text
let description = desxriptionTexr.text
save.set(description, forKey: "description")
save.set(heading, forKey: "heading")
And you could retrieve like
let description = UserDefaults.standard.string(forKey:"description")
let heading = UserDefaults.standard.string(forKey:"heading")
I was trying to initialize the values in the User object but from another question it seems like it's not possible to do it there - now, trying to do the same thing in a view controller in viewDidLoad, I'm running into another error:
This is my call to Firebase in viewDidLoad (myUser is a global variable var myUser:User!):
let userRef: FIRDatabaseReference = FIRDatabase.database().reference().child("users").childByAutoId()
let userRefHandle: FIRDatabaseHandle?
userRefHandle = userRef.observe(.value, with: { (snapshot) -> Void in
let userData = snapshot.value as! Dictionary<String, AnyObject>
let id = snapshot.key
if (FIRAuth.auth()?.currentUser?.uid) != nil {
if let name = userData["name"] as! String!, name.characters.count > 0 {
let handle = userData["handle"] as! String!
let gender = userData["gender"] as! String!
let profilePicture = userData["profilePicture"] as! String!
let uid = userData["uid"] as! String!
// let rooms = userData["rooms"] as! [[String : AnyObject]]
myUser.uid = uid
myUser.uid = handle
myUser.uid = name
myUser.uid = profilePicture
myUser.uid = gender
// myUser.rooms = rooms
} else {
print("Error! Could not initialize User data from Firebase")
}
}
})
The end goal for this is so that when a user launches the app (already signed up and their info is in Firebase), their info is pulled from the database and set to the User object so the values can be used around the app (name, handle, profilePicture, etc.).
I'm getting the error: Could not cast value of type 'NSNull' (0x106d378c8) to 'NSDictionary' on the let userData = snapshot.value line.
This is what the user's data looks like in Firebase:
"users" : {
"-KgjW9PEvCPVqzn7T5pZ" : {
"gender" : "male",
"handle" : "TestHandle123",
"name" : "Timothy",
"profilePicture" : "https://graph.facebook.com/*removed*/picture?type=large&return_ssl_resources=1",
"uid" : "2q4VCKu1e7hiL84ObdzgQcQ0pH63"
}
}
I'm wondering if this is the correct way to set a user's values from Firebase, and if so, how to avoid the error?
in your code, you are looking for the profile picture using profile
let profilePicture = userData["profile"] as! String!
but in the data, you have profilePicture
Because you have forced the unwrap you will get this error when the key is not found.
You should make sure that you use the same key in both places. It might also be worth including defaults in case you ever have data issues
let profilePicture = userData["profile"] as? String ?? "default"
Since the user is already signed up you should store the key that references to the firebase user (e.g. via NSUserDefaults). In this case "-KgjW9PEvCPVqzn7T5pZ". Use this in the userRef instead of childByAutoId, which would generate a new child location with a new key and doesn't exists yet (hence the NSNull).
let userRef: FIRDatabaseReference = FIRDatabase.database().reference().child("users").child("-KgjW9PEvCPVqzn7T5pZ")