RESOLVED! See the solution at the bottom of this post
I'm trying to create a JSON object to use for my backend using Alamofire. I am able to add a key with a String value but can't seem to be able to add a value of Array to AnyObject. I though it would be very straight forward but I haven't been able to find a solution.
func someFunction(btn: UIButton){
var someDictionary = Dictionary<String, AnyObject>()
let someArray = [textField[1].text,textField[2].text,textField[3].text]
someDictionary["answer"] = textField[0].text
someDictionary["options"] = someArray as? Array // <---- Can't be assigned to AnyObject
let url = "http://localhost:3000/api/question"
Alamofire.request(.POST, url, parameters: someDictionary).responseJSON { response in
if let JSON = response.result.value as? Dictionary<String, AnyObject>{
}
}
}
Solution: Removed as? Array and created loop to append initialized Array
func someFunction(btn: UIButton){
var someDictionary = Dictionary<String, AnyObject>()
var SomeArray = [String]()
for i in 1...3{ //created loop to append the textField text
SomeArray.append(textField[i].text!)
}
someDictionary["answer"] = textField[0].text
someDictionary["options"] = SomeArray // Removed "as? Array"
let url = "http://localhost:3000/api/question"
Alamofire.request(.POST, url, parameters: someDictionary).responseJSON { response in
if let JSON = response.result.value as? Dictionary<String, AnyObject>{
print("JSON Response From Server-->\(JSON)")
}
}
}
Clean your project and run again. Your code is working for me and I can assign
func someFunction(btn: UIButton){
var someDictionary = Dictionary<String, AnyObject>()
let someArray = ["SomeString","SomeString","SomeString"]
someDictionary["answer"] = textFields[0].text
someDictionary["options"] = someArray // now you can assign
let url = "http://localhost:3000/api/question"
Alamofire.request(.POST, url, parameters: someDictionary).responseJSON { response in
if let JSON = response.result.value as? Dictionary<String, AnyObject>{
}
}
}
Related
until version 10.7.6 of Realm I could convert to dictionary and then to json with this code below, but the ListBase class no longer exists.
extension Object {
func toDictionary() -> NSDictionary {
let properties = self.objectSchema.properties.map { $0.name }
let dictionary = self.dictionaryWithValues(forKeys: properties)
let mutabledic = NSMutableDictionary()
mutabledic.setValuesForKeys(dictionary)
for prop in self.objectSchema.properties as [Property] {
// find lists
if let nestedObject = self[prop.name] as? Object {
mutabledic.setValue(nestedObject.toDictionary(), forKey: prop.name)
} else if let nestedListObject = self[prop.name] as? ListBase { /*Cannot find type 'ListBase' in scope*/
var objects = [AnyObject]()
for index in 0..<nestedListObject._rlmArray.count {
let object = nestedListObject._rlmArray[index] as! Object
objects.append(object.toDictionary())
}
mutabledic.setObject(objects, forKey: prop.name as NSCopying)
}
}
return mutabledic
}
}
let parameterDictionary = myRealmData.toDictionary()
guard let postData = try? JSONSerialization.data(withJSONObject: parameterDictionary, options: []) else {
return
}
List now inherits from RLMSwiftCollectionBase apparently, so you can check for that instead. Also, this is Swift. Use [String: Any] instead of NSDictionary.
extension Object {
func toDictionary() -> [String: Any] {
let properties = self.objectSchema.properties.map { $0.name }
var mutabledic = self.dictionaryWithValues(forKeys: properties)
for prop in self.objectSchema.properties as [Property] {
// find lists
if let nestedObject = self[prop.name] as? Object {
mutabledic[prop.name] = nestedObject.toDictionary()
} else if let nestedListObject = self[prop.name] as? RLMSwiftCollectionBase {
var objects = [[String: Any]]()
for index in 0..<nestedListObject._rlmCollection.count {
let object = nestedListObject._rlmCollection[index] as! Object
objects.append(object.toDictionary())
}
mutabledic[prop.name] = objects
}
}
return mutabledic
}
}
Thanks to #Eduardo Dos Santos. Just do the following steps. You will be good to go.
Change ListBase to RLMSwiftCollectionBase
Change _rlmArray to _rlmCollection
Import Realm
I'm trying to fetch data from my firebase database, such that i can store it in a form of dictionary which is a type [String: [Any]] where key is the unique id and the value is a type of array which has the data stored under uniqueID->Question.
func getData(currUser: String, completion: #escaping (([String : [Any]]) -> ())) {
var newArray = [String : [Any]]()
let ref = Database.database().reference(fromURL: "MYURL").child("users/\(currUser)/Questions").observeSingleEvent(of: .value, with: { (snap) in
let enumerator = snap.children
while let rest = enumerator.nextObject() as? DataSnapshot, let value = rest.value{
newArray.updateValue([value], forKey: rest.key)
}
completion(newArray)
})
}
this completion block gives me:
["-LlpbizBpQTXOQ6zv0zd": [{
Qusetion = (
Hello,
test,
kkkkkkkkkkk
);
}]]]
Instead how can i get
["-LlpbizBpQTXOQ6zv0zd": [Hello,test,kkkkkkkkkkk]]
You're converting the value to a string, while it's actually a JSON object. That's why the value in your dictionary is a JSON object.
To only get the question text under Qusetion (typo?), you'll need to loop over that child snapshot and collect the individual values. Something like:
var newArray = [String : [Any]]()
let ref = Database.database().reference(fromURL: "MYURL").child("users/\(currUser)/Questions").observeSingleEvent(of: .value, with: { (snap) in
let enumerator = snap.children
while let rest = enumerator.nextObject() as? DataSnapshot {
var values = [String]
let valueEnumerator = rest.childSnapshot(atPath: "Qusetion").children
while let valueRest = valueEnumerator.nextObject() as? DataSnapshot, let value = rest.value {
values.append(value)
}
newArray.updateValue([values], forKey: rest.key)
}
completion(newArray)
})
I'm having some trouble with an array. I created an array called 'coins'
var coins = [Coin]()
then appended objects to it within a function
func getCoinData() {
AF.request("https://min-api.cryptocompare.com/data/top/mktcapfull?limit=10&tsym=USD", encoding: JSONEncoding.default).responseJSON { response in
if let json = response.result.value{
let responseDictionary = json as! [String : Any]
let data = responseDictionary["Data"] as! [Any]
for index in data {
let coin = index as! Dictionary<String, Any>
let coinInfo = coin["CoinInfo"] as! Dictionary<String, Any>
let displayInfo = coin["DISPLAY"] as! Dictionary<String, Any>
let usdDisplayInfo = displayInfo["USD"] as! Dictionary<String, Any>
let name = coinInfo["Name"]
let fullName = coinInfo["FullName"]
let imageUrl = coinInfo["ImageUrl"]
let price = usdDisplayInfo["PRICE"]
let marketCap = usdDisplayInfo["MKTCAP"]
let change24Hr = usdDisplayInfo["CHANGE24HOUR"]
let newCoin = Coin()
if let newCoinName = name, let newCoinFullName = fullName, let newCoinImageUrl = imageUrl, let newCoinPrice = price, let newCoinMarketCap = marketCap, let newCoinChange24hr = change24Hr {
let coinName = newCoinName
let coinFullName = newCoinFullName
let coinImageUrl = newCoinImageUrl
let coinPrice = newCoinPrice
let coinMarketCap = newCoinMarketCap
let coinChange24Hr = newCoinChange24hr
newCoin.name = "\(coinName)"
newCoin.fullName = "\(coinFullName)"
newCoin.imageURL = "\(coinImageUrl)"
newCoin.price = "\(coinPrice)"
newCoin.marketCap = "\(coinMarketCap)"
newCoin.change24Hr = "\(coinChange24Hr)"
self.coins.append(newCoin)
}
}
}
}
}
When i print 'self.coins.count' within the scope of the function i can see the count incrementing. Outside the function it's reading 0 items in the array.
Written for Swift 5
The problem is that you have a URL request which is Asynchronous. This means that the task is not waited for to complete.
In your problem, inside the function coins is printed after it has been assigned, after the URL request. However, when coins is printed outside the function, it is printed before it has been changed, as the URL request has not yet completed.
To solve this, you need to create a completion handler. A basic one is shown here:
// Our errors which could occur
enum SomeError: Error { case unknown }
// Function which is ASYNCHRONOUS
func someAsyncFunction(completion: #escaping (Result<Int, SomeError>) -> ()) {
// Temporary for this example
let success = true
let myNum = 3
// Return value if it is a success, otherwise return the error
if success {
completion(.success(myNum))
} else {
completion(.failure(.unknown))
}
}
// Call
someAsyncFunction { (result) in
print("Result: \(result)")
/* PRINT COINS HERE */
}
See a full guide on completion handlers using Result in Swift 5 at hackingwithswift.com.
I am fairly new to the Swift syntax and am receiving this error with my code "Cannot assign through subscript: subscript is get only"
This is from the line: friendDictionary[(friendUID as? String)!] = ["name": friendsData!["name"]]
Any advice on the correct way of doing it would be very helpful.
func getFriendsUIDs() {
if FBSDKAccessToken.currentAccessToken() == nil {
print("failed to start graph request")
return
}else{
}
if FBSDKAccessToken.currentAccessToken() != nil {
}
let parameters = ["fields": "name, id, picture"]
FBSDKGraphRequest(graphPath: "/me/friends", parameters: parameters).startWithCompletionHandler {
(NSURLConnection, result, requestError) in
let friendIds = result["id"] as? NSDictionary
let friendsData = friendIds!["data"] as? [NSDictionary]
var ref: FIRDatabaseReference!
ref = FIRDatabase.database().reference()
ref.child("users").child((FIRAuth.auth()?.currentUser?.uid)!).child("friendUIDs").observeEventType(.Value, withBlock: { (snapshot) in
self.FriendUIDs = NSArray()
self.FriendUIDs = (snapshot.value as? NSArray)!
print(self.FriendUIDs)
var friendDictionary = NSDictionary()
for friendUID in self.FriendUIDs {
friendDictionary[(friendUID as? String)!] = ["name": friendsData!["name"]]
}
self.fetchFriendFeed(friendDictionary)
}) { (error) in
print(error.localizedDescription)
}
}
}
func fetchFriendFeed(friendDictionary: NSDictionary) {
var ref: FIRDatabaseReference!
ref = FIRDatabase.database().reference()
for friendUID in FriendUIDs {
ref.child("users").child(friendUID as! String).child("Agenda").observeEventType(.ChildAdded, withBlock: { (snapshot) in
print(snapshot)
if let dictionary = snapshot.value as? [String: AnyObject] {
let friendPost = FriendPost()
friendPost.picture = friendDictionary[friendUID as! String]? ["picture"] as? String
friendPost.activity = dictionary["activity"] as? String
friendPost.date = dictionary["date"] as? String
friendPost.time = dictionary["time"] as? String
friendPost.friendname = friendDictionary[friendUID as! String]? ["name"] as? String
self.friendPosts.append(friendPost)
dispatch_async(dispatch_get_main_queue(), {
self.collectionView?.reloadData()
Nothing to do with Swift. You've elected to use Objective-C, in effect, by making friendDictionary an NSDictionary. NSDictionary is immutable; you can't assign into it or alter it in any way. That is simply a fact about Objective-C. The Swift var declaration makes no difference to this fact.
A better choice, since you are writing in Swift, would be to use a Swift dictionary, which is [AnyHashable:Any]() (in Swift 3). This will interchange with NSDictionary when you are talking to Objective-C, but it will give you a mutable dictionary because you (rightly) declared it with var.
Have you tried using NSMutableDictionary? That solved the issue for me.
For those who get stuck here, another reason for this happens when you try to assign something that does not conform the actual dictionary, in my example i was doing something like this:
var dict = [Date : UUID]()
let randomUUID = UUID()
dict[randomUUID] = Date.now
whereas I meant to write UUID : Date but I was sleepy so i made a mistake, and Swift gave me a misleading error saying subscript is get-only. So this error also appears with type mismatch for Swift 5.7.
I wrote the following functions, to access a userInfo dictionary:
func updateAddressLabel(notification: NSNotification) {
let userInfo:Dictionary<String,AnyObject> = notification.userInfo as! Dictionary<String, AnyObject>
self.infoLabelAddress.text = userInfo["geocodeLocation"]
}
func updateDispatchInformation(notification: NSNotification) {
let userInfo:Dictionary<String,AnyObject> = notification.userInfo as! Dictionary<String, AnyObject>
let streetName = userInfo["streetName"]
let incidentLatitude = userInfo["latitude"]
let incidentLongitude = userInfo["longitude"]
// Set Dispatch Info Label
self.infoLabelTitle.text = "Notruf"
self.infoLabelAddress.text = streetName
self.createIncidentAnnotation(incidentLatitude, longitude: incidentLongitude)
}
But I cannot access the keys, as I get the errors:
Cannot subscript a value of type 'Dictionary String,AnyObject> with an index of type 'String'
You are trying to assign AnyObject to label's text property. I would go:
func updateAddressLabel(notification: NSNotification) {
if let userInfo = notification.userInfo as? Dictionary<String,AnyObject>, let geocodeLocation = userInfo["geocodeLocation"] as? String {
infoLabelAddress.text = geocodeLocation
}
}
userInfo is Dictionary<String,AnyObject>, to assign the value to a specific type like String you have to downcast the object for example
self.infoLabelAddress.text = userInfo["geocodeLocation"] as! String