I am trying to convert a swift dictionary (that has String as keys and struct as values) into json data using NSJSONSerialization. But I am getting this error:
Cannot invoke 'dataWithJSONObject' with an argument list of type'([String : Vik.Version], options: NSJSONWritingOptions, error: nil)
Is there anything that I am missing. any help would be appreciated.
Thanks
Following is my code.
final class Vik: NSObject {
private struct Version {
private var name: String
private var filesToAdd = [String]()
private var filesToRemove = [String]()
init(name: String, filesToAdd: [String]?, filesToRemove: [String]?) {
self.name = name
if let filesToAdd = filesToAdd {
self.filesToAdd = filesToAdd
}
if let filesToRemove = filesToRemove {
self.filesToRemove = filesToRemove
}
}
}
......
......
......
private var changeLogDict = [String : Version]()
private func addToDirectory() {
.......
.......
let jsonData = NSJSONSerialization.dataWithJSONObject(self.changeLogDict, options: NSJSONWritingOptions.PrettyPrinted, error: nil)
.......
.......
}
}
I figured it out. NSJSONSerialization.dataWithJSON method takes 'AnyObject' data type. Swift dictionary is a struct not an object and hence its complaining. Following line compiles fine
let jsonData = NSJSONSerialization.dataWithJSONObject(self.changeLogDict as NSDictionary, options: NSJSONWritingOptions.PrettyPrinted, error: nil)
Related
I have a generic dictionary, and built a generic function to access that dictionary (to prevent concurrency access problems).
My (singleton) data class looks like:
class AppData {
static let genericDict: Dictionary<String, Any> = [:]
static func genericGet<T: Any>(_ objID: String) -> T {
let retVal: T
mySemaphore.wait()
retVal = genericDict[objID] as! T
mySemaphore.signal()
return retVal
}
}
However, when I call my function like so:
class SomeClass {
let product: SomeObj = AppData.genericGet(objID) as! SomeObj
}
I get the error:
Generic parameter 'T' could not be inferred
I both explicitly and implicitly cast the type to my desired value. Not sure what else I can do to fix this issue.
I've tried restarting XCode, does not help.
The real code:
public class AppData: ObservableObject {
static private var dataDirectory: Dictionary<String, Any> = Dictionary(minimumCapacity: 10000)
static let dataGetLock = DispatchSemaphore(value: 1)
static func get<T: Any>(_ objID: String) -> T? {
let retVal: T
dataGetLock.wait()
retVal = dataDirectory[objID] as! T
dataGetLock.signal()
return retVal
}
}
I get the error on the following two lines:
class StoreViewEnvironment: ObservableObject {
func initProductLoad(storeID: String) {
...
let liveStore: Store = AppData.get(storeID) as! Store
let liveMenu: Menu = AppData.get(liveStore.menuID) as! Menu
...
}
}
I don't approve of the way you're doing this (on the general grounds that Any is just about always a bad smell), but here's a version that compiles (just delete the Any constraint):
class AppData {
static let genericDict: Dictionary<String, Any> = [:]
static func get<T>(_ objID: String) -> T {
let retVal: T
retVal = genericDict[objID] as! T
return retVal
}
}
class SomeClass {
let product : String = AppData.get("yoho")
}
I am trying to store the dictionary in my class Marker but it is throwing an error saying it is not encodable or decodable. I can see the error is caused by the [String: Any] but how can I go around it?
var buttonActions : [String: [String: [String:Any]]] = [:]
Save and Load
func saveData() {
let dataFilePath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("\(fileName).plist")
let encoder = PropertyListEncoder()
do {
let data = try encoder.encode(markerArray)
try data.write(to: dataFilePath!)
print("Saved")
} catch {
print("Error Encoding \(error)")
}
}
func loadData() {
let dataFilePath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("\(fileName).plist")
if let data = try? Data(contentsOf: dataFilePath!){
let decoder = PropertyListDecoder()
do {
markerArray = try decoder.decode([Marker].self, from: data)
} catch {
print("Decode Error \(error)")
}
}
Class
class Marker : Encodable, Decodable {
var UUIDpic: UUID = UUID()
var alpha: Int = 1
var buttonType: Int = 0
var buttonActions : [String: [String: [String:Any]]] = [:]
var buttonNameColor: String = ""
var buttonNameFontSize: Int = 10
var buttonShape: String = ""
var loggerRect: String = ""
var maskColor: String = ""
var name: String = ""
}
Unfortunately you cannot use encode or decode on generic types containing Any (e.g. [String: Any] or [Any]). Any does not conform to protocols Encodable nor Decodable and Swift doesn't know how to encode/decode it. You must use a concrete generic type for your dictionary (e.g. [String: String]).
If you still need to use a general type like Any you have to implement encode(to:) and init(from:) methods. Another option would be to use a struct instead of your [String: [String: [String:Any]]] which conforms to Codable (Encodable & Decodable). You will still have to implement encode(to:) and init(from:) methods in that struct, but the bright side is that you will not have to write the encoder.encode() story for all the properties like you would have to if you implement them in the Marker class.
So finally worked it out with the help of Andrada.
I added a second struct which held the action and by passed having to use [string:any]
class Marker : Encodable, Decodable {
var UUIDpic: UUID = UUID()
var alpha: Int = 1
var buttonType: Int = 0
var buttonAction : [String: [ButtonAction]] = [:] //Dictionary I edited using the new struct
var buttonNameColor: String = ""
var buttonNameFontSize: Int = 10
var buttonShape: String = ""
var loggerRect: String = ""
var maskColor: String = ""
var name: String = ""
}
Below is the struct I added
struct ButtonAction: Codable {
var action: String
var array_linked_of_buttons: [[String:String]]
init(action: String, array_linked_of_buttons: [[String:String]]) {
self.action = action
self.array_linked_of_buttons = array_linked_of_buttons
}
}
Make sure to init your struct or it won't work.
This is my NSObject class file that I am using to populate my collectionView cell. I am fetching my data from firebase and populating the collectionViewCell with it. Xcode is giving this error "Missing argument for parameter 'dictionary' in call" I have tried all I can but I could not figure out what is missing. What is causing this error and how can I fix it?
class BusinessCategory: NSObject {
var ref: FIRDatabaseReference!
var name: String?
var logo: String?
var featurebusiness: [SampleBusinesses]?
var type: String?
init(dictionary: [String: Any]) {
self.name = dictionary["BusinessName"] as? String ?? ""
self.logo = dictionary["logo"] as? String ?? ""
}
static func sampleBusinessCategories() -> [BusinessCategory] {
var FinancialInstitutionCatergory = BusinessCategory()
FinancialInstitutionCatergory.name = "Financial Institutions"
var featurebusiness = [SampleBusinesses]()
//logic
FIRDatabase.database().reference().child("BusinessCategories/Banks").observeSingleEvent(of: .childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let financeApp = SampleBusinesses()
financeApp.setValuesForKeys(dictionary)
financeApp.name = dictionary["BusinessName"] as? String
featurebusiness.append(financeApp)
}
FinancialInstitutionCatergory.featurebusiness = featurebusiness
print(snapshot)
}, withCancel: nil)
return [FinancialInstitutionCatergory]
}
}
The error is stating you need to include the dictionary parameter in whatever line has the error; an example might look something like this:
var FinancialInstitutionCatergory = BusinessCategory(dictionary: [String : Any])
It's unclear which line in your code has the error; you'll need to include the parameter somewhere.
Here is my below code:
private static var __once: () = {
Singleton.instance = RtccManager()
if let instance = Singleton.instance {
instance.connectionParameters = instance.flattenConnectionParametersOverride(nil)
instance.currentStat = .sta_notConnected
DispatchQueue.global(priority: DispatchQueue.GlobalQueuePriority.background).async {
instance.rtccConnect([:])
}
}
}()
var connectionParameters: [String : Any] = [:]
var currentStat: AppStatus = AppStatus.sta_notConnected
class var sharedInstance: RtccManager {
struct Singleton {
static var instance: RtccManager? = nil
static var token: Int = 0
}
_ = RtccManager.__once
return Singleton.instance!
}
I am getting error on line Singleton.instance = RtccManager() and line
if let instance = Singleton.instance
Error is: Use of unresolved identifier 'Singleton'
This error came after migrating to Swift 3.0
Any ideas on how can I resolve this error's?
If you're migrating your code It's should be a good idea to adapt your singleton creation mode to the new way suggested by Apple in their docs.
Here's an example
public class RtccManager
{
/*
Nested types
*/
public enum AppStatus
{
case sta_connected
case sta_notConnected
}
public static let sharedInstance: RtccManager = RtccManager()
public private(set) var connectionParameters: [String: Any]
public private(set) var currentStat: AppStatus
private init()
{
self.connectionParameters = [String: Any]()
// flattenConnectionParametersOverride
self.currentStat = .sta_notConnected
}
}
Hi I retrived value from JSON and stored in NSMutableArray. I have tried this like Singleton. I have used empty swift file for this. Datas successfully retrieved and stored in NSMutableArray which is already declared in mainViewController. Then, if I use that NSMutableArray value in mainViewController, it shows empty array.
My coding is below. Kindly guide me.
Empty Swift File
public class json_file{
var prod_Obj = product_mainVC()
class var shared: json_file
{
struct Static
{
static let instance: json_file = json_file()
}
return Static.instance
}
func dataFromJSON()
{
let url = NSURL(string: "http://........--...4900a20659")!
var data : NSData = NSData(contentsOfURL: url, options: NSDataReadingOptions.DataReadingMapped, error: nil)!
var dict: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
let dataArray = dict["data"] as [[String:AnyObject]] // The array of dictionaries
for object in dataArray {
let category_name = object["category_name"] as String
prod_Obj.ct_name_arr.addObject(category_name)
let category_child = object["category_child"] as [[String:AnyObject]]
for child in category_child {
let sub_category_name = child["sub_category_name"] as String
prod_Obj.sub_ct_name_arr.addObject(sub_category_name)
}
}
println(prod_Obj.ct_name_arr) //Here value is Getting
println(prod_Obj.sub_ct_name_arr) //Here value is Getting
}
}
viewDidLoad
{
json_file.shared.dataFromJSON()
println(ct_name_arr) //Prints Empty Array [Intially Declared as NSMutableArray]
println(sub_ct_name_arr) //Prints Empty Array [Intially Declared as NSMutableArray]
}
I was trying understand the problem, but I can't see the product_mainVC. Because this I remake your class with little modifications.
class JsonFile
{
private(set) var categoryNames:[String];
private(set) var subCategoryNames:[String];
class let shared:JsonFile = JsonFile();
private init()
{
self.categoryNames = [];
self.subCategoryNames = [];
}
func dataFromJson()
{
let url = NSURL(string: "http://........--...4900a20659")!
if let data : NSData = NSData(contentsOfURL: url, options: NSDataReadingOptions.DataReadingMapped, error: nil)
{
if let dict: NSDictionary! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as? NSDictionary
{
if let dataArray = dict["data"] as? [[String:AnyObject]] // The array of dictionaries
{
for object in dataArray {
let category_id = object["category_id"] as Int
let category_name = object["category_name"] as String
categoryNames.append(category_name);
let category_child = object["category_child"] as [[String:AnyObject]]
for child in category_child {
let sub_category_id = child["sub_category_id"] as Int
let sub_category_name = child["sub_category_name"] as String
subCategoryNames.append(sub_category_name);
}
}
}
}
}
println(categoryNames);
println(subCategoryNames);
}
}
I did
Modify your way to do Singleton to a safe and more simple mode, create the arrays categoryNames and subCategoryNames internal in class because this is better to manipulate, and protect your fetch data to safe from possibles crash.
Implementation
JsonFile.shared.dataFromJson();
println("count categoryNames");
println(JsonFile.shared.categoryNames.count);
println("count subCategoryNames");
println(JsonFile.shared.subCategoryNames.count);
You need think about
This code is sync, and because this if you have a big data or request slow, the main thread from your application will freeze waiting return and it is bad for your user. Think if is necessary be sync.
let category_id = object["category_id"] as Int is never used. Why do you stay with this in code?