Variable value get empty in iOS swift - ios

Question

I have create computed property for store the strTokenValue and send it to the web services.
private var strTokenValue = String()
var tokenValue: String {
get {
if strTokenValue != "" {
return strTokenValue
}
else {
if let token = StrongBoxController.sharedInstance.keychainStore.unarchive(objectForKey: "TokenValue") as? Data {
strTokenValue = StrongBoxController.sharedInstance.convertDataToString(value: token)
return strTokenValue
}
else {
return ""
}
}
}
set {
strTokenValue = ""
StrongBoxController.sharedInstance.saveValues(value: "\(newValue)", key: “TokenValue”)
}
}
We have send every user action Asynchronously and we have not wait for success response for track function web services, So i have not added success and failure response in the below code.
func track(actionTaken: String,incidentNumber: String,message: String,completion:#escaping(_ success: Bool, _ error: String,_ actionTakenName: String) -> Void ) {
DispatchQueue.global(qos: .background).async {
let url = "\(ServerCommunication.sharedInstance.getDomainBaseUrl())api/track"
let parameters = [
“token_value” : self.tokenValue,
"device_os":"iOS",
"device_type": UIDevice.modelName,
"action_taken": actionTaken,
"message" : message,
]
}
}
We have called the one more web service to send the image and tokenValue.
Request:
“token_value” : “”,
"device_os":"iOS",
"device_type": “iPhone X”,
"action_taken": “Image captured”,
"message" : “”,
func convertDataToString(value: Data) -> String {
return String(decoding: value, as: UTF8.self)
}
public func unarchive(objectForKey key:String) -> Any? {
guard let data = self.data(forKey: key) else {
return nil
}
let unarchiver = NSKeyedUnarchiver(forReadingWith: data as Data)
return unarchiver.decodeObject(forKey: key)
}
#objc func saveValues(value : String, key: String) {
_ = self.keychainStore.archive(convertStringToData(value: value), key: key, accessibility: kSecAttrAccessibleWhenUnlockedThisDeviceOnly)
}
Both web services called simultaneously and “tokenValue” get empty in trackActions web services in some scenarios

Answer 1

It seems the problem is that you save data using convertStringToData which doesn't probably use convertStringToData. I think so because of convertDataToString doesn't use NSKeyedAarchiver.
In order to resolve, you should use unarchive.
To save the data use
func convertDataToString(value: Data) -> String? {
return String(data: value, encoding: .utf8)
}
func convertStringToData(value: String) -> Data? {
return value.data(using: .utf8)
}
and
keychainStore.archive(convertStringToData(value: value), key: key, accessibility: kSecAttrAccessibleWhenUnlockedThisDeviceOnly)
stored = convertDataToString(StrongBoxController.sharedInstance.keychainStore.unarchive(objectForKey: "TokenValue"))