Swift3: [String: AnyObject] using NSCoding protocol to save with NSUserDefaults - swift

Question

I have my custom class:
private class PendingRequest : NSObject, NSCoding
{
var route : String!
var params: [String: AnyObject]!
init(route: String, params: [String: AnyObject])
{
self.route = route
self.params = params
}
required init(coder aDecoder: NSCoder)
{
self.route = aDecoder.decodeObject(forKey: "route") as! String
self.params = aDecoder.decodeObject(forKey: "params") as! [String: AnyObject]
}
public func encode(with coder: NSCoder)
{
coder.encode(route, forKey: "route")
coder.encode(params, forKey: "params")
}
}
And here is how I save my list of PendingRequest:
private static func savePendingRequests(requestsToSend: [PendingRequest])
{
let data = NSKeyedArchiver.archivedData(withRootObject: requestsToSend!)
UserDefaults.standard.set(data, forKey: self.requestsToSendDefaultsString)
}
And here is how I try to retrieve it:
let data = UserDefaults.standard.data(forKey: requestsToSendDefaultsString)
let requests = NSKeyedUnarchiver.unarchiveObject(with: data!) as! [PendingRequest]
return requests
But my code crashes when retrieving my data... Saving works fine, but not retrieving... Any idea?
EDIT: Here is my Crashlytics error:
*** -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (_TtCC6Versus9VersusAPIP33_8D2B8AA415FDC4F8DFAF29D7ECE33C1F14PendingRequest) for key (NS.objects); the class may be defined in source code or a library that is not linked
SOLUTION:
My class PendingRequest was fileprivate, thus NSKeyedUnarchiver couldn't access it, hence the crash... Thanks for your help.

Answer 1

Few things are incorrect
you're forgetting to call super.init() in your initializers
init(route: String, params: [String: AnyObject])
{
self.route = route
self.params = params
super.init()
}
required init(coder aDecoder: NSCoder)
{
self.route = aDecoder.decodeObject(forKey: "route") as? String
self.params = aDecoder.decodeObject(forKey: "params") as? [String: AnyObject]
// Check if route and params are what you expected here
super.init()
}
You have a static method that calls "self", I'm not sure this works, you could still have a static key or a global key.
Plus you're unwrapping a non-optional value "requestsToSend".
I think this would solve it.
private static func savePendingRequests(requestsToSend:[PendingRequest])
{
let data = NSKeyedArchiver.archivedData(withRootObject: requestsToSend)
UserDefaults.standard.set(data, forKey: "AStaticKey")
}
Then retrieving should work. (I added a few safety checks)
guard let data = UserDefaults.standard.data(forKey: "AStaticKey"),
let requests = NSKeyedUnarchiver.unarchiveObject(with: data) as? [PendingRequest] else {
return [PendingRequest]()
}
return requests