Closure:Use Unresolved Identifier 'Self'

Swift - Use of unresolved identifier 'self' - from Closure in a Class

Rahul's explanation is correct, but the suggested answer is ever so slightly incomplete.

Here is a complete solution:

1. Declare the doSomething property as lazy as Rahul suggested. A lazy stored property is a property whose initial value is not calculated until the first time it is used. In other words this closure will not be evaluated until the doSomething property is called at run-time, at which point self is guaranteed to exist. See Lazy Stored Properties in the Swift Programming Language for more details.

2. Add a type annotation to the doSomething property so the compiler doesn't have to infer the type at compile time, which apparently it can't do because the closure includes self. See Type Safety and Type Inference in the Swift Programming Language for more details.

So the complete declaration is:

...
lazy var doSomething: (Data?, URLResponse?, Error?) -> Void = { (data: Data?, response: URLResponse?, error: Error?) -> Void in
...

ps. Welcome to Swift programming! It's a fantastic language and really fun. I hope you enjoy it as much as I do.

Use of Unresolved Identifier 'self' in swift

The formatting of the code makes it challenging to see what's going on, but it looks like the function audioStreamingDidLogin(:SPTAudioStreamingController!) is not a class function. Maybe global, because it's declared outside the class where self is available.

You may be able to:

• move it into the class
• pass some instance of ViewController into the method as a parameter

Moving it into the class makes most sense to me.

Edit: Fix code

class ViewController: UIViewController, SPTAudioStreamingPlaybackDelegate, SPTAudioStreamingDelegate  {
    // Variables
    var auth = SPTAuth.defaultInstance()!
    var session:SPTSession!

    // Initialzed in either updateAfterFirstLogin: (if first time login) or in viewDidLoad (when there is a check for a session object in User Defaults
    var player: SPTAudioStreamingController?
    var loginUrl: URL?

    // Outlets
    @IBOutlet weak var loginSpotify: UIButton!
    @IBOutlet weak var testLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.setup()
    }

    func setup () {
        // insert redirect your url and client ID below
        let redirectURL = "splitter-app://callback" // put your redirect URL here
        let clientID = "client id goes here" // put your client ID here
        auth.redirectURL     = URL(string: redirectURL)
        auth.clientID        = "client id goes here"
        auth.requestedScopes = [SPTAuthStreamingScope, SPTAuthPlaylistReadPrivateScope, SPTAuthPlaylistModifyPublicScope, SPTAuthPlaylistModifyPrivateScope]
        loginUrl = auth.spotifyWebAuthenticationURL()
        print("test")
    }

    func initializePlayer(authSession:SPTSession){
        if self.player == nil {
            self.player = SPTAudioStreamingController.sharedInstance()
            self.player!.playbackDelegate = self
            self.player!.delegate = self
            try! player!.start(withClientId: auth.clientID)
            self.player!.login(withAccessToken: authSession.accessToken)
        }
    }

    func updateAfterFirstLogin ()  {
        loginSpotify.isHidden = true
        let userDefaults = UserDefaults.standard
        if let sessionObj:AnyObject = userDefaults.object(forKey: "SpotifySession") as AnyObject? {
            let sessionDataObj = sessionObj as! Data
            let firstTimeSession = NSKeyedUnarchiver.unarchiveObject(with: sessionDataObj) as! SPTSession
            self.session = firstTimeSession
            initializePlayer(authSession: session)
        }
    }

    func initializaPlayer(authSession:SPTSession){
        if self.player == nil {
            self.player = SPTAudioStreamingController.sharedInstance()
            self.player!.playbackDelegate = self
            self.player!.delegate = self
            try! player?.start(withClientId: auth.clientID)
            self.player!.login(withAccessToken: authSession.accessToken)
        }
    }

    func audioStreamingDidLogin(_ audioStreaming: SPTAudioStreamingController!) {
        // after a user authenticates a session, the SPTAudioStreamingController is then initialized and this method called
        print("logged in")
        self.player?.playSpotifyURI("spotify:track:58s6EuEYJdlb0kO7awm3Vp", startingWith: 0, startingWithPosition: 0, callback: { (error) in
            if (error != nil) {
                print("playing!")
            }
        })
    }
}

Use of unresolved identifier self

This situation happens when self is not defined, please make sure that you are trying to add startMonitoring() function to a class, extension or struct's scope.

Use of unresolved identifier 'self' (CoreData)

Remove the } on this line

@IBOutlet weak var Table_label: UILabel!
    }

and put another } at the end of this file.

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