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// Set up your app's URL Types and URL schemes.

// Add the following to your AppDelegate:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    SpotifyLogin.shared.configure(clientID: <#T##String#>, clientSecret: <#T##String#>, redirectURL: <#T##URL#>)
    return true
}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

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let mapViewClass = ObjectiveClass<MKMapView>()
let selectors = mapViewClass.selectors // An array of selectors.
let properties = mapViewClass.properties // An array of properties.
mapViewClass.addSelector(#selector(testSelector), from: self.classForCoder)

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let workItem = DispatchWorkItem(qos: .userInitiated, flags: .assignCurrentContext) {
    // Do stuff
}
queue.async(execute: workItem)

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let queue = DispatchQueue.global(attributes: .qosUserInitiated)
let mainQueue = DispatchQueue.main

mainQueue.async {
    dispatchPrecondition(condition: .notOnQueue(mainQueue))
    // This code won't execute
}

queue.async {
    dispatchPrecondition(condition: .onQueue(queue))

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let delay = DispatchTime.now() + .seconds(60)
DispatchQueue.main.after(when: delay) {
    // Do something
}

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DispatchQueue.global(attributes: [.qosDefault]).async { 
    // Background thread
    DispatchQueue.main.async(execute: { 
        // UI Updates
    })
}

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// Examples of dispatch_once replacements with global or static constants and variables. 
// In all three, the initialiser is called only once. 

// Static properties (useful for singletons).
class Object {
    static let sharedInstance = Object()
}

// Global constant.
let constant = Object()

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// Create a UIViewPropertyAnimator object. Here's a simple one with a UIKit animation curve:
let colorChange = UIViewPropertyAnimator(duration: 0.3, curve: .easeIn, animations: { [weak self] in
      self?.view.backgroundColor = UIColor(red: 255.0/255.0, green: 80.0/255.0, blue: 43.0/255.0, alpha: 1.0)
})

// There's also support for easy spring-based animations - all you need to set is a damping ratio (a value between 0 and 1). Alternatively, you can create your own curves by adopting the UITimingCurveProvider protocol.
let alphaChange = UIViewPropertyAnimator(duration: 0.3, dampingRatio: 0.6, animations: { [weak self] in
      self?.circleView.alpha = 0.0
})

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// Create interpolation object
let colorChange = Interpolate(from: UIColor.whiteColor(), to: UIColor.redColor(), apply: { [weak self] (color) in
      self?.view.backgroundColor = color
})

// For a gesture recognizer or delegate that reports every step of its progress (e.g. UIPanGestureRecognizer or a ScrollViewDidScroll) you can just apply the percentage directly to the Interpolate object
@IBAction func handlePan(recognizer: UIPanGestureRecognizer) {
    let translation = recognizer.translationInView(self.view)
    let translatedCenterY = view.center.y + translation.y
    let progress = translatedCenterY / self.view.bounds.size.height

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let altitude = distance*tan(M_PI*(75.0/180.0))