let view = ... // Your UIView subclass here
view.addParticlesAnimation(effect: ParticleEffect.Fire) // Use a built-in effect
view.addParticlesAnimation(emitter: emitter) // Use your own SKEmitterNode

var loadingView: ParticlesLoadingView = {
    let view = ParticlesLoadingView(frame: 0, y: 0, width: 75, height: 75))
    view.particleEffect = .Spark
    view.duration = 1.5
    view.layer.cornerRadius = 15.0
    return view
}()

// OR provide your own SKEmitterNode

let emitter = NSKeyedUnarchiver.unarchiveObjectWithFile(NSBundle.mainBundle().pathForResource("Spark", ofType: "sks")!) as? SKEmitterNode
if let emitter = emitter { 
    loadingView.scene.emitterNode = emitter
   	loadingView.startAnimating()
}

/// Duration in seconds of the animation to complete a tour on the border of the view.
public var duration = 2.0
    
/// The size of each particle image. This value is used to calculate the inner padding of the view path so that the emitted particles are visible.
public var particlesSize: CGFloat = 5.0
    
/// The emitter of particles that is animated along the border of the view.
public var emitterNode: SKEmitterNode? = nil