MTSymbolLayer

constructor(identifier: String, sourceIdentifier: String)
constructor(identifier: String, sourceIdentifier: String, icon: Bitmap)
constructor(identifier: String, sourceIdentifier: String, maxZoom: Double, minZoom: Double, sourceLayer: String)
constructor(identifier: String, sourceIdentifier: String, maxZoom: Double, minZoom: Double, sourceLayer: String, icon: Bitmap, visibility: MTLayerVisibility)