Swift wrapper for Mapbox Static API

ServerSideSnapshot.swift

import UIKit
import CoreLocation

struct ServerSideSnapshot {
    let MaximumDimension: CGFloat = 1280
    
    var size: CGSize
    
    var centerCoordinate: CLLocationCoordinate2D
    var zoomLevel: Double
    var direction: CLLocationDirection
    var pitch: CGFloat
    
    var style: Style
    
    var showsAttribution: Bool
    var showsLogo: Bool
    
    var URL: NSURL? {
        guard let styleID = style.identifier else {
            return nil
        }
        let width = Int(min(round(size.width), MaximumDimension))
        let height = Int(min(round(size.height), MaximumDimension))
        let scaleFactor = Int(round(UIScreen.mainScreen().scale))
        let scaleSuffix = scaleFactor != 1 ? "@\(scaleFactor)x" : ""
        let accessToken = style.accessToken ?? SiriusDefaultStyleAccessToken
        return NSURL(string: "https://api.mapbox.com/styles/v1/\(styleID)/static/\(centerCoordinate.longitude),\(centerCoordinate.latitude),\(zoomLevel),\(direction),\(pitch)/\(width)x\(height)\(scaleSuffix)?access_token=\(accessToken)")
    }
}