So far, it seems to be working... The key was to add ArcGIS.h to the "Objective-C Bridging Header" setting under Swift Compiler - Code Generation of Build Settings.
import ArcGIS
import UIKit import ArcGIS  var tileUrl = "http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"  class ViewController: UIViewController {      @IBOutlet var mapView : AGSMapView          override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view, typically from a nib.                  var myLayer = AGSTiledMapServiceLayer(URL: NSURL(string: tileUrl))         mapView.addMapLayer(myLayer)     } }So far, it seems to be working... The key was to add ArcGIS.h to the "Objective-C Bridging Header" setting under Swift Compiler - Code Generation of Build Settings.
import ArcGIS
import UIKit import ArcGIS  var tileUrl = "http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"  class ViewController: UIViewController {      @IBOutlet var mapView : AGSMapView          override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view, typically from a nib.                  var myLayer = AGSTiledMapServiceLayer(URL: NSURL(string: tileUrl))         mapView.addMapLayer(myLayer)     } }