Swift app crashes with `unrecognized selector sent to instance` on CLLocationManager

Similar to many, many other questions on StackOverflow, I get a `unrecognized selector sent to instance` fault, when running my app. What makes my case different (I think) is that it is written in Swift and that the common reason is not the reason here. In this question the solution is to set the "Custom Class" in the Identity Inspector for that view to the responding class. I checked this and this is the case (note that I did rename the class at some point, but it now is definitely set to "ViewController"). I include the stack trace below as well as the code for `ViewController.swift`. You can also find all of the code here. I managed to avoid this problem by starting fresh, which enabled me to solve my earlier question. This new trial can be found in this branch. But, I want to know what is wrong and solve this. Some thought One question that I couldn't answer successfully is whether `CLLocationManagerDelegate` needs some required methods? But because I got it to work in the other branch, I suspect it's not necessary. ``` 2014-07-03 21:50:26.056 RowingTracker2[11416:60b] -[CLLocationManager requestWhenInUseAuthorization]: unrecognized selector sent to instance 0xa10c4a0 2014-07-03 21:50:26.059 RowingTracker2[11416:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CLLocationManager requestWhenInUseAuthorization]: unrecognized selector sent to instance 0xa10c4a0' *** First throw call stack: ( 0 CoreFoundation 0x008831e4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x01e2a8e5 objc_exception_throw + 44 2 CoreFoundation 0x00920243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275 3 CoreFoundation 0x0087350b ___forwarding___ + 1019 4 CoreFoundation 0x008730ee _CF_forwarding_prep_0 + 14 5 RowingTracker2 0x00003352 _TFC14RowingTracker214ViewController11viewDidLoadfS0_FT_T_ + 738 6 RowingTracker2 0x000033a2 _TToFC14RowingTracker214ViewController11viewDidLoadfS0_FT_T_ + 34 7 UIKit 0x0102f33d -[UIViewController loadViewIfRequired] + 696 8 UIKit 0x0102f5d9 -[UIViewController view] + 35 9 UIKit 0x00f4f267 -[UIWindow addRootViewControllerViewIfPossible] + 66 10 UIKit 0x00f4f5ef -[UIWindow _setHidden:forced:] + 312 11 UIKit 0x00f4f86b -[UIWindow _orderFrontWithoutMakingKey] + 49 12 UIKit 0x00f5a3c8 -[UIWindow makeKeyAndVisible] + 65 13 UIKit 0x00f0abc0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 2097 14 UIKit 0x00f0f667 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824 15 UIKit 0x00f23f92 -[UIApplication handleEvent:withNewEvent:] + 3517 16 UIKit 0x00f24555 -[UIApplication sendEvent:] + 85 17 UIKit 0x00f11250 _UIApplicationHandleEvent + 683 18 GraphicsServices 0x031fff02 _PurpleEventCallback + 776 19 GraphicsServices 0x031ffa0d PurpleEventCallback + 46 20 CoreFoundation 0x007feca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53 21 CoreFoundation 0x007fe9db __CFRunLoopDoSource1 + 523 22 CoreFoundation 0x0082968c __CFRunLoopRun + 2156 23 CoreFoundation 0x008289d3 CFRunLoopRunSpecific + 467 24 CoreFoundation 0x008287eb CFRunLoopRunInMode + 123 25 UIKit 0x00f0ed9c -[UIApplication _run] + 840 26 UIKit 0x00f10f9b UIApplicationMain + 1225 27 RowingTracker2 0x00008021 top_level_code + 97 28 RowingTracker2 0x0000805b main + 43 29 libdyld.dylib 0x024ff701 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) ``` ViewController.swift ``` import UIKit import MapKit import CoreLocation class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate { @IBOutlet var mapview: MKMapView = nil var locationmgr : CLLocationManager! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. locationmgr = CLLocationManager() locationmgr.delegate = self locationmgr.requestWhenInUseAuthorization() ///< Offending line. // mapview.showsUserLocation = true } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } ```