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POProblems Trying to Find User Location in MKMapView
 

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  1. POProblems Trying to Find User Location in MKMapView
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    <p>I am having problems trying to get the user's current position to display on an MKMapView. Here is the relevant code:</p> <p><em>Header:</em></p> <pre><code>// ParkingMapViewController.m #import &lt;UIKit/UIKit.h&gt; #import &lt;MapKit/MapKit.h&gt; @interface ParkingMapViewController : UIViewController &lt;MKMapViewDelegate, CLLocationManagerDelegate&gt; { MKMapView *mapView; CLLocationManager *locationManager; } @property (nonatomic, retain) IBOutlet MKMapView *mapView; @property (nonatomic, retain) CLLocationManager *locationManager; -(void)loadAnnotations; -(void)showCurrentLocationButtonTapped:(id)sender; @end </code></pre> <p><em>Implementation(partial):</em></p> <pre><code>// ParkingMapViewController.m - (void)viewDidLoad { [super viewDidLoad]; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:100 target:self action:@selector(showCurrentLocationButtonTapped:)]; [self loadAnnotations]; CLLocationCoordinate2D centerCoord = { UCD_LATITUDE, UCD_LONGITUDE }; [mapView setCenterCoordinate:centerCoord zoomLevel:13 animated:NO]; //from "MKMapView+ZoomLevel.h" } - (void)showCurrentLocationButtonTapped:(id)sender { NSLog(@"Showing current location."); //[self.mapView setShowsUserLocation:YES]; //mapView.showsUserLocation = YES; //[sender setEnabled:NO]; //TODO: Uncomment and test locationManager = [[CLLocationManager alloc] init]; locationManager.delegate = self; locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m [locationManager startUpdatingLocation]; } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { [mapView setCenterCoordinate:newLocation.coordinate]; if ([mapView showsUserLocation] == NO) { [mapView setShowsUserLocation:YES];//when this line is commented, there is no problem } [mapView setCenterCoordinate:newLocation.coordinate zoomLevel:13 animated:YES]; } - (void)viewDidUnload { [super viewDidUnload]; [mapView setShowsUserLocation:NO]; } - (void)dealloc { [locationManager release]; [mapView release]; [super dealloc]; } </code></pre> <p>When running the application, the map view displays just fine with the annotations and everything, but when the current location button is pressed, the map re-centers to its new location(slight move) and a fraction of a second later, it crashes. When I comment out <code>[mapView setShowsUserLocation:YES];</code> there is no problem, but otherwise it spits out this error in the console:</p> <pre><code>2010-11-30 22:57:20.657 Parking[53430:207] -[MKUserLocation annotationType]: unrecognized selector sent to instance 0x78427f0 2010-11-30 22:57:20.659 Parking[53430:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MKUserLocation annotationType]: unrecognized selector sent to instance 0x78427f0' *** Call stack at first throw: ( 0 CoreFoundation 0x0266ab99 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x027ba40e objc_exception_throw + 47 2 CoreFoundation 0x0266c6ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x025dc2b6 ___forwarding___ + 966 4 CoreFoundation 0x025dbe72 _CF_forwarding_prep_0 + 50 5 Parking 0x00003ddb -[ParkingMapViewController mapView:viewForAnnotation:] + 64 6 MapKit 0x023a8130 -[MKAnnotationContainerView _addViewForAnnotation:] + 175 7 MapKit 0x023a2b2a -[MKAnnotationContainerView _addViewsForAnnotations:animated:] + 251 8 MapKit 0x0239e657 -[MKAnnotationContainerView showAddedAnnotationsAnimated:] + 137 9 MapKit 0x0237837c -[MKMapView _showAddedAnnotationsAndRouteAnimated:] + 102 10 MapKit 0x02376a88 -[MKMapViewInternal delayedShowAddedAnnotationsAnimated] + 191 11 Foundation 0x000571c9 __NSFireTimer + 125 12 CoreFoundation 0x0264bf73 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19 13 CoreFoundation 0x0264d5b4 __CFRunLoopDoTimer + 1364 14 CoreFoundation 0x025a9dd9 __CFRunLoopRun + 1817 15 CoreFoundation 0x025a9350 CFRunLoopRunSpecific + 208 16 CoreFoundation 0x025a9271 CFRunLoopRunInMode + 97 17 GraphicsServices 0x02f4900c GSEventRunModal + 217 18 GraphicsServices 0x02f490d1 GSEventRun + 115 19 UIKit 0x002cfaf2 UIApplicationMain + 1160 20 Parking 0x000020e0 main + 102 21 Parking 0x00002071 start + 53 ) terminate called after throwing an instance of 'NSException' </code></pre> <p>Googling has indicated that this is most likely an IB problem but I have not been able to spot it. Here is a screen of my set up in IB:</p> <p><img src="https://i.stack.imgur.com/hnlpX.png" alt="alt text"></p> <p>Any help whatsoever will be very much appreciated. Thanks!</p>
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