문제 설명
MKMapView에서 사용자 위치를 찾는 데 문제가 있음 (Problems Trying to Find User Location in MKMapView)
사용자의 현재 위치를 MKMapView에 표시하는 데 문제가 있습니다. 관련 코드는 다음과 같습니다.
헤더:
// ParkingMapViewController.m
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface ParkingMapViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate> {
MKMapView *mapView;
CLLocationManager *locationManager;
}
@property (nonatomic, retain) IBOutlet MKMapView *mapView;
@property (nonatomic, retain) CLLocationManager *locationManager;
‑(void)loadAnnotations;
‑(void)showCurrentLocationButtonTapped:(id)sender;
@end
구현(일부):
// 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];
}
애플리케이션을 실행할 때 지도 보기는 주석 및 모든 것과 함께 잘 표시되지만 현재 위치 버튼을 누르면 지도가 새 위치로 다시 중앙에 돌아오고(약간 이동) 잠시 후, 충돌한다. [mapView setShowsUserLocation:YES];를 주석 처리하면 문제가 없지만 그렇지 않으면 콘솔에 다음 오류가 발생합니다.
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'
인터넷 검색에서 이것이 IB 문제일 가능성이 가장 높은 것으로 나타났지만 발견할 수 없었습니다. 다음은 IB에서 설정한 화면입니다.
어떤 도움이든 대단히 감사하겠습니다. 감사합니다!
참조 솔루션
방법 1:
The problem looks like it is in the viewForAnnotation method. The code is trying to call annotationType on the MKUserLocation annotation (which doesn't have such a method).
In viewForAnnotation, it should check what kind of annotation the view is being requested for and handle accordingly.
However, if you are using the MKMapView, you don't need to use CLLocationManager to get the user's current location. Just setting showsUserLocation to YES will make the map view show a blue dot where the user is located.
In either case, the viewForAnnotation method needs to check the annotation class type first. Something like this should be at the top:
‑ (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
if ([annotation isKindOfClass:MKUserLocation.class]) {
//it's the built‑in user location annotation, return nil to get default blue dot...
return nil;
}
//handle your custom annotations...
}
(by Stunner、user467105)