我正在尝试使用didUpdateToLocation:newLocation:fromLocation:oldLocation:
方法获取用户当前的最新位置,并将其存储在我的ivar CLLocation *userCurrentLocation
当我尝试读取userCurrentLocation
时出现此错误-[NSCFNumber coordinate]: unrecognized selector sent to instance 0x586b220
- (void) locationManager:(CLLocationManager *) manager
didUpdateToLocation:(CLLocation *) newLocation
fromLocation:(CLLocation *) oldLocation {
fromLocation:(CLLocation *) oldLocation {
if (oldLocation == nil) { // first time loading?
SVGeocoder *geocodeRequest = [[SVGeocoder alloc]
initWithCoordinate:CLLocationCoordinate2DMake(newLocation.coordinate.latitude, newLocation.coordinate.longitude)];
[geocodeRequest setDelegate:self];
[geocodeRequest startAsynchronous]; // reverse geocoding to get annotation coordinates to be placed.
[geocodeRequest release];
isCurrentLocation = YES; //flag that next annotation placed is current location
}
userCurrentLocation = newLocation;
NSLog(@"didUpdateToLocation - Lat:%f Long:%f", userCurrentLocation.coordinate.latitude, userCurrentLocation.coordinate.longitude); // verified that userCurrentLocation latitude is correct at this point.
}
工具栏按钮显示用户当前位置
-(IBAction) showLocation:(id) sender {
NSLog(@"Lat:%f Long:%f", userCurrentLocation.coordinate.latitude, userCurrentLocation.coordinate.longitude); // crashes upon calling this statement. Why?
NSLog(@"Show Location Called");
SVGeocoder *geocodeRequest = [[SVGeocoder alloc]
initWithCoordinate:CLLocationCoordinate2DMake(userCurrentLocation.coordinate.latitude, userCurrentLocation.coordinate.longitude)];
[geocodeRequest setDelegate:self];
[geocodeRequest startAsynchronous];
[geocodeRequest release];
}
我确实设置了属性并合成了userCurrentLocation:
MapViewController.h
@interface MapViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate> {
CLLocation *userCurrentLocation;
}
@property (nonatomic, retain) CLLocation *userCurrentLocation;
@end
MapViewController.m
@synthesize userCurrentLocation;
/* EDITED */
- (void)viewDidLoad {
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
[locationManager startUpdatingLocation];
userCurrentLocation = [[CLLocation alloc] init];
}
答案 0 :(得分:5)
- (void)viewDidLoad {
mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0,46,320,370)];
[mapView setDelegate:self];
[mapView setShowsUserLocation:TRUE];
[self.view addSubview:mapView];
[mapView setMapType:MKMapTypeStandard];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
if(locationManager.locationServicesEnabled)
{
[locationManager startUpdatingLocation];
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
LatNLon = newLocation.coordinate;
NSLog(@"%f %f",LatNLon.latitude,LatNLon.longitude);
MKReverseGeocoder *geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:LatNLon];
[geocoder setDelegate:self];
[geocoder start];
isVisit=0;
[locationManager stopUpdatingLocation];
}
答案 1 :(得分:5)
userCurrentLocation
方法完成后,- (void) locationManager:(CLLocationManager *) manager didUpdateToLocation:(CLLocation *) newLocation fromLocation:(CLLocation *) oldLocation
已自动释放。
请尝试使用self.userCurrentLocation = newLocation;
。
答案 2 :(得分:0)
这是UIScrollView中UIPageControl的代码 这里我们使用UIScrollView的委托
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
int pageIndex=scrollView.contentOffset.x / scrollView.frame.size.width;
self.pageCntrl.currentPage=pageIndex;
}
答案 3 :(得分:0)
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
CLLocation *currentUserLocation = [locations lastObject];
NSLog(@"lat%f - lon%f", currentUserLocation.coordinate.latitude, currentUserLocation.coordinate.longitude);
CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = currentUserLocation.coordinate.latitude;
zoomLocation.longitude= currentUserLocation.coordinate.longitude;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.2*METERS_PER_MILE, 0.2*METERS_PER_MILE);
[mapView setRegion:viewRegion animated:YES];
[locationManager stopUpdatingLocation];
}