CLLocationManager startUpdatingLocation不起作用

Question

所以现在我至少得到以下代码的回调...

- (void)viewDidLoad {

[super viewDidLoad];
mapView=[[MKMapView alloc] initWithFrame:self.view.frame];
//mapView.showsUserLocation=TRUE;
mapView.delegate=self;
[self.view insertSubview:mapView atIndex:0];

NSLog(@"locationServicesEnabled: %@", [CLLocationManager locationServicesEnabled] ? @"YES":@"NO");
    CLLocationManager *newLocationManager = [[CLLocationManager alloc] init];
    [newLocationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    [newLocationManager setDistanceFilter:kCLDistanceFilterNone];
    [self setLocationManager:newLocationManager];


[[self locationManager] setDelegate:self];
[[self locationManager] startUpdatingLocation];
NSLog(@"Started updating Location");

}


- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

NSLog(@"Did update to location");
mStoreLocationButton.hidden=FALSE;
location=newLocation.coordinate;

MKCoordinateRegion region;
region.center=location;
MKCoordinateSpan span;
span.latitudeDelta=0.01;
span.longitudeDelta=0.01;
region.span=span;


[mapView setRegion:region animated:TRUE];


}

我可以在第二种方法中设置断点,NSLog报告连续的位置更新,但由于某种原因,带有span的缩放不起作用.知道为什么吗？它有我的坐标和一切.在这一个上刮我的头.

Answer 1

将CLLocationManager分配给类上的(强)属性.(我假设你正在使用ARC BTW.)现在CLLocationManager没有超过viewDidLoad方法的结尾,所以它也不会调用你的委托方法.

Answer 2

确保您已添加<CLLocationManagerDelegate>到@interface文件中.

编辑:

如果代理设置正确,请确保您使用的是您的locationManager财产:

在.h文件中:

@property (nonatomic, strong) CLLocationManager *locationManager;

在viewDidLoad:

self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager setDelegate:self];
[self.locationManager startUpdatingLocation];

Answer 3

我想,你可以通过两种方式完成这项工作:

1. 使用CLLocation框架

检查一下,您已经采用了带有CLLocationManagerDelegate方法的ViEWController

#import<MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController <CLLocationManagerDelegate, 
                                              MKMapViewDelegate>
{
    CLLocationCoordinate2D location;
    MKMapView *mapView;
}
@end

在ViewController.m中:

@implementation GSViewController
- (void)viewDidLoad {

    [super viewDidLoad];
    mapView=[[MKMapView alloc] initWithFrame:self.view.frame];
    mapView.showsUserLocation=TRUE;
    mapView.delegate=self;
    [self.view insertSubview:mapView atIndex:0];


    CLLocationManager *locationManager=[[CLLocationManager alloc] init];
    locationManager.delegate=self;
    locationManager.desiredAccuracy=kCLLocationAccuracyNearestTenMeters;

    [locationManager startUpdatingLocation];

}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{


    NSLog(@"new location: %@", newLocation);
    location=newLocation.coordinate;

    MKCoordinateRegion region;
    region.center=location;
    MKCoordinateSpan span;
    span.latitudeDelta=0.01;
    span.longitudeDelta=0.01;
    region.span=span;

    [mapView setRegion:region animated:TRUE];

}


-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"error: %@", error.description);
}
@end

2.使用相同的MKMapKit框架您可以使用名为didUpdateUserLocation的MKMapViewDelegate方法来执行此操作:此处您不需要CLLocaionManager,这将通过以下方式完成:在ViewController.h中:

#import <MapKit/MapKit.h>
@interface ViewController : UIViewController < MKMapViewDelegate>
{
    CLLocationCoordinate2D location;
    MKMapView *mapView;
}
@end

和在ViewController.m文件中:

@implementation GSViewController
- (void)viewDidLoad {

    [super viewDidLoad];
    mapView=[[MKMapView alloc] initWithFrame:self.view.frame];
    mapView.showsUserLocation=TRUE;
    mapView.delegate=self;
    [self.view insertSubview:mapView atIndex:0];

}

-(void)mapView:(MKMapView *)mapV didUpdateUserLocation:(MKUserLocation *)userLocation
{
    NSLog(@"map new location: %f %f", userLocation.coordinate.latitude, userLocation.coordinate.longitude);
    location=userLocation.coordinate;

    MKCoordinateRegion region;
    region.center=location;
    MKCoordinateSpan span;
    span.latitudeDelta=0.1;
    span.longitudeDelta=0.1;
    region.span=span;

    [mapV setRegion:region animated:TRUE];
}
@end