如何防止mapview被更新

Question

我对iPhone的编程很陌生,但我在其中制作了一个只有MKMapView的应用程序.我让它放大到我的位置但我不断更新位置.我的观点是,我希望它停止自动定位我,它仍然可以继续,但我只想让它停止定位.当我向任何方向滑动时,它会迫使我回到我的位置,或者当我散步并更新位置时.我的想法是,我希望应用程序使用一些注释.

一些代码

- (void) mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    NSLog(@"Found your location!");
    MKCoordinateRegion mapregion;
    map.showsUserLocation = YES;
    mapregion.center.latitude = map.userLocation.coordinate.latitude;
    mapregion.center.longitude = map.userLocation.coordinate.longitude;
    mapregion.span = MKCoordinateSpanMake(0.005,0.005);
    [map setRegion:mapregion animated:YES];
    map.userLocation.title = @"You're here";
    // map.mapType =  MKUserTrackingModeNone;

    // (found this on apple developer site, I think this can 
    // help but I have no clue at all //someone know what you can use this for?)
}

// In case you have the flightmode on...
- (void)mapView:(MKMapView *)mapView didFailToLocateUserWithError:(NSError *)error 
{
    NSLog(@"gick inte att hitta position!");
    map.showsUserLocation = YES;
    MKCoordinateRegion mapregion;
    mapregion.center.latitude =(59.329444);
    mapregion.center.longitude =(18.068611);
    mapregion.span.latitudeDelta = 0.03;
    mapregion.span.longitudeDelta = 0.03;
    mapregion = [map regionThatFits:mapregion];
    [map setRegion:mapregion animated:TRUE];
}

- (void)viewDidLoad
{
    [locationManager setDistanceFilter:kCLDistanceFilterNone];
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    map.delegate = self;
}

我真的希望有人知道如何做到这一点......

Answer 1

您的问题是,每次更新用户位置时,您都要设置地图的中心.这是您的标题中的一个解决方案:

BOOL userLocationShown;

然后...

- (void) mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    if(userLocationShown) return;
    // ... your code
    userLocationShown = YES;
}

或者,如果您不希望将地图置于用户的中心,则可以删除以下行:

    mapregion.center.latitude = map.userLocation.coordinate.latitude;
    mapregion.center.longitude = map.userLocation.coordinate.longitude;
    mapregion.span = MKCoordinateSpanMake(0.005,0.005);
    [map setRegion:mapregion animated:YES];

Answer 2

如果设备仍在获取位置更新,即使您忽略它们,它也会运行GPS并烧毁电池.一旦您锁定了他们的位置,或者通过检查他们移动了多少次,或者测量修复的准确性(CLLocation.horizo​​ntalAccuracy),您可以简单地关闭地图视图上的位置更新,如下所示:

self.showsUserLocation = NO;

如果您一直在使用CLLocationManager,那就是

[locationManager stopUpdatingLocation];