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如果我想在地图上显示 userLocation 并同时记录用户的位置，将观察者添加到 userLocation.location 并记录位置是否是个好主意，或者我应该仍然使用 CLLocationManager 来记录用户位置并使用mapView.showUserLocation 显示用户的当前位置（蓝色指示器）？我想显示 MapKit API 支持的默认蓝色指示器。

另外，这是一个粗略的示例代码：

- (void)viewDidLoad {
    ...

    locationManager = [[CLLocationManager alloc] init]; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    locationManager.distanceFilter = DISTANCE_FILTER_VALUE;
    locationManager.delegate = self; 
    [locationManager startUpdatingLocation];

    myMapView.showUserLocation = YES;
    [myMapView addObserver:self forKeyPath:@"userLocation.location" options:0 context:nil];

    ...
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    // Record the location information
    // ...
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { 
    NSLog(@"%s begins.", __FUNCTION__);

    // Make sure that the location returned has the desired accuracy
    if (newLocation.horizontalAccuracy <= manager.desiredAccuracy)
        return;

    // Record the location information
    // ...
}

在幕后，我认为 MKMapView 还使用 CLLocationManager 来获取用户的当前位置？那么，这是否会产生任何问题，因为我相信 CLLocationManager 和 MapView 都会尝试使用相同的位置服务？是否会有任何冲突和缺乏准确/必需或当前的数据？

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1 回答 1

1

See this SO entry: CLLocationManager uses the same data across all of its instances, so there is no conflict.

于 2010-04-07T08:07:10.097 回答