0
我正在研究一個旨在在地圖上顯示活動期間iPhone的位置（在它們之間添加註釋和繪圖線）的應用程序。[iOS] [背景] [CLLocationManager]地圖精度不高
爲此，我使用位置管理器來獲取新位置並通知MapDisplayViewController。當使用模擬器時，我得到了很好的結果，你可以在這裏看到http://www.youtube.com/watch?v=ESLIYSU_Mqw但用iPhone我得到了奇怪的結果，如200米錯誤。
我也使用MKMapView來顯示設備的位置。用這些設置（下一個代碼塊）我得到了那個http://grab.by/mgUU。
如果我顯示用戶位置我得到不同的結果，這是正常的嗎？
- (void)setupMap {
self.mapView.delegate = self;
[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
[self.mapView setUserInteractionEnabled:NO];
[self.mapView setShowsUserLocation:NO];
[self.mapView setZoomEnabled:NO];
[self.waitingView start];
}
下面的截圖與真實的設備：
編輯：的差異來櫨我用於這些2案件，使用了獲取設備當前位置的兩種不同的方式：
- 從MapView的手柄，當應用程序被激活
- 從位置管理器手柄時，應用程序在後臺
是否一個好主意，這兩個位置的系統混用？
我也測試這個解決方案CLLocationManager and accuracy issues - any experiences?但我得到了同樣的結果。
感謝;）
安裝位置經理：
- (void)setup {
self.locationManager = [CLLocationManager new];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.isUpdatingLocation = NO;
}
通知：時，在後臺添加的位置：
- (void)doUpdateWithLocation:(CLLocation *)location {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self beginBackgroundUpdateTask];
NSLog(@"%s do update in background %@", __PRETTY_FUNCTION__, location);
if (self.userLocationFound == NO && self.isUpdatingLocation == YES) {
self.startCoordinate = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude);
self.userLocationFound = YES;
}
else if (self.isUpdatingLocation) {
static int distance;
ABGPSPosition *position = [[ABGPSPosition alloc] init];
position.startPoint = MKMapPointForCoordinate(self.startCoordinate);
position.endPoint = MKMapPointForCoordinate(location.coordinate);
//INFO: Get the distance between this new point and the previous point.
CLLocationDistance metersApart = MKMetersBetweenMapPoints(position.startPoint, position.endPoint);
if (metersApart > MINIMUM_DELTA_METERS) {
MKMapPoint points[2] = {position.startPoint, position.endPoint};
distance += metersApart;
NSLog(@"%s - %d", __PRETTY_FUNCTION__, distance);
NSInteger count = [self.measurementArray count];
[self willChange:NSKeyValueChangeInsertion
valuesAtIndexes:[NSIndexSet indexSetWithIndex:count] forKey: @"measurementArray"];
[self.measurementArray insertObject:location atIndex:count];
[self didChange:NSKeyValueChangeInsertion
valuesAtIndexes:[NSIndexSet indexSetWithIndex:count] forKey: @"measurementArray"];
self.startCoordinate = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude);
}
}
[self endBackgroundUpdateTask];
});
}
MapDisplayViewController獲得新的位置：
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:keyPathMeasurementArray]) {
if ([change[NSKeyValueChangeKindKey] intValue] == NSKeyValueChangeInsertion) {
NSIndexSet *insertedIndexSet = change[NSKeyValueChangeIndexesKey];
[insertedIndexSet enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
CLLocation *location = self.locationManager.measurementArray[idx];
MKUserLocation *userLocation = [[MKUserLocation alloc] init];
[userLocation setCoordinate:location.coordinate];
NSLog(@"%s - didUpdateUserLocation", __PRETTY_FUNCTION__);
[self.locationBackgroundList addObject:userLocation];
NSLog(@"%s | %@", __PRETTY_FUNCTION__, self.locationBackgroundList);
}];
}
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
MapDisplayViewController添加註釋新的地圖視圖：
- (void)handleAddLocations {
NSLog(@"%s | %@", __PRETTY_FUNCTION__, self.locationBackgroundList);
if ([self.locationBackgroundList count] > 0) {
for (MKUserLocation *backgroundUserLocation in self.locationBackgroundList) {
{
LocAnnotation* annotation = [[LocAnnotation alloc] initWithCoordinate:backgroundUserLocation.coordinate];
NSLog(@"%s %@", __PRETTY_FUNCTION__, [backgroundUserLocation description]);
[self.mapView addAnnotation:annotation];
}
[self mapView:self.mapView didUpdateUserLocation:backgroundUserLocation];
}
NSString *message = [NSString stringWithFormat:@"%s | Annotation number: %d", __PRETTY_FUNCTION__, [self.locationBackgroundList count]];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Debug" message:message delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
[alert show];
[self.locationBackgroundList removeAllObjects];
self.locationBackgroundList = [[NSMutableArray alloc] init];
}
}