真正的聚類GMSMapView ios

Question

正如我從文檔理解真正subclussing只從MKMapView。是否有可能使用GoogleMaps的Realm羣集，或者我應該尋找其他SDK？

Answer 1

現在ABFRealmMapView被設計爲與MKMapView一起使用，但它可以擴展到使用Google Maps SDK。

實際進行聚類的內部組件是：ABFLocationFetchedResultsController。這允許您創建一個ABFLocationFetchRequest描述地圖搜索，然後它將獲取這些對象，或者啓用或不啓用羣集。您可以複製類ABFRealmMapView實際使用ABFLocationFetchedResultsController的方式，並將其移到Google地圖視圖的子類中。

導入代碼是在refreshMapView方法，（如果啓用autorefresh），其被自動調用響應於所述地圖被移動：

- (void)refreshMapView 
{ 
    @synchronized(self) { 
     [self.mapQueue cancelAllOperations]; 

     MKCoordinateRegion currentRegion = self.region; 

     ABFLocationFetchRequest *fetchRequest = 
     [ABFLocationFetchRequest locationFetchRequestWithEntityName:self.entityName 
                 inRealm:self.realm 
               latitudeKeyPath:self.latitudeKeyPath 
               longitudeKeyPath:self.longitudeKeyPath 
                 forRegion:currentRegion]; 

     if (self.basePredicate) { 
      NSCompoundPredicate *compPred = 
      [NSCompoundPredicate andPredicateWithSubpredicates:@[fetchRequest.predicate,self.basePredicate]]; 

      fetchRequest.predicate = compPred; 
     } 

     [self.fetchResultsController updateLocationFetchRequest:fetchRequest 
               titleKeyPath:self.titleKeyPath 
              subtitleKeyPath:self.subtitleKeyPath]; 

     typeof(self) __weak weakSelf = self; 

     NSBlockOperation *refreshOperation = [[NSBlockOperation alloc] init]; 

     NSBlockOperation __weak *weakOp = refreshOperation; 

     MKMapRect visibleMapRect = self.visibleMapRect; 

     ABFZoomLevel currentZoomLevel = ABFZoomLevelForVisibleMapRect(visibleMapRect); 

     if (self.clusterAnnotations && 
      currentZoomLevel <= self.maxZoomLevelForClustering) { 

      MKZoomScale zoomScale = MKZoomScaleForMapView(self); 

      [refreshOperation addExecutionBlock:^{ 
       if (![weakOp isCancelled]) { 
        [weakSelf.fetchResultsController performClusteringFetchForVisibleMapRect:visibleMapRect 
                       zoomScale:zoomScale]; 

        [weakSelf addAnnotationsToMapView:weakSelf.fetchResultsController.annotations]; 

        [weakSelf registerChangeNotification:weakSelf.autoRefresh]; 
       } 
      }]; 
     } 
     else { 
      [refreshOperation addExecutionBlock:^{ 
       if (![weakOp isCancelled]) { 
        [weakSelf.fetchResultsController performFetch]; 

        [weakSelf addAnnotationsToMapView:weakSelf.fetchResultsController.annotations]; 

        [weakSelf registerChangeNotification:weakSelf.autoRefresh]; 
       } 
      }]; 
     } 

     [self.mapQueue addOperation:refreshOperation]; 
    } 
}