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  • 调用ClusterAnnotation文件夹下的代码能够实现poi点聚合,使用步骤如下:
  • 初始化coordinateQuadTree。
self.coordinateQuadTree = [[CoordinateQuadTree alloc] init];
  • 获得poi数组pois后,创建coordinateQuadTree。
  • 项目Demo通过关键字搜索获得poi数组数据,具体见工程。此处从获得poi数组开始说明。
  • 创建四叉树coordinateQuadTree来建立poi的四叉树索引。
  • 创建过程较为费时,建议另开线程。创建四叉树完成后,计算当前mapView下需要显示的annotation。
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    /* 建立四叉树. */
    [self.coordinateQuadTree buildTreeWithPOIs:respons.pois];
    dispatch_async(dispatch_get_main_queue(), ^{
            /* 计算当前mapView区域内需要显示的annotation. */
            NSLog(@"First time calculate annotations.");
            [self addAnnotationsToMapView:self.mapView];
  • 根据CoordinateQuadTree四叉树索引,计算当前zoomLevel下,mapView区域内的annotation。
- (void)addAnnotationsToMapView:(MAMapView *)mapView
    /* 判断是否已建树. */
    if (self.coordinateQuadTree.root == nil)
    /* 根据当前zoomLevel和zoomScale 进行annotation聚合. */
    double zoomScale = self.mapView.bounds.size.width / self.mapView.visibleMapRect.size.width;
    /* 基于先前建立的四叉树索引,计算当前需要显示的annotations. */
    NSArray *annotations = [self.coordinateQuadTree clusteredAnnotationsWithinMapRect:mapView.visibleMapRect
    /* 更新annotations. */
    [self updateMapViewAnnotationsWithAnnotations:annotations];
  • 更新annotations。对比mapView里已有的annotations,吐故纳新。
/* 更新annotation. */
- (void)updateMapViewAnnotationsWithAnnotations:(NSArray *)annotations
    /* 用户滑动时,保留仍然可用的标注,去除屏幕外标注,添加新增区域的标注 */
    NSMutableSet *before = [NSMutableSet setWithArray:self.mapView.annotations];
    [before removeObject:[self.mapView userLocation]];
    NSSet *after = [NSSet setWithArray:annotations];
    /* 保留仍然位于屏幕内的annotation. */
    NSMutableSet *toKeep = [NSMutableSet setWithSet:before];
    [toKeep intersectSet:after];
    /* 需要添加的annotation. */
    NSMutableSet *toAdd = [NSMutableSet setWithSet:after];
    [toAdd minusSet:toKeep];
    /* 删除位于屏幕外的annotation. */
    NSMutableSet *toRemove = [NSMutableSet setWithSet:before];
    [toRemove minusSet:after];
    /* 更新. */
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.mapView addAnnotations:[toAdd allObjects]];
        [self.mapView removeAnnotations:[toRemove allObjects]];
  • 实现MapView的delegate方法,根据anntation生成对应的View。annotationView的位置由其代表的poi平均位置决定,大小由poi数目决定。
-(MAAnnotationView *)mapView:(MAMapView *)mapView viewForAnnotation:(id<MAAnnotation>)annotation
    if ([annotation isKindOfClass:[ClusterAnnotation class]])
        /* dequeue重用annotationView代码. */
        /* ... */
        /* 设置annotationView的属性. */
        annotationView.annotation = annotation;
        annotationView.count = [(ClusterAnnotation *)annotation count];
        /* 设置annotationView的callout属性和calloutView代码. */
        /* ... */
        return annotationView;
    return nil;
  • 在mapView显示区域改变时,需要重算并更新annotations。
- (void)mapView:(MAMapView *)mapView regionDidChangeAnimated:(BOOL)animated
    /* mapView区域变化时重算annotation. */
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        [self addAnnotationsToMapView:self.mapView];


  • <UIViewController>
    • BaseMapViewController 地图基类
      • AnnotationClusterViewController poi点聚合
    • PoiDetailViewController 显示poi详细信息列表
  • MAAnnotationView
    • ClusterAnnotationView 自定义的聚合annotationView
  • Conform to <MAAnnotation>
    • ClusterAnnotation 记录annotation的信息,如其代表的poi数组、poi的个数、poi平均坐标,并提供两个annotation是否Equal的判断
  • CoordinateQuadTree 封装的四叉树类
  • QuadTree 四叉树基本算法




  • 手机扫描如下二维码直接安装


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提供iOS版本在地图上显示大量poi点的时候,进行点聚合的功能。 expand collapse


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