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问题：气泡上显示乘客的头像，怎样获取到每个大头针对应哪个头像
解决：可以继承MAPointAnnotation， 类似下面代码
@interface YourPointAnnotation ： MAPointAnnotation
@property UIImageView* yourImageView;
@end
调用addAnnotation:时添加的类型改为YourPointAnnotation

上代码：

pragma mark - 打点（附近的乘客和司机）

• (void)addPersonAnnotation{
  NSArray *personArr = self.personsLocationDict[@"persons"];
  NSInteger count = personArr.count;
  for (NSInteger i=0; i<count; i++) {
  NSDictionary *personDict = personArr[i];
  NSArray *locationArr = personDict[@"gaodeLocation"];
  QCXPointAnnotation *pointAnnotation = [[QCXPointAnnotation alloc] init];
  pointAnnotation.coordinate = CLLocationCoordinate2DMake([locationArr[1] floatValue], [locationArr[0] floatValue]);
  pointAnnotation.title = personDict[@"name"];
  pointAnnotation.subtitle = personDict[@"nickName"];

    UIImageView *headerImgView = [[UIImageView alloc] init];
    headerImgView.frame =CGRectMake(0, 0, 50, 50);
    [headerImgView sd_setImageWithURL:personDict[@"picture"] placeholderImage:[UIImage imageNamed:@"car"]];
    pointAnnotation.headImageView = headerImgView;
    [self.annotationsArr addObject:pointAnnotation];
  

  }

  [self.mapView addAnnotations:self.annotationsArr];
  [self.mapView showAnnotations:self.annotationsArr animated:YES];
  }

代理方法：

• (MAAnnotationView *)mapView:(MAMapView *)mapView viewForAnnotation:(id <MAAnnotation>)annotation
  {

  if ([annotation isKindOfClass:[MAPointAnnotation class]])
  {
  static NSString *reuseIndetifier = @"annotationReuseIndetifier";
  MAAnnotationView *annotationView = (MAAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:reuseIndetifier];
  if (annotationView == nil)
  {
  annotationView = [[MAPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseIndetifier];
  }

    annotationView.canShowCallout               = YES;
    annotationView.draggable                    = YES;
    annotationView.image = [UIImage imageNamed:@"car"];
    
    QCXPointAnnotation *qcxAnn = annotation;
    annotationView.leftCalloutAccessoryView = qcxAnn.headImageView;
    return annotationView;
  

  }
  return nil;
  }

结束