高德地图的搜索功能的实现

我这里项目的需要是，使用高德地图，
要把地图上距离我当前位置这个大头针显示的位置的2公里之内的住宿，酒店，餐饮的信息，
全部检索到并显示在地图上，
我这里在项目里面要显示结果的地方添加的代码如下，

//初始化检索对象
_searchMapView = [[AMapSearchAPI alloc] initWithSearchKey:@"549f6a2bfd98c54aaf000c6f" Delegate:self];
if ([kCurentLanguage isEqualToString:@"en"]) {
_searchMapView.language = AMapSearchLanguage_en;
}
else if ([kCurentLanguage isEqualToString:@"zh-Hans"]) {
_searchMapView.language = AMapSearchLanguage_zh_CN;
}
//构造AMapPlaceSearchRequest对象，配置关键字搜索参数
AMapPlaceSearchRequest *poiRequest = [[AMapPlaceSearchRequest alloc] init];
poiRequest.searchType = AMapSearchType_PlaceKeyword;
poiRequest.keywords = @"俏江南";
poiRequest.city = @[@"beijing"];
poiRequest.requireExtension = YES;

//发起POI搜索
[_searchMapView AMapPlaceSearch: poiRequest];

相应的搜索的代理的回调代码如下，可是怎么就是没有搜索结果显示呢？

//实现POI搜索对应的回调函数

• (void)onPlaceSearchDone:(AMapPlaceSearchRequest *)request response:(AMapPlaceSearchResponse *)response
  {
  if(response.pois.count == 0)
  {
  return;
  }

  //通过AMapPlaceSearchResponse对象处理搜索结果
  NSString *strCount = [NSString stringWithFormat:@"count: %ld",response.count];
  NSString *strSuggestion = [NSString stringWithFormat:@"Suggestion: %@", response.suggestion];
  NSString *strPoi = @"";
  for (AMapPOI *p in response.pois) {
  strPoi = [NSString stringWithFormat:@"%@\nPOI: %@", strPoi, p.description];
  }
  NSString *result = [NSString stringWithFormat:@"%@ \n %@ \n %@", strCount, strSuggestion, strPoi];
  NSLog(@"Place: %@", result);
  }