提交：标注字段意义；

ios/Classes/AMapViewController.m

@@ -288,7 +288,7 @@
             request.keywords = queryString;
             request.page = 1;
             request.offset = 20;
-            request.requireExtension = YES;
+            request.requireExtension = YES;//是否返回扩展信息
             [weakSelf.search AMapPOIKeywordsSearch:request];
         } else {
             NSLog(@"POI 周边搜索：lat=%f, lon=%f", lat, lon);