提交：修改处理逻辑；

ios/Classes/ClxMapPoiSearchPlugin.m

@@ -88,6 +88,7 @@
 - (void)keywordsSearch:(NSString *)keywords {
     AMapPOIKeywordsSearchRequest *request = [[AMapPOIKeywordsSearchRequest alloc] init];
     request.keywords = keywords;
+    request.cityLimit = YES;
     request.page = 1;
     request.offset = 20;
     //是否返回扩展信息
@@ -119,33 +120,20 @@
         request.offset = 20;
         request.radius = 1000;
         if (keywords != nil && [keywords isKindOfClass:[NSNull class]]) {
-            if (keywords.length != 0) {
-                request.keywords = keywords;
-            }
+            request.keywords = keywords;
         }
         if (city != nil && ![city isKindOfClass:[NSNull class]]) {
-            if (city.length != 0) {
-                request.city = city;
-            }
+            request.city = city;
         }
         [self.search AMapPOIAroundSearch:request];
     } else {
         NSLog(@"aroundSearchAll 经纬度为0 - latitude:%@, longitude:%@", latitude, longitude);
 
         AMapPOIKeywordsSearchRequest *request = [[AMapPOIKeywordsSearchRequest alloc] init];
-        if (keywords != nil && [keywords isKindOfClass:[NSNull class]]) {
-            if (keywords.length != 0) {
-                request.keywords = keywords;
-            }
-        }
-        if (city != nil && ![city isKindOfClass:[NSNull class]]) {
-            if (city.length != 0) {
-                request.city = city;
-            }
-        }
+        request.keywords = keywords;
+        request.cityLimit = YES;
         request.page = 1;
         request.offset = 20;
-        
         //是否返回扩展信息
         //request.requireExtension = YES;
         [self.search AMapPOIKeywordsSearch:request];