需求：根据城市名获取对应城市下区的经纬度信息，然后根据对应区具体的经纬度插入大头针视图。
好比如：当前是上海，那么我就需要，黄浦区，宝山区等区的经纬度信息。功能的实现非常简单，高德已经提供了相应的代码如下：当然，也可以看官方开发平台这里：/api/ios-sdk/guide/searchkit/#t6
#import <AMapSearchKit/AMapSearchKit.h>@interfaceViewController ()<AMapSearchDelegate>{AMapSearchAPI *_search;}@end-(void)viewDidLoad{//初始化检索对象_search = [[AMapSearchAPI alloc] init];_search.delegate = self;//构造AMapDistrictSearchRequest对象，keywords为必选项AMapDistrictSearchRequest *districtRequest = [[AMapDistrictSearchRequest alloc] init];districtRequest.keywords = @"北京市直辖市";districtRequest.requireExtension = YES;//发起行政区划查询[_search AMapDistrictSearch:districtRequest];}//实现行政区划查询的回调函数- (void)onDistrictSearchDone:(AMapDistrictSearchRequest *)request response:(AMapDistrictSearchResponse *)response{NSLog(@"response: %@", response);[self handleDistrictResponse:response];}- (void)handleDistrictResponse:(AMapDistrictSearchResponse *)response{if (response == nil){return;}//通过AMapDistrictSearchResponse对象处理搜索结果for (AMapDistrict *dist in response.districts){MAPointAnnotation *poiAnnotation = [[MAPointAnnotation alloc] init];poiAnnotation.coordinate = CLLocationCoordinate2DMake(dist.center.latitude, dist.center.longitude);poiAnnotation.title= dist.name;poiAnnotation.subtitle = dist.adcode;[_mapView addAnnotation:poiAnnotation];if (dist.polylines.count > 0){MAMapRect bounds = MAMapRectZero;for (NSString *polylineStr in dist.polylines){MAPolyline *polyline = [CommonUtility polylineForCoordinateString:polylineStr];[_mapView addOverlay:polyline];bounds = MAMapRectUnion(bounds, polyline.boundingMapRect);}[_mapView setVisibleMapRect:bounds animated:YES];}}}
功能效果图：
但是有几个地方需要注意：
1：在开发平台注册应用时的安全码Bundle ID要与自己应用的Bundle ID一致，否则会出现错误。 2：API Key,在使用搜索服务之前需要先绑定key，[AMapSearchServicessharedServices].apiKey=GaoDeKey; 3：search对象使用全局变量 4：对于输入的城市名要进行分类，否则对于有些城市得不到返回数据的，有些城市返回2个数据，正确情况下是返回一个数据。这一点，我在开发平台没有找到相关内容，如果大家知道，可以告诉我，通过测试得到如下情形：分为直辖市，自治州，以及市3种情况。
具体实现代码如下：传入对应的城市名得到对应城市下区的信息
-(void)getCityAreaCoordinateWithCityName:(NSString *)cityName {//绑定注册应用的key[AMapSearchServices sharedServices].apiKey = GaoDeKey;_search = [[AMapSearchAPI alloc]init];_search.delegate = self;/*进行分类操作1）市辖区：对应上海市市辖区，北京市市辖区，天津市市辖区等2）自治州：大理白族自治州，黔南布依族苗族自治州等3）直接是市：广州市，深圳市，苏州市，杭州市，武汉市，西安市，成都市，乌鲁木齐市等*/AMapDistrictSearchRequest *dis = [[AMapDistrictSearchRequestalloc]init];if([cityName isEqualToString:@"上海"]||[cityName isEqualToString:@"北京"]||[cityName isEqualToString:@"天津"]){dis.keywords = [NSStringstringWithFormat:@"%@市市辖区",cityName];}elseif([cityName containsString:@"自治州"]){dis.keywords = cityName;}else{dis.keywords = [NSStringstringWithFormat:@"%@市",cityName];}//开始请求获取数据[_searchAMapDistrictSearch:dis];}/*** 行政区域查询回调函数* @param request 发起的请求，具体字段参考 AMapDistrictSearchRequest 。* @param response 响应结果，具体字段参考 AMapDistrictSearchResponse 。*/-(void)onDistrictSearchDone:(AMapDistrictSearchRequest *)request response:(AMapDistrictSearchResponse *)response{}/*** 当请求发生错误时，会调用代理的此方法.* @param request 发生错误的请求.* @param error 返回的错误.*/- (void)AMapSearchRequest:(id)request didFailWithError:(NSError *)error{}
返回的数据类型为AMapDistrictSearchResponse，该类拥有一个数组districts，数组中的每一个对象都是AMapDistrict类，AMapDistrict类中包含了我们需要的信息，center城市中心点，name城市名字等，下面是相关类的信息：
@interface AMapDistrictSearchResponse : AMapSearchObject@property (nonatomic, assign) NSInteger count; //!< 返回数目@property (nonatomic, strong) NSArray *districts; //!< 行政区域 AMapDistrict 数组@end#pragma mark - 行政区划@interface AMapDistrict : AMapSearchObject@property (nonatomic, copy) NSString *adcode; //!< 区域编码@property (nonatomic, copy) NSString *citycode; //!< 城市编码@property (nonatomic, copy) NSString *name; //!< 行政区名称@property (nonatomic, copy) NSString *level; //!< 级别@property (nonatomic, strong) NSArray *districts; //!< 下级行政区域数组@property (nonatomic, copy) AMapGeoPoint *center; //!< 城市中心点@property (nonatomic, strong) NSArray *polylines; //!< 行政区边界坐标点, NSString 数组@end#pragma mark - 通用数据结构// 经纬度@interface AMapGeoPoint : AMapSearchObject<NSCopying>@property (nonatomic, assign) CGFloat latitude;@property (nonatomic, assign) CGFloat longitude;+ (AMapGeoPoint *)locationWithLatitude:(CGFloat)lat longitude:(CGFloat)lon;@end
