首先需要遵守AGSMapView的AGSGeoViewTouchDelegate协议，实现其代理方法，在点击地图某一个点时会获得回调，在回调的位置需要进行检索查询，在PC端就是所谓的i查询：
- (void)geoView:(AGSGeoView *)geoView didTapAtScreenPoint:(CGPoint)screenPoint mapPoint:(AGSPoint *)mapPoint {
//进行i查询，tolerance大致是指精确的范围，api有英文解释
__weak __typeof(self)weakSelf = self;
[geoView identifyLayersAtScreenPoint:screenPoint tolerance:2.0 returnPopupsOnly:NO completion:^(NSArray<AGSIdentifyLayerResult *> * _Nullable identifyResults, NSError * _Nullable error) {
if (identifyResults.count) {
//得到的i查询结果一般是最大层的图层信息，这里得到的是动态图层信息
AGSIdentifyLayerResult *result = identifyResults.firstObject;
if (result.sublayerResults.count) {
//当然，咱们要的是图层上的元素信息，此处取第一个来高亮
AGSIdentifyLayerResult *oneLayer = result.sublayerResults.firstObject;
id<AGSGeoElement> geo = oneLayer.geoElements.firstObject;
if (geo.geometry.geometryType == AGSGeometryTypePolyline || geo.geometry.geometryType == AGSGeometryTypePolygon) {
//这里用空心实线来高亮用户点击的元素，具体用什么符号渲染，自行根据点击的元素类型枚举选择
AGSSimpleFillSymbol *fillSymble = [AGSSimpleFillSymbol simpleFillSymbolWithStyle:AGSSimpleFillSymbolStyleSolid color:[UIColor clearColor] outline:[AGSSimpleLineSymbol simpleLineSymbolWithStyle:AGSSimpleLineSymbolStyleSolid color:[UIColor redColor] width:2.0]];
//创建并将符号渲染到overlayer
AGSGraphic *myGraphic = [AGSGraphic graphicWithGeometry:geo.geometry symbol:fillSymble attributes:geo.attributes];
[weakSelf.overlayer.graphics removeAllObjects];
[weakSelf.overlayer.graphics addObject:myGraphic];
//移动到用户点击的点，自行选择是否需要，自带动画
[weakSelf.mapView setViewpointCenter:mapPoint completion:^(BOOL finished) {
//结束回调
}];
}
}
}else{
//父图层没有子图层时
id<AGSGeoElement> geo = result.geoElements.firstObject;
[weakSelf.mapView setViewpointGeometry:geo.geometry padding:1.0 completion:^(BOOL finished) {
}];
}
}];
}
元素的类型或者说形状类型为一个枚举：
typedef NS_ENUM(NSInteger, AGSGeometryType) {
AGSGeometryTypeUnknown = -1, /*!< Undefined未定义 */
AGSGeometryTypePoint = 1, /*!< Point点 */
AGSGeometryTypeEnvelope = 2, /*!< Envelope包络线 */
AGSGeometryTypePolyline = 3, /*!< Polyline 线*/
AGSGeometryTypePolygon = 4, /*!< Polygon 多边形*/
AGSGeometryTypeMultipoint = 5, /*!< Multipoint 多个点*/
};i查询的速度与服务器的性能，网络的情况也有莫大关系，所以有时候还是有点慢的。