本工程为基于高德地图iOS SDK进行封装，实现了通过地图中心进行兴趣点选择的例子

前述

• 高德官网申请Key.
• 阅读开发指南.
• 工程基于iOS 3D地图SDK和搜索SDK实现

功能描述

基于3D地图SDK和搜索SDK进行封装，通过屏幕中心点经纬度进行逆地理编码搜索和POI搜索。

核心类/接口

类	接口	说明	版本
AMapSearchAPI	- (void)AMapReGoecodeSearch:(AMapReGeocodeSearchRequest *)request;	逆地址编码查询接口	v4.0.0
AMapSearchAPI	- (void)AMapPOIAroundSearch:(AMapPOIAroundSearchRequest *)request;	POI 周边查询接口	v4.0.0
PlaceAroundTableView	---	继承自UIView，实现了显示逆地理以及POI周边搜索结果，并响应事件。	---

核心难点

Objective-C

/* 定位回调中进行逆地理和周边poi查询. */
- (void)mapView:(MAMapView *)mapView didUpdateUserLocation:(MAUserLocation *)userLocation updatingLocation:(BOOL)updatingLocation
{
    if(!updatingLocation)
        return ;
    
    if (userLocation.location.horizontalAccuracy < 0)
    {
        return ;
    }

    // only the first locate used.
    if (!self.isLocated)
    {
        self.isLocated = YES;
        
        [self.mapView setCenterCoordinate:CLLocationCoordinate2DMake(userLocation.location.coordinate.latitude, userLocation.location.coordinate.longitude)];
        
        [self actionSearchAround];
        
        self.mapView.userTrackingMode = MAUserTrackingModeFollow;
    }
}

/* 地图移动回调 */
- (void)mapView:(MAMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    if (!self.isMapViewRegionChangedFromTableView && self.mapView.userTrackingMode == MAUserTrackingModeNone)
    {
        [self actionSearchAround];
    }
    self.isMapViewRegionChangedFromTableView = NO;
}

/* PlaceAroundTableView中实现搜索结果回调delegate */
- (void)onPOISearchDone:(AMapPOISearchBaseRequest *)request response:(AMapPOISearchResponse *)response
{
    if (self.isFromMoreButton == YES)
    {
        self.isFromMoreButton = NO;
    }
    else
    {
        [self.searchPoiArray removeAllObjects];
        [self.moreButton setTitle:@"更多.." forState:UIControlStateNormal];
        self.moreButton.enabled = YES;
        self.moreButton.backgroundColor = [UIColor whiteColor];
    }

    if (response.pois.count == 0)
    {
        NSLog(@"没有数据了");
        [self.moreButton setTitle:@"没有数据了.." forState:UIControlStateNormal];
        self.moreButton.enabled = NO;
        self.moreButton.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.4];
        
        self.selectedIndexPath = nil;
        [self.tableView reloadData];
        return;
    }
    
    [response.pois enumerateObjectsUsingBlock:^(AMapPOI *obj, NSUInteger idx, BOOL *stop) {
        [self.searchPoiArray addObject:obj];
    }];
    
    self.selectedIndexPath = nil;
    [self.tableView reloadData];
}

- (void)onReGeocodeSearchDone:(AMapReGeocodeSearchRequest *)request response:(AMapReGeocodeSearchResponse *)response
{
    if (response.regeocode != nil)
    {
        self.currentRedWaterPosition = response.regeocode.formattedAddress;
        
        NSIndexPath *reloadIndexPath = [NSIndexPath indexPathForRow:0 inSection:0];
        [self.tableView reloadRowsAtIndexPaths:@[reloadIndexPath] withRowAnimation:UITableViewRowAnimationNone];
    }
}

Swift

func mapView(_ mapView: MAMapView!, didUpdate userLocation: MAUserLocation!, updatingLocation: Bool) {
    if !updatingLocation {
        return
    }
    if userLocation.location.horizontalAccuracy < 0 {
        return
    }
    // only the first locate used.
    if !self.isLocated {
        self.isLocated = true
        self.mapView.userTrackingMode = .follow
        self.mapView.centerCoordinate = userLocation.location.coordinate
        self.actionSearchAround(at: userLocation.location.coordinate)
    }
}

func mapView(_ mapView: MAMapView!, regionDidChangeAnimated animated: Bool) {
    if !self.isMapViewRegionChangedFromTableView && self.mapView.userTrackingMode == .none {
        self.actionSearchAround(at: self.mapView.centerCoordinate)
    }
    self.isMapViewRegionChangedFromTableView = false
}

/* PlaceAroundTableView中实现搜索结果回调delegate */
func onPOISearchDone(_ request: AMapPOISearchBaseRequest!, response: AMapPOISearchResponse!) {
    
    if isFromMoreButton {
        isFromMoreButton = false
    }
    else {
        self.searchPoiArray.removeAll()
        self.moreButton.setTitle(kMoreButtonTitle, for: UIControlState.normal)
        self.moreButton.isEnabled = true
        self.moreButton.backgroundColor = UIColor.white
    }
    
    if response.count == 0 {
        self.moreButton.setTitle("没有数据了...", for: UIControlState.normal)
        self.moreButton.isEnabled = false
        self.moreButton.backgroundColor = UIColor.gray
        self.selectedIndexPath = nil
        
        self.tableView.reloadData()

        return
    }
    
    self.searchPoiArray.append(contentsOf: response.pois)
    self.selectedIndexPath = nil
    self.tableView.reloadData()
}

func onReGeocodeSearchDone(_ request: AMapReGeocodeSearchRequest!, response: AMapReGeocodeSearchResponse!) {
    
    if response.regeocode != nil {
        self.currentAddress = response.regeocode.formattedAddress;
        self.tableView.reloadRows(at: [IndexPath(row: 0, section: 0)], with: UITableViewRowAnimation.none)
    }
}