最近项目中有需求需要使用定位，上报经纬度和地址信息，还有可以在地图界面随意选择地点，因为和后台经纬度匹配的问题，所以选择了高德地图(百度地图经纬度是有自己算法的)。

1.定位

iOS定位SDK提供后台持续定位的能力，可持久记录位置信息，适用于记轨迹录。

在调用定位功能的类中引入

AMapFoundationKit.h

AMapLocationKit.h

这两个头文件

在调用定位时，需要添加Key，需要注意的是请在 SDK 任何类的初始化以及方法调用之前设置正确的 Key。

将info.plist的字段改成

NSLocationAlwaysUsageDescription

字段。

⚠️ ⚠️ 在iOS 11 中，新出现了一个

NSLocationAlwaysAndWhenInUseUsageDeion

字段，如果以前设置的NSLocationAlwaysUsageDescription字段无用，请查看 《iOS11 Xcode9 更新适配》 传送门

如果需要后台持续定位需要开启 TARGETS->Capabilities->Background Modes

image.png

开启定位

self.locationManager = [[AMapLocationManager alloc] init];

[self.locationManager setDelegate:self];

//iOS 9(不包含iOS 9) 之前设置允许后台定位参数，保持不会被系统挂起

[self.locationManager setPausesLocationUpdatesAutomatically:NO];

[self.locationManager setAllowsBackgroundLocationUpdates:YES];

// iOS 9(包含iOS 9)之后新特性：将允许出现这种场景，同一app中多个locationmanager：一些只能在前台定位，另一些可在后台定位，并可随时禁止其后台定位。

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 9) {

self.locationManager.allowsBackgroundLocationUpdates = NO;

}

// 后台定位是否返回逆地理信息

[self.locationManager setLocatingWithReGeocode:YES];

// 开始持续定位

[self.locationManager startUpdatingLocation];

回调函数，处理经纬度及地址信息

- (void)amapLocationManager:(AMapLocationManager *)manager didUpdateLocation:(CLLocation *)location reGeocode:(AMapLocationReGeocode *)reGeocode {

NSLog(@"location:{lat:%f; lon:%f; accuracy:%f}", location.coordinate.latitude, location.coordinate.longitude, location.horizontalAccuracy);

if (regeocode) {

NSLog(@"reGeocode:%@", regeocode);

}

}

进行持续定位的时候，有些经纬度会漂移，比如室内等信号不好的地方，可以根据需求用以下的方法做一些简单的处理

// 小于70 认为GPS信号弱

NSString *horizontal = [NSString stringWithFormat:@"GPS信号为%lf",location.horizontalAccuracy];

// 速度为0 过滤掉

if (location.speed <= 0) {

self.currLocation = nil;

NSLog(@"速度为0");

return;

}

// 计算距离

MAMapPoint point1 = MAMapPointForCoordinate(CLLocationCoordinate2DMake(self.currLocation.coordinate.latitude,self.currLocation.coordinate.longitude));

MAMapPoint point2 = MAMapPointForCoordinate(CLLocationCoordinate2DMake(location.coordinate.latitude,location.coordinate.longitude));

CLLocationDistance distance = MAMetersBetweenMapPoints(point1,point2);

if (distance > 100) {

self.currLocation = nil;

NSLog(@"距离相差过大%f",distance);

return;

}

// 判断当前经纬度与上一个经纬度是否相同，相同则过滤掉

if (self.currLocation == location) {

self.currLocation = nil;

NSLog(@"相同经纬度");

return;

}

2.地图

初始化地图

//地图需要v4.5.0及以上版本才必须要打开此选项(v4.5.0以下版本，需要手动配置info.plist)

[AMapServices sharedServices].enableHTTPS = YES;

///初始化地图

_mapView = [[MAMapView alloc] initWithFrame:self.view.bounds];

_mapView.delegate = self;

[_mapView setZoomLevel:17.5 animated:YES];

[self.view addSubview:_mapView];

// 初始化地理编码

_search = [[AMapSearchAPI alloc] init];

_search.delegate = self;

点击地图上任一点显示信息，并添加标注

#pragma mark 点击地图方法

- (void)mapView:(MAMapView *)mapView didSingleTappedAtCoordinate:(CLLocationCoordinate2D)coordinate {

if (!self.isCheck) {

_mapView.showsUserLocation = NO;

_mapView.userTrackingMode = MAUserTrackingModeNone;

// 点击位置的经纬度

_touchMapCoordinate = coordinate;

// 如果有上一个标注，先删除

NSInteger annotationsNum = _mapView.annotations.count;

if (annotationsNum > 0) {

for (int i = 0; i < annotationsNum; i ++) {

NSLog(@"%@",_mapView.annotations);

if (i < _mapView.annotations.count) {

id item = [_mapView.annotations objectAtIndex:i];

[_mapView removeAnnotation:item];

}

}

}

// 逆地理编码获取地址

[self reocodeSearch];

} else {

// 逆地理编码获取地址

[self reocodeSearch];

}

}

#pragma mark 逆地理编码

- (void)reocodeSearch {

AMapReGeocodeSearchRequest *regeo = [[AMapReGeocodeSearchRequest alloc] init];

regeo.location = [AMapGeoPoint locationWithLatitude:_touchMapCoordinate.latitude longitude:_touchMapCoordinate.longitude];

regeo.requireExtension = YES;

[_search AMapReGoecodeSearch:regeo];

}

#pragma mark 标注delegate方法

- (MAAnnotationView *)mapView:(MAMapView *)mapView viewForAnnotation:(id )annotation

{

if ([annotation isKindOfClass:[MAUserLocation class]]) {

return nil;

}

if ([annotation isKindOfClass:[MAPointAnnotation class]])

{

static NSString *pointReuseIndentifier = @"pointReuseIndentifier";

CustomAnnotationView *annotationView = (CustomAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:pointReuseIndentifier];

if (annotationView == nil)

{

annotationView = [[CustomAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:pointReuseIndentifier];

}

if (!self.isCheck) {

annotationView.canShowCallout= YES; //设置气泡可以弹出，默认为NO

annotationView.animatesDrop = YES; //设置标注动画显示，默认为NO

annotationView.pinColor = MAPinAnnotationColorPurple;

annotationView.canShowCallout = NO;

annotationView.enabled = NO;

} else {

annotationView.canShowCallout= NO; //设置气泡可以弹出，默认为NO

annotationView.animatesDrop = NO; //设置标注动画显示，默认为NO

annotationView.pinColor = MAPinAnnotationColorPurple;

annotationView.canShowCallout = NO;

annotationView.enabled = NO;

}

return annotationView;

}

return nil;

}

#pragma mark 逆地理编码成功

- (void)onReGeocodeSearchDone:(AMapReGeocodeSearchRequest *)request response:(AMapReGeocodeSearchResponse *)response

{

if (response.regeocode != nil)

{

AMapReGeocode *regeocode = response.regeocode;

// 解析response获取地址描述，具体解析见 Demo

// regeocode.formattedAddress 格式化标准地址

[self addAnnotationWithAddress:regeocode.formattedAddress];

}

}

#pragma mark 逆地理编码失败

- (void)AMapSearchRequest:(id)request didFailWithError:(NSError *)error

{

NSLog(@"Error: %@", error);

}

#pragma mark 添加标注并设置地址内容

- (void)addAnnotationWithAddress:(NSString *)address {

MAPointAnnotation *pointAnnotation = [[MAPointAnnotation alloc] init];

pointAnnotation.coordinate = _touchMapCoordinate;

pointAnnotation.title = address;

_touchMapAddress = address;

[_mapView addAnnotation:pointAnnotation];

[_mapView selectAnnotation:pointAnnotation animated:YES];

}

Demo 传送门

自己学习的时候写的，欢迎大家提出建议和意见