前言

需要实现员工巡查功能，展示地图，并显示员工当前所在位置。当该员工点击“开始巡查”按钮，则追随其脚步，进行轨迹绘制，直到员工点击“结束巡查”按钮，完成轨迹的绘制，并截图上传至后台。

注册和获取百度地图的秘钥

官方文档

引入第三方库

    pod 'BMKLocationKit'
    pod 'BaiduMapKit'

//引入base相关所有的头文件
#import <BaiduMapAPI_Base/BMKBaseComponent.h>
//引入地图功能所有的头文件
#import <BaiduMapAPI_Map/BMKMapComponent.h>

@interface RouteViewController ()<BMKMapViewDelegate, BMKLocationManagerDelegate>
@end

地图设置

#pragma mark - 地图懒加载
-(BMKMapView *)mapView
{
    if (!_mapView) {
        _mapView = [[BMKMapView alloc] initWithFrame:CGRectMake(0, kTopHeight, KScreenWidth, KScreenHeight-kTopHeight-100)];
        //地图放缩大小，4-21
        _mapView.zoomLevel = 17;
        //定位模式，定位跟随模式才会有个箭头跟着人走，罗盘的话会有一个圈圈
        _mapView.userTrackingMode = BMKUserTrackingModeFollow;
        //设定地图View能否支持所有手势操作
        _mapView.gesturesEnabled= YES;
        _mapView.delegate= self;
        //是否显示定位图层，默认为NO，则不显示跟着人走的箭头。
        _mapView.showsUserLocation = YES;
        //此类表示定位图层自定义样式参数
        BMKLocationViewDisplayParam *param = [[BMKLocationViewDisplayParam alloc] init];
        //不显示定位图层的圈圈
        param.isAccuracyCircleShow = NO;
        [_mapView updateLocationViewWithParam:param];
        //设置地图模式为标准地图
        [_mapView setMapType:BMKMapTypeStandard];
    }
    return _mapView;
}

定位设置

#pragma mark - 设置locationManager，定位到当前位置
-(void)setupLocationManager
{
    //初始化实例
    self.locationManager = [[BMKLocationManager alloc] init];
    self.locationManager.delegate = self;
    //设置返回位置的坐标系类型
    self.locationManager.coordinateType = BMKLocationCoordinateTypeBMK09LL;
    //设置距离过滤参数，超过10米才更新位置参数
    self.locationManager.distanceFilter = 10;
    //设置预期精度参数
    self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    //设置应用位置类型
    self.locationManager.activityType = CLActivityTypeAutomotiveNavigation;
    //设置是否自动停止位置更新
    self.locationManager.pausesLocationUpdatesAutomatically = NO;
    //设置是否允许后台定位
    self.locationManager.allowsBackgroundLocationUpdates = YES;
    //设置位置获取超时时间
    self.locationManager.locationTimeout = 10;
    //设置获取地址信息超时时间
    self.locationManager.reGeocodeTimeout = 10;
    [self.locationManager startUpdatingHeading];
    //打开这个才能在地图加载后定位到当前位置，不然坐标点箭头会跑到几内亚湾去
    [self.locationManager startUpdatingLocation];
}

定位代理

-(void)BMKLocationManager:(BMKLocationManager *)manager didUpdateHeading:(CLHeading *)heading
{
    if (!heading) {
        return;
    }
    if (!self.userLocation) {
        self.userLocation = [[BMKUserLocation alloc] init];
    }
    self.userLocation.heading = heading;
    [self.mapView updateLocationData:self.userLocation];
}

-(void)BMKLocationManager:(BMKLocationManager *)manager didUpdateLocation:(BMKLocation *)location orError:(NSError *)error
{
    if (error) {
        NSLog(@"locError:{%ld - %@};", (long)error.code, error.localizedDescription);
    }
    if (!location) {
        return ;
    }
    if (!self.userLocation) {
        self.userLocation = [[BMKUserLocation alloc] init];
    }
    
    self.userLocation.location = location.location;
    [self.mapView updateLocationData:self.userLocation];

    //设置一个开始绘制轨迹的flag，当flag为真的时候，开始绘制轨迹，在此处写代码来绘制
}

地图代理

#pragma mark - 添加线图
-(BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id<BMKOverlay>)overlay
{
    if ([overlay isKindOfClass:[BMKPolyline class]]) {
        BMKPolylineView *polylineView = [[BMKPolylineView alloc] initWithOverlay:overlay];
        polylineView.strokeColor = CSecondaryColor;
        polylineView.lineWidth = 2.0;
        
        return polylineView;
    }
    return nil;
}

#pragma mark - 添加完线图
-(void)mapView:(BMKMapView *)mapView didAddOverlayViews:(NSArray *)overlayViews
{
    //每次添加完线图，把地图的中心设置成起始点和当前位置点的中点
    CLLocationDegrees longitude = (self.startLocation.location.coordinate.longitude + self.userLocation.location.coordinate.longitude)/2;
    CLLocationDegrees latitude = (self.startLocation.location.coordinate.latitude + self.userLocation.location.coordinate.latitude)/2;
    _mapView.centerCoordinate = CLLocationCoordinate2DMake(latitude, longitude);
}

自定义Annotation

-(BMKAnnotationView *)mapView:(BMKMapView *)mapView viewForAnnotation:(id<BMKAnnotation>)annotation
{
    if ([annotation isKindOfClass:[BMKPointAnnotation class]]) {
        static NSString *reuseID = @"anotationReuseIndetifier";
        BMKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:reuseID];
        if (annotationView == nil) {
            annotationView = [[BMKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseID];
        }
        
        UILabel *lblStart = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
        if (!self.isStartTrace) {
            lblStart.text = @"始";
        }
        else{
            lblStart.text = @"终";
        }
        lblStart.backgroundColor = CSecondaryColor;
        lblStart.font = [UIFont systemFontOfSize:14.0];
        lblStart.textAlignment = NSTextAlignmentCenter;
        lblStart.textColor = [UIColor whiteColor];
        lblStart.layer.cornerRadius = 15;
        lblStart.layer.borderWidth = 1;
        lblStart.layer.masksToBounds = YES;
        lblStart.layer.borderColor = [UIColor darkGrayColor].CGColor;
        [annotationView addSubview:lblStart];
        
        return annotationView;
    }
    return nil;
}