写在前面：
项目需求用到这个功能，主要目的是实现老师设置位置签到范围，学生在一定范围内进行签到的功能。
功能如下方截图：
屏幕快照 2019-01-28 上午10.29.26.png
简要介绍：
下面记录一下主要的实现流程，功能的实现主要是根据百度地图开发者官网提供的api文档，各项功能之间组合。百度地图的SDK现在分成了地图功能和定位功能两块不同的SDK，BaiduMapAPI这个是基础的地图功能，BMKLocationKit这个是定位功能。项目里实现定位签到功能用的的SDK包括上面说的这两个模块，所以在用cocopods引入framework的时候，需要引入： #百度地图 pod 'BMKLocationKit' pod 'BaiduMapKit'
功能实现
一、在APPdelegate.m文件中引入：
#import <BaiduMapAPI_Base/BMKBaseComponent.h>
#import <BMKLocationKit/BMKLocationComponent.h>加入功能代码：
#pragma mark 百度地图设置
- (void)configBaiduMap {
NSString *ak = @"xxxx";
BMKMapManager *mapManager = [[BMKMapManager alloc] init];
self.mapManager = mapManager;
BOOL ret = [mapManager start:ak generalDelegate:nil];
[[BMKLocationAuth sharedInstance] checkPermisionWithKey:ak authDelegate:self];
if (!ret) {
NSLog(@"manager start failed!");
}
}二、在用到地图定位功能的viewController中
#import <BMKLocationKit/BMKLocationComponent.h>
#import <BaiduMapAPI_Base/BMKBaseComponent.h>//引入base相关所有的头文件
#import <BaiduMapAPI_Map/BMKMapComponent.h>//引入地图功能所有的头文件遵循协议<BMKMapViewDelegate,BMKLocationManagerDelegate>
声明全局变量
@property (nonatomic, strong) BMKUserLocation *userLocation; //当前位置对象
@property (nonatomic, strong) BMKLocationManager *locationManager;
@property (nonatomic, strong) BMKMapView *mapView;
//@property (nonatomic, strong) BMKPointAnnotation* annotation ;
@property (nonatomic, strong) NSMutableArray *annotationArr;
@property (nonatomic, strong) NSMutableArray *circleArr;地图SDK文档中建议在以下代码中如此设置， 目的是控制内存
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[_mapView viewWillAppear];
_mapView.delegate = self;
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[_mapView viewWillDisappear];
_mapView.delegate = nil;
}
- (void)dealloc {
if (_mapView) {
_mapView = nil;
}
}初始化数组，这两个数组在接下来会用到
- (NSMutableArray *)annotationArr {
if (!_annotationArr) {
_annotationArr = [NSMutableArray array];
}
return _annotationArr;
}
- (NSMutableArray *)circleArr {
if (!_circleArr) {
_circleArr = [NSMutableArray array];
}
return _circleArr;
}添加地图view
#pragma mark 添加地图
- (void)addSignMapBgView {
if (!self.mapBgView) {
UIView *mapBgView = [UIView new];
self.mapBgView = mapBgView;
mapBgView.backgroundColor = [CommUtls colorWithHexString:APP_BgColor];
[self addSubview:mapBgView];
[mapBgView makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.tipView.bottom);
make.left.right.bottom.equalTo(0);
}];
_mapView = [[BMKMapView alloc] initWithFrame:CGRectZero];
// _mapView.delegate = self;
[_mapView setZoomLevel:21];//精确到5米
_mapView.showsUserLocation = YES;//显示定位图层
[mapBgView addSubview:_mapView];
[_mapView makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(0);
}];
_mapView.userTrackingMode = BMKUserTrackingModeNone;
}
}初始化地图定位：这里我用的是一次定位而没有选择持续定位。
#pragma mark 初始化locationManager
- (void)initUserLocationManager {
//因为mapView是在一个分离出来的view中创建的，所以在这里将signSetTypeView中的mapView赋给当前viewcontroller的mapView；
self.mapView = self.mainView.signSetTypeView.mapView;
self.mapView.delegate = self;
// self.annotation = [[BMKPointAnnotation alloc] init];
// self.mapView是BMKMapView对象
//精度圈设置
BMKLocationViewDisplayParam *param = [[BMKLocationViewDisplayParam alloc] init];
//设置显示精度圈，默认YES
param.isAccuracyCircleShow = YES;
//精度圈 边框颜色
param.accuracyCircleStrokeColor = [UIColor colorWithRed:242/255.0 green:129/255.0 blue:126/255.0 alpha:1];
//精度圈 填充颜色
param.accuracyCircleFillColor = [UIColor colorWithRed:242/255.0 green:129/255.0 blue:126/255.0 alpha:0.3];
[self.mapView updateLocationViewWithParam:param];
self.userLocation = [[BMKUserLocation alloc] init];
//初始化实例
_locationManager = [[BMKLocationManager alloc] init];
//设置delegate
_locationManager.delegate = self;
//设置返回位置的坐标系类型
_locationManager.coordinateType = BMKLocationCoordinateTypeBMK09LL;
//设置距离过滤参数
_locationManager.distanceFilter = kCLDistanceFilterNone;
//设置预期精度参数
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
//设置应用位置类型
_locationManager.activityType = CLActivityTypeAutomotiveNavigation;
//设置是否自动停止位置更新
_locationManager.pausesLocationUpdatesAutomatically = NO;
//设置是否允许后台定位
//_locationManager.allowsBackgroundLocationUpdates = YES;
//设置位置获取超时时间
_locationManager.locationTimeout = 15;
//设置获取地址信息超时时间
_locationManager.reGeocodeTimeout = 15;
//请求一次定位
[self requestLocation];
}请求定位，获取经纬度
#pragma mark 请求定位
- (void)requestLocation {
[_locationManager requestLocationWithReGeocode:YES withNetworkState:YES completionBlock:^(BMKLocation * _Nullable location, BMKLocationNetworkState state, NSError * _Nullable error) {
if (error)
{
NSLog(@"locError:{%ld - %@};", (long)error.code, error.localizedDescription);
}
if (location) {//得到定位信息，添加annotation
if (location.location) {
NSLog(@"LOC = %@",location.location);
}
if (location.rgcData) {
NSLog(@"rgc = %@",[location.rgcData description]);
}
if (!location) {
return;
}
if (!self.userLocation) {
self.userLocation = [[BMKUserLocation alloc] init];
}
self.userLocation.location = location.location;
[self.mapView updateLocationData:self.userLocation];
CLLocationCoordinate2D mycoordinate = location.location.coordinate;
self.mapView.centerCoordinate = mycoordinate;
//赋予初始值
self.viewModel.lat = [NSString stringWithFormat:@"%f", location.location.coordinate.latitude];
self.viewModel.lng = [NSString stringWithFormat:@"%f",location.location.coordinate.longitude];
self.viewModel.radius = @"50";
//打印经纬度
NSLog(@"didUpdateUserLocation lat %f,long %f",location.location.coordinate.latitude,location.location.coordinate.longitude);
}
NSLog(@"netstate = %d",state);
}];
}地图长按选点功能实现：
//长按地图选点
- (void)mapview:(BMKMapView *)mapView onLongClick:(CLLocationCoordinate2D)coordinate {
if (self.annotationArr.count > 0) {
[mapView removeAnnotations:self.annotationArr];
[self.annotationArr removeAllObjects];
BMKPointAnnotation *annotation = [[BMKPointAnnotation alloc]init];
annotation.coordinate = coordinate;
[self.annotationArr addObject:annotation];
[mapView addAnnotations:self.annotationArr];
} else {
BMKPointAnnotation *annotation = [[BMKPointAnnotation alloc]init];
annotation.coordinate = coordinate;
[self.annotationArr addObject:annotation];
[mapView addAnnotations:self.annotationArr];
}
//弹出半径选择框
[self showLocationSelectRadiusViewWithCoordinate:coordinate];
}选点后弹出选择定位范围弹框
#pragma mark 弹出位置弹框
- (void)showLocationSelectRadiusViewWithCoordinate:(CLLocationCoordinate2D)coordinate {
ExtraActLocationSignPopView *popView = [ExtraActLocationSignPopView new];
[popView show];
@weakify(self);
[popView.locatioonSureSignal subscribeNext:^(NSString *x) {
@strongify(self);
self.viewModel.radius = x;
CGFloat radius = [x floatValue];
[self circleWithCenterWithCoordinate2D:coordinate radius:radius];
}];
}设置好定位点以及半径范围后绘制范围圈，开始的时候声明的circleArr在这里用来盛放添加的区域圆形，在添加新的圆圈的时候，将之前旧的移除，保证每次绘制的范围都是最新的，同理annotationArr也是这个功能，因为API有提供的- (void)addOverlays:(NSArray *)overlays;这个方法：
#pragma mark 添加区域圆形覆盖
- (void)circleWithCenterWithCoordinate2D:(CLLocationCoordinate2D )coor radius:(CGFloat)radius {
NSLog(@"coordinate lat %f,long %f",coor.latitude,coor.longitude);
//赋予点击选点值
self.viewModel.lat = [NSString stringWithFormat:@"%f", coor.latitude];
self.viewModel.lng = [NSString stringWithFormat:@"%f",coor.longitude];
if (self.circleArr.count > 0) {
[_mapView removeOverlays:self.circleArr];
[self.circleArr removeAllObjects];
BMKCircle *circle = [BMKCircle circleWithCenterCoordinate:coor radius:radius];
[self.circleArr addObject:circle];
[_mapView addOverlays:self.circleArr];
} else {
BMKCircle *circle = [BMKCircle circleWithCenterCoordinate:coor radius:radius];
[self.circleArr addObject:circle];
[_mapView addOverlays:self.circleArr];
}
}
#pragma mark 重绘overlay
- (BMKOverlayView *)mapView:(BMKMapView *)mapView viewForOverlay:(id <BMKOverlay>)overlay{
if ([overlay isKindOfClass:[BMKCircle class]]){
BMKCircleView* circleView = [[BMKCircleView alloc] initWithOverlay:overlay];
circleView.fillColor = [UIColor colorWithRed:33/255.0 green:196/255.0 blue:206/255.0 alpha:0.3];
circleView.strokeColor = [UIColor colorWithRed:33/255.0 green:196/255.0 blue:206/255.0 alpha:1];
circleView.lineWidth = 1.0;
return circleView;
}
return nil;
}至此，在地图上选点进行签到功能基本实现，另外，关于 自定义的范围圆圈的颜色，边框大小都是可以自定义的，选点的标记也是可以自定义的，官方文档有说明
总结
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