iOS 获取用户当前的经纬度和地址位置信息

常见app需求：获取当前用户的经纬度或地址信息，或者通过经纬度计算与某个位置的距离

1.导入coreLocation库

2.在info.plist里设置权限

(以下二选一，两个都添加默认使用NSLocationWhenInUseUsageDescription）：NSLocationWhenInUseUsageDescription：允许在前台使用时获取GPS的描述NSLocationAlwaysUsageDescription：允许永久使用GPS的描述

3.导入头文件和设置代理

#import <CoreLocation/CoreLocation.h>

@interface ViewController () <CLLocationManagerDelegate>

/** 定位 */

@property (nonatomic, strong) CLLocationManager *locationManager;

@end

4.实现定位

//调用方法

- (void)viewDidLoad {
    [super viewDidLoad];
    [self startLocation];
}

//定位
- (void)startLocation {
    //判断定位是否允许
    if ([CLLocationManager locationServicesEnabled]) {
        self.locationManager = [[CLLocationManager alloc] init];
        self.locationManager.delegate = self;
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        self.locationManager.distanceFilter = 10.0f;
        [_locationManager requestWhenInUseAuthorization];
        [self.locationManager startUpdatingLocation];
    } else {
        //如果没有授权定位，提示开启
        UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"允许定位" message:@"请在设置中打开定位" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *ensure = [UIAlertAction actionWithTitle:@"打开定位" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
            [[UIApplication sharedApplication] openURL:url];
        }];
        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
        [alertVC addAction:ensure];
        [alertVC addAction:cancel];
        [self.navigationController presentViewController:alertVC animated:YES completion:nil];
    }
}

#pragma mark - CLLocationManagerDelegate
//更新用户位置
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
    YMLog(@"%@",locations);
    //当前所在城市的坐标值
    CLLocation *currLocation = [locations lastObject];
    YMLog(@"当前经度=%f 当前纬度=%f 当前高度=%f", currLocation.coordinate.latitude, currLocation.coordinate.longitude, currLocation.altitude);
    [AppSingleInstance sharedInstance].latitude = currLocation.coordinate.latitude;
    [AppSingleInstance sharedInstance].longitude = currLocation.coordinate.longitude;

    //根据经纬度反编译地址信息
    CLGeocoder *geoCoder = [[CLGeocoder alloc] init];
    [geoCoder reverseGeocodeLocation:currLocation completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {

        if (placemarks.count > 0) {
            CLPlacemark *placeMark = placemarks[0];
            YMLog(@"当前用户所在城市：%@",placeMark.locality);
            YMLog(@"%@",placeMark.country);//当前国家
            YMLog(@"%@",placeMark.locality);//当前城市
            YMLog(@"%@",placeMark.subLocality);//当前位置
            YMLog(@"%@",placeMark.thoroughfare)//当前街道
            YMLog(@"%@",placeMark.name);//具体地址  市  区  街道

            NSString *address = [NSString stringWithFormat:@"%@%@%@",placeMark.locality,placeMark.subLocality,placeMark.name];
            YMLog(@"%@",address);
            [AppSingleInstance sharedInstance].currentUserAddress = address;

        } else if (error == nil && placemarks.count == 0) {
            YMLog(@"没有地址返回");
        } else if (error) {
            YMLog(@"%@",error);
        }
    }];
}

//定位失败
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    if (error.code == kCLErrorDenied) {
        //访问被拒绝
        YMLog(@"位置访问被拒绝");
    } else if (error.code == kCLErrorLocationUnknown) {
        YMLog(@"无法获取用户信息");
    }
}