1.首先在plist文件中添加

<key>NSLocationWhenInUseUsageDescription</key><string>需要定位</string>    <key>NSLocationAlwaysUsageDescription</key><string>需要定位</string>

2.之后在Build Phases 中的Link Binary With Libraries 中添加 CoreLoaction.framework 

3.在需要調取的地方引入#import <CoreLocation/CoreLocation.h> 以及<CLLocationManagerDelegate>代理

下面是具體方法

#import "ViewController.h"#import <CoreLocation/CoreLocation.h>@interface ViewController ()<CLLocationManagerDelegate>{ CLLocationManager * locationManager; NSString * currentCity; //當前城市}@end@implementation ViewController- (void)locate {    //判斷定位功能是否打開    if ([CLLocationManager locationServicesEnabled]) {        locationManager = [[CLLocationManager alloc] init];        locationManager.delegate = self;        //        [locationManager requestAlwaysAuthorization];        currentCity = [[NSString alloc] init];        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0){                        [locationManager requestWhenInUseAuthorization];  //調用了這句,就會彈出允許框了.            }        [locationManager startUpdatingLocation];    }    }- (void)viewDidLoad {    [super viewDidLoad];       [self locate];        };//定位失敗則執行此代理方法//定位失敗彈出提示框,點擊"打開定位"按鈕,會打開系統的設置,提示打開定位服務- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {    UIAlertController * alertVC = [UIAlertController alertControllerWithTitle:@"允許/"定位/"提示" message:@"請在設置中打開定位" PReferredStyle:UIAlertControllerStyleAlert];    UIAlertAction * ok = [UIAlertAction actionWithTitle:@"打開定位" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {        //打開定位設置//        NSURL *settingsURL = [NSURL URLWithString:UIapplicationOpenSettingsURLString];//        [[UIApplication sharedApplication] openURL:settingsURL];    }];    UIAlertAction * cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {            }];    [alertVC addAction:cancel];    [alertVC addAction:ok];    [self presentViewController:alertVC animated:YES completion:nil];    }//定位成功- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {    [locationManager stopUpdatingLocation];    CLLocation *currentLocation = [locations lastObject];    CLGeocoder * geoCoder = [[CLGeocoder alloc] init];        //反編碼    [geoCoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {        if (placemarks.count > 0) {            CLPlacemark *placeMark = placemarks[0];            currentCity = placeMark.locality;            if (!currentCity) {                currentCity = @"無法定位當前城市";            }            NSLog(@"%@",currentCity); //這就是當前的城市            NSLog(@"%@",placeMark.name);//具體地址:  xx市xx區xx街道        }        else if (error == nil && placemarks.count == 0) {            NSLog(@"No location and error return");        }        else if (error) {            NSLog(@"location error: %@ ",error);        }            }];        }@end