1 新建一个类 声明 代理
2 实现 在 想要 定位的 c 中 来实现 用到 协议 建立 类的 属性

import <Foundation/Foundation.h>

@protocol JFLocationDelegate <NSObject>

/// 定位中

• (void)locating;

/**
当前位置

@param locationDictionary 位置信息字典
*/

• (void)currentLocation:(NSDictionary *)locationDictionary;

/**
拒绝定位后回调的代理

@param message 提示信息
*/

• (void)refuseToUsePositioningSystem:(NSString *)message;

/**
定位失败回调的代理

@param message 提示信息
*/

• (void)locateFailure:(NSString *)message;

@end

@interface JFLocation : NSObject

@property (nonatomic, strong) id<JFLocationDelegate> delegate;
@end

2 实现 定位

import "JFLocation.h"

import <CoreLocation/CoreLocation.h>

@interface JFLocation ()<CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager *locationManager;
@end

@implementation JFLocation

• (instancetype)init {
  if (self = [super init]) {
  [self startPositioningSystem];
  }
  return self;
  }

• (void)startPositioningSystem {
  self.locationManager = [[CLLocationManager alloc] init];
  self.locationManager.delegate = self;
  if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
  [self.locationManager requestWhenInUseAuthorization];
  }
  self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
  self.locationManager.distanceFilter = kCLDistanceFilterNone;
  [self.locationManager startUpdatingLocation];
  }

pragma mark CLLocationManagerDelegate

• (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(nonnull NSArray<CLLocation *> *)locations {
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
  if (self.delegate && [self.delegate respondsToSelector:@selector(locating)]) {
  [self.delegate locating];
  }
  });
  CLGeocoder * geoCoder = [[CLGeocoder alloc] init];
  [geoCoder reverseGeocodeLocation:[locations lastObject] completionHandler:^(NSArray *placemarks, NSError *error) {
  for (CLPlacemark * placemark in placemarks) {
  NSDictionary *location = [placemark addressDictionary];
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
  if (self.delegate && [self.delegate respondsToSelector:@selector(currentLocation:)]) {
  [self.delegate currentLocation:location];
  }
  });
  }
  }];
  [manager stopUpdatingLocation];
  }

• (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
  if ([error code] == kCLErrorDenied) {
  if (self.delegate && [self.delegate respondsToSelector:@selector(refuseToUsePositioningSystem:)]) {
  [self.delegate refuseToUsePositioningSystem:@"已拒绝使用定位系统"];
  }
  }
  if ([error code] == kCLErrorLocationUnknown) {
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
  if (self.delegate && [self.delegate respondsToSelector:@selector(locateFailure:)]) {
  [self.delegate locateFailure:@"无法获取位置信息"];
  }
  });
  }
  }

@end

c 中 要实现的 对应的 协议方法

pragma mark --- JFLocationDelegate 开机定位

//定位中...

• (void)locating {
  NSLog(@"定位中...");
  }

//定位成功

• (void)currentLocation:(NSDictionary *)locationDictionary {
  NSString *city = [locationDictionary valueForKey:@"City"];

if (![_leftButton.titleLabel.text isEqualToString:city]) {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:[NSString stringWithFormat:@"您定位到%@，确定切换城市吗？",city] preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [_leftButton setTitle:city forState:UIControlStateNormal];
        [KCURRENTCITYINFODEFAULTS setObject:city forKey:@"locationCity"];
        [KCURRENTCITYINFODEFAULTS setObject:city forKey:@"currentCity"];
        [self.manager cityNumberWithCity:city cityNumber:^(NSString *cityNumber) {
            [KCURRENTCITYINFODEFAULTS setObject:cityNumber forKey:@"cityNumber"];
        }];
    }];
    [alertController addAction:cancelAction];
    [alertController addAction:okAction];
    [self presentViewController:alertController animated:YES completion:nil];
}

}

/// 拒绝定位

• (void)refuseToUsePositioningSystem:(NSString *)message {
  NSLog(@"%@",message);
  JFLog(@"%@", message);
  }

/// 定位失败

• (void)locateFailure:(NSString *)message {
  NSLog(@"%@",message);
  }