1. IOS定位服務的開啟與基本設置

1. 要想使用IOS中的定位服務首先需要包含頭文件CoreLocation/CoreLocation.h，在interface中聲明一個屬性locationManager

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface ViewController () <CLLocationManagerDelegate>

// 定位管理器
@property (strong, nonatomic) CLLocationManager * locationManager;

@end

2. 懶加載

@implementation ViewController

- (CLLocationManager *)locationManager {

    if (!_locationManager) {
        // 實例化管理器
        _locationManager = [[CLLocationManager alloc] init];
        // 設置管理器類型為普通
        _locationManager.activityType = CLActivityTypeOther;
        // 設置精度為最高
        _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        // 設置自動過濾值
        _locationManager.distanceFilter = 10;
        // 設置代理
        // 協議中的方法和定位結果有關
        _locationManager.delegate = self;
    }
    return _locationManager;
}

@end

2. 檢測應用程序的授權狀態

// 獲取定位服務授權狀態
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    
    // 判斷是否已經授權
    if (status == kCLAuthorizationStatusNotDetermined) {
        NSLog(@"未授權狀態");
        // 當使用應用程序時使用定位服務
        [self.locationManager requestWhenInUseAuthorization];
    } else if (status == kCLAuthorizationStatusDenied) {
        NSLog(@"授權被拒絕");
        // 創建一個模態警告視圖控制器
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"溫馨提示" message:@"親，你還沒有開啟定位服務，現在設置好嗎？" preferredStyle:UIAlertControllerStyleActionSheet];
        // 打開設置的按鈕
        UIAlertAction *openAction = [UIAlertAction actionWithTitle:@"打開設置" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            // 點擊設置按鈕的回調方法
            // 打開應用程序的設置
            NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
            // 通過UIApplication對象的openURL方法可以
            // 打電話 - tel://號碼
            // 發短信 - sms://號碼
            // 打開網頁 - http(s)://網址
            // 打開App Store - itms-apps://應用地址
            // NSURL *url2 = [NSURL URLWithString:@"tel://1008611"];
            // [[UIApplication sharedApplication] openURL:url2];]
            [[UIApplication sharedApplication] openURL:url];
        }];
        // 取消按鈕
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
        // 將兩個UIAlertAction(相當于兩顆按鈕)加到視圖控制器上
        [alertController addAction:openAction];
        [alertController addAction:cancelAction];
        // 以模態的方式顯示警告視圖控制器
        [self presentViewController:alertController animated:YES completion:nil];
    }

3. 開始定位

// 開始定位
[self.locationManager startUpdatingLocation];
// 通過協議方法獲取定位信息
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {

    // locations是獲取的位置信息集合
    NSLog(@"%@", locations.firstObject);
}

4. 范圍監測

#pragma mark - 監測區域
- (void) monitorRange {

    // 監測中心
    CLLocationCoordinate2D center = CLLocationCoordinate2DMake(30.000000, 104.000000);
    // 創建監測范圍對象
    // 參數1：監測中心
    // 參數2：監測半徑
    // 參數3：標識
    CLCircularRegion * region = [[CLCircularRegion alloc] initWithCenter:center radius:200 identifier:@"home"];
    // 開始檢測目標范圍
    [self.locationManager startMonitoringForRegion:region];
}

#pragma mark - CLLocationManagerDelegate
// 進入監測范圍
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {

    NSLog(@"你已進入監測區域");
}

// 離開監測范圍
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {

    NSLog(@"你已離開了監測區域");
}

5. 地理編碼和反編碼

#import "ZFGeocoder.h"
#import <CoreLocation/CoreLocation.h>

@implementation ZFGeocoder

// 通過類方法創建一個地理編碼管理器
+ (instancetype) createGeocoder {

    ZFGeocoder * geocoder = nil;
    if (!geocoder) {
        geocoder = [[ZFGeocoder alloc] init];
    }
    return geocoder;
}

// 將地址編碼編成對應的經緯度
+ (void)getCoordinateWithAddress:(NSString *)address didFinished:(void (^)(CLLocationCoordinate2D))coordinate {

    //將地址編碼成對應的經緯度
    [[self createGeocoder] geocodeAddressString:address completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        
        //返回值
        CLLocationCoordinate2D tcoordinate = CLLocationCoordinate2DMake(0, 0);
        
        for (CLPlacemark * mark in placemarks) {
            
            //拿到經緯度
            tcoordinate = mark.location.coordinate;
        }
        
        //調用block傳值
        coordinate(tcoordinate);
    }];
}

// 將經緯度進行反編碼
+ (void)getAddressWithCoordinate:(CLLocationCoordinate2D)coordinate didFinished:(void (^)(NSDictionary *))address {

    //拿到解析器
    CLGeocoder * geo = [self createGeocoder];
    
    //反編碼
    CLLocation * location = [[CLLocation alloc] initWithLatitude:coordinate.latitude longitude:coordinate.longitude];
    [geo reverseGeocodeLocation:location completionHandler:^(NSArray *  placemarks, NSError *  error) {
        
        NSDictionary * dict;
        
        //參數1:反編碼后的結果
        for (CLPlacemark * mark  in placemarks) {
            //拿到返回值
            dict = mark.addressDictionary;
            //            NSLog(@"%@", mark.addressDictionary);
            //            //獲取詳細信息
            //            NSLog(@"%@", mark.addressDictionary[@"FormattedAddressLines"][0]);
            //            //國家
            //            NSLog(@"國家:%@",mark.addressDictionary[@"Country"]);
            //
            //            //街道:
            //            NSLog(@"街道:%@", mark.addressDictionary[@"Street"]);
        }

        //調用block傳值
        address(dict);
    }];
}

@end