iOS系统定位（一）

第一步.添加库 CoreLocation.framework
第二步.在info.plist文件里添加这两个描述获得用户的允许权限
1.Privacy - Location When In Use Usage Description -> 是否允许此App在使用期间访问你的位置?
2.Privacy - Location Always Usage Description -> 是否允许此App永久访问你的位置?
第三步.上代码
//1导入头文件
#import <CoreLocation/CoreLocation.h>
//2设置代理
@interface VoiceController ()<CLLocationManagerDelegate>

//3设置属性
@property (nonatomic,strong ) CLLocationManager *locationManager;//定位服务
@property (nonatomic,copy)    NSString *currentCity;//城市
@property (nonatomic,copy)    NSString *strLatitude;//经度
@property (nonatomic,copy)    NSString *strLongitude;//维度
//4 属性操作
if ([CLLocationManager locationServicesEnabled]) {
        _locationManager = [[CLLocationManager alloc]init];
        _locationManager.delegate = self;
        [_locationManager requestAlwaysAuthorization];
        _currentCity = [[NSString alloc]init];
        [_locationManager requestWhenInUseAuthorization];
        _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        _locationManager.distanceFilter = 5.0;
        [_locationManager startUpdatingLocation];
    }
//5代理方法
//定位失败
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"请在设置中打开定位" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *ok = [UIAlertAction actionWithTitle:@"打开定位" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSURL *settingURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        [[UIApplication sharedApplication]openURL:settingURL];
    }];
    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        
    }];
    [alert addAction:cancel];
    [alert addAction:ok];
    [self presentViewController:alert 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];
    //当前的经纬度
    NSLog(@"当前的经纬度 %f,%f",currentLocation.coordinate.latitude,currentLocation.coordinate.longitude);
    
    
    
    //地理反编码 可以根据坐标(经纬度)确定位置信息(街道 门牌等)
    [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 = @"无法定位当前城市";
            }
            //看需求定义一个全局变量来接收赋值
            NSLog(@"当前国家 - %@",placeMark.country);//当前国家
            NSLog(@"当前城市 - %@",_currentCity);//当前城市
            NSLog(@"当前位置 - %@",placeMark.subLocality);//当前位置
            NSLog(@"当前街道 - %@",placeMark.thoroughfare);//当前街道
            NSLog(@"具体地址 - %@",placeMark.name);//具体地址
            NSString *message = [NSString stringWithFormat:@"%@,%@,%@,%@,%@",placeMark.country,_currentCity,placeMark.subLocality,placeMark.thoroughfare,placeMark.name];
            
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:message delegate:self cancelButtonTitle:nil otherButtonTitles:@"好", nil];
            [alert show];
        }else if (error == nil && placemarks.count){
            
            NSLog(@"NO location and error return");
        }else if (error){
            
            NSLog(@"loction error:%@",error);
        }
    }];
    
    //这里的代码是为了判断didUpdateLocations调用了几次 有可能会出现多次调用 为了避免不必要的麻烦 在这里加个if判断 如果大于1.0就return
    NSTimeInterval locationAge = -[currentLocation.timestamp timeIntervalSinceNow];
    if (locationAge > 1.0){//如果调用已经一次，不再执行
        return;
    }
}
这样就完成了
iOS系统定位（一）

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