ios前台定位，后台定位

IOS前台定位：

1. 获取LocationManager

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

@interface ViewController ()<CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager *locationM;

@end

@implementation ViewController

/** 位置管理者 */
- (CLLocationManager *)locationM
{
    if (!_locationM) {
        _locationM = [[CLLocationManager alloc] init];
        _locationM.delegate = self;
        // IOS8+
        if([[UIDevice currentDevice].systemVersion floatValue] >= 8.0)
        {
            //  如果是iOS8,需要请求授权方式(进行判断,否则在iOS7会崩溃,需要先在info.plist中配置)
            // ios 7执行该方法会奔溃
            // 和Privacy - Location Always and When In Use Usage Description对应，允许前后台定位
            // [_locationM requestAlwaysAuthorization];
            // 和Privacy - Location When In Use Usage Description 对应 允许前台定位
            [_locationM requestWhenInUseAuthorization];
            
            
            // 后台定位
//            if([[UIDevice currentDevice].systemVersion floatValue] >= 9.0){
//                _locationM.allowsBackgroundLocationUpdates = YES;
//            }
        }
        
        _locationM.desiredAccuracy = kCLLocationAccuracyBest;
        
    }
    return _locationM;
}

2. 设置权限回调：

/**
 *  当前定位授权状态发生改变时调用
 *
 *  @param manager 位置管理者
 *  @param status  状态, 申请权限状态返回有代理
 */
-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    
    NSLog(@"%@",@"会不会到这里来了");
    
    switch (status) {
        case kCLAuthorizationStatusNotDetermined:
        {
            NSLog(@"用户未决定");
            break;
        }
        case kCLAuthorizationStatusDenied:
        {
            
            // 判断当前设备是否支持定位, 定位服务是否开启
            if([CLLocationManager locationServicesEnabled])
            {
                NSLog(@"真正被拒绝");
                
                // 提醒给APP 授权
                // iOS8.0- , 截图
                // iOS8.0+ , 通过调用一个方法, 来直接到达设置界面
                // 跳转核心代码
                NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
                if ([[UIApplication sharedApplication] canOpenURL:url]) {
                    //[[UIApplication sharedApplication] openURL: url];
                    
                    NSDictionary* dict=[[NSDictionary alloc] init];
                    [[UIApplication sharedApplication] openURL:url options:dict completionHandler:^(BOOL success) {
            
                    }];
                }
                
            }
            else
            {
                NSLog(@"定位服务被关闭");
                
            }
            break;
        }
            // 系统预留字段
        case kCLAuthorizationStatusRestricted:
        {
            NSLog(@"受限制");
            break;
        }
        case kCLAuthorizationStatusAuthorizedAlways:
        {
            NSLog(@"前后台定位授权");
            break;
        }
        case kCLAuthorizationStatusAuthorizedWhenInUse:
        {
            NSLog(@"前台定位授权");
            break;
        }
            
        default:
            break;
    }
}

3. 定位回调：

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
    NSLog(@"%@",@"定位到了");
    /**
     coordinate : 经纬度 CLLocationCoordinate2D
     altitude : 海拔
     horizontalAccuracy : 如果是负值, 代表当前位置数据不可用
     verticalAccuracy : 海拔  -- 如果是负值, 代表当前海拔数据不可用
     course : 航向 (0.0----359.9)
     speed : 速度
     floor  : 楼层
     方法:
     distanceFromLocation : 计算两个坐标之间的物理直线距离
     */
    CLLocation* location1= [locations lastObject];
    CLLocationCoordinate2D coordinate = location1.coordinate;
    
    NSLog(@"经度:%f,纬度:%f",coordinate.longitude,coordinate.latitude);
    
    // 2.反地理编码
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    CLLocation *location = [[CLLocation alloc] initWithLatitude:coordinate.latitude longitude:coordinate.longitude];
    [geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {
        // 如果有错误,或者解析出来的地址数量为0
        if (placemarks.count == 0 || error){
            NSLog(@"%@",@"该经纬度没有找到对应地址");
            return ;
        }
        
        // 取出地标,就可以取出地址信息,以及CLLocation对象
        CLPlacemark *pm = [placemarks firstObject];
       
        /*
         @property (nonatomic, readonly, copy, nullable) NSString *name; // eg. Apple Inc.  工业路24号
         @property (nonatomic, readonly, copy, nullable) NSString *thoroughfare; // street name, eg. Infinite Loop 工业路
         @property (nonatomic, readonly, copy, nullable) NSString *subThoroughfare; // eg. 1  24号
         @property (nonatomic, readonly, copy, nullable) NSString *locality; // city, eg. Cupertino 深圳市
         @property (nonatomic, readonly, copy, nullable) NSString *subLocality; // neighborhood, common name, eg. Mission District  宝安区
         @property (nonatomic, readonly, copy, nullable) NSString *administrativeArea; // state, eg. CA 广东省
         @property (nonatomic, readonly, copy, nullable) NSString *subAdministrativeArea; // county, eg. Santa Clara
         @property (nonatomic, readonly, copy, nullable) NSString *postalCode; // zip code, eg. 95014
         @property (nonatomic, readonly, copy, nullable) NSString *ISOcountryCode; // eg. US
         @property (nonatomic, readonly, copy, nullable) NSString *country; // eg. United States   中国
         @property (nonatomic, readonly, copy, nullable) NSString *inlandWater; // eg. Lake Tahoe
         @property (nonatomic, readonly, copy, nullable) NSString *ocean; // eg. Pacific Ocean
         */
        
        
#warning 注意:如果是取出城市的话,需要判断locality属性是否有值(直辖市时,该属性为空)
        NSLog(@"name:%@,城市是:%@--城市2:%@,街道是:%@--%@,bbbb---%@,sublocality:%@",pm.name,pm.locality,pm.administrativeArea,pm.thoroughfare,pm.subLocality,pm.subThoroughfare
              ,pm.country);
        if (pm.locality) {
            NSLog(@"城市是:%@",pm.locality);
        } else {
            NSLog(@"城市是:%@",pm.administrativeArea);
        }
    }];
    
    
    
    //  [manager stopUpdatingLocation];
}

// 定位失败时调用
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"定位失败");
    
}

4. 手动开启定位：

[self.locationM requestLocation];

// 后台定位

// [self.locationM startUpdatingLocation];

5. 申请权限info.plist中