iOS 后台持续定位详解(支持ISO9.0以上)

#import 并实现CLLocationManagerDelegate 代理，.h文件完整代码如下：

 #import
 #import

 @interface ViewController : UIViewController

 @end

2.info.list文件:

右键，Add Row,添加的Key为NSLocationAlwaysUsageDescription，其它值默认，示例如下：

3.添加后台定位权限

4.ViewController.m 文件：

(1)定义一个私有CLLocationManager对象

(2)初始化并设置参数（initLocation方法），其中

locationManager.desiredAccuracy设置定位精度，有六个值可选，精度依次递减

kCLLocationAccuracyBestForNavigation 

kCLLocationAccuracyBest

kCLLocationAccuracyNearestTenMeters

kCLLocationAccuracyHundredMeters

kCLLocationAccuracyKilometer

kCLLocationAccuracyThreeKilometers

locationManager.pausesLocationUpdatesAutomatically 设置是否允许系统自动暂停定位，这里要设置为NO，刚开始我没有设置，后台定位持续20分钟左右就停止了！

(3)实现CLLocationManagerDelegate的代理方法，此方法在每次定位成功后调用：

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray*)locations;

*也可以通过实现以下方法：

- (void)locationManager:(CLLocationManager *)manager

didUpdateToLocation:(CLLocation *)newLocation

  fromLocation:(CLLocation *)oldLocation

(4)实现CLLocationManagerDelegate的代理方法，此方法在定位出错后调用：

-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error

.m文件完整代码如下：

 #import "ViewController.h"

 @interface ViewController (){
     CLLocationManager *locationManager;
     CLLocation *newLocation;
     CLLocationCoordinate2D coordinate;
 }

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     [self initLocation];
 }

 #pragma mark 初始化定位
 -(void)initLocation {
     locationManager=[[CLLocationManager alloc] init];
     locationManager.delegate = self;
     locationManager.desiredAccuracy = kCLLocationAccuracyBest;//设置定位精度
     if([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0){
         [locationManager requestAlwaysAuthorization];
     }
       // 9.0以后这个必须要加不加是不能实现后台持续定位的的      if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 9.0) {          locationManager.allowsBackgroundLocationUpdates = YES;      }
     if(![CLLocationManager locationServicesEnabled]){
         NSLog(@"请开启定位:设置 > 隐私 > 位置 > 定位服务");
     }
     locationManager.pausesLocationUpdatesAutomatically = NO;
     [locationManager startUpdatingLocation];
     //[locationManager startMonitoringSignificantLocationChanges];
 }

 #pragma mark 定位成功
 -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
     newLocation = [locations lastObject];
     double lat = newLocation.coordinate.latitude;
     double lon = newLocation.coordinate.longitude;
     NSLog(@"lat:%f,lon:%f",lat,lon);
 }

 #pragma mark 定位失败
 -(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
     NSLog(@"error:%@",error);
 }


 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end