#import CoreLocation/CoreLocation.h 并实现CLLocationManagerDelegate 代理，.h文件完整代码如下：
@interfaceViewController:UIViewController CLLocationManagerDelegate @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
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
.m文件完整代码如下：@interfaceViewController(){CLLocationManager*locationManager;CLLocation*newLocation;CLLocationCoordinate2Dcoordinate;}@end@implementationViewController-(void)viewDidLoad{[superviewDidLoad];[selfinitLocation];}#pragmamark初始化定位-(void)initLocation{locationManager=[[CLLocationManageralloc]init];locationManager.delegate=self;locationManager.desiredAccuracy=kCLLocationAccuracyBest;//设置定位精度if([[[UIDevicecurrentDevice]systemVersion]floatValue] =8.0){[locationManagerrequestAlwaysAuthorization];}
// 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([[[UIDevicecurrentDevice]systemVersion]floatValue] =9.0) {
locationManager.allowsBackgroundLocationUpdates=YES;
}
if(![CLLocationManagerlocationServicesEnabled]){NSLog(@"请开启定位:设置 隐私 位置 定位服务");} locationManager.pausesLocationUpdatesAutomatically=NO;[locationManagerstartUpdatingLocation];//[locationManagerstartMonitoringSignificantLocationChanges];}#pragmamark定位成功-(void)locationManager:(CLLocationManager*)managerdidUpdateLocations:(NSArray*)locations{newLocation=[locationslastObject];doublelat=newLocation.coordinate.latitude;doublelon=newLocation.coordinate.longitude;NSLog(@"lat:%f,lon:%f",lat,lon);}#pragmamark定位失败-(void)locationManager:(CLLocationManager*)managerdidFailWithError:(NSError*)error{NSLog(@"error:%@",error);}-(void)didReceiveMemoryWarning{[superdidReceiveMemoryWarning];//Disposeofanyresourcesthatcanberecreated.}@end