1. if ([CLLocationManager locationServicesEnabled] &&  
2.                 ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorized  
3.                 || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined)) {  
4.                 //定位功能可用，开始定位  
5.                 _locationManger = [[CLLocationManager alloc] init];  
6.                 locationManger.delegate = self;  
7.                 [locationManger startUpdatingLocation];  
8.             }  
9.             else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied){  
10.         NSlog("定位功能不可用，提示用户或忽略");   
11.             }  

ios 里如何判断当前应用的定位服务是否可用