iOS8及之后的定位服务

小伙伴们更新了iOS8系统后，发现有的程序无法定位了，那是因为iOS8对定位隐私做了优化，需要添加一些配置，具体操作如下所示：

1. @interface里：
   CLLocationManager *locationManager;

2. 初始化：
   locationManager = [[CLLocationManager alloc] init];

3. 调用请求：
   [locationManager requestAlwaysAuthorization];
   [locationManager startUpdatingLocation];

4. 在 info.plist里加入：
   NSLocationWhenInUseUsageDescription ，允许在前台获取GPS的描述
   NSLocationAlwaysUsageDescription ，允许在后台获取GPS的描述

//定位对象    
locationManager = [[CLLocationManager alloc] init];    
locationManager.delegate = self;   
locationManager.desiredAccuracy = kCLLocationAccuracyBest;    
locationManager.distanceFilter = kCLDistanceFilterNone;    
if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])    
{        
[locationManager requestWhenInUseAuthorization];    
}    
[locationManager startUpdatingLocation];