判断定位功能是否开启封装方法

定位，是现在项目中经常遇到的需求，而对于iOS，更是经常会遇到需求说判断用户是否开启定位，从而来进行下一步逻辑，否则很可能影响用户体验甚至导致app go die。所以，判断iPhone是否已经开启定位功能使用并且有必要。
/**

• 总定位服务是否开始
• @return
  */

• (BOOL)isLocationServiceOn;

/**

• 当前app服务定位是否开启
• @return
  */

• (BOOL)isCurrentAppLocatonServiceOn;

/**

• 当前app服务定位是否已决定
• @return
  */

• (BOOL)isLocationServiceDetermined;

• (BOOL)isLocationServiceOn
  {
  return [CLLocationManager locationServicesEnabled];
  }

• (BOOL)isCurrentAppLocatonServiceOn
  {
  CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
  if (kCLAuthorizationStatusDenied == status || kCLAuthorizationStatusRestricted == status) {
  return NO;
  } else {
  return YES;
  }
  }

• (BOOL)isLocationServiceDetermined
  {
  CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
  if (kCLAuthorizationStatusNotDetermined == status) {
  return NO;
  } else {
  return YES;
  }

}

比如 我要判断用户是否允许app定位
if (![self isCurrentAppLocatonServiceOn]) {
//没有开启
todosomething...
}else {
//已经开启
todosomething...
}