从IOS 8起，您需要在启动CLLocationManager之前请求授权。

Since IOS 8 you need to ask for authorization before starting the CLLocationManager.

您是否正在调用其中一种方法？

Are you calling one of these methods?

[self.locationManager requestWhenInUseAuthorization];  // For foreground access
[self.locationManager requestAlwaysAuthorization]; // For background access

如果您在XCode 6之前创建了项目，则可能还需要添加新权限的info.plist条目。

If you have created the project before XCode 6, you probably also need to add the info.plist entry for the new permission.

有关详细信息，请查看此帖：位置服务在iOS 8中无效

For more details have a look at this post: Location Services not working in iOS 8