指定是否在用户设置中启用位置服务。
应在开始位置更新之前检查此属性，
以确定用户是否为当前设备启用了位置
服务。
在 iOS 上，如果此属性为 false 时仍启动位置
更新，则 CoreLocation 框架通过一个确认面板提示
用户，询问是否应重新启用位置服务。用户
可以通过在“Settings>General>LocationServices”中切换开关，
从 Settings 应用程序一起启用或禁用
位置服务。
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