是否可以在后台模式下使用 startMonitoringSignificantLocationChanges 获取 ivars
当应用程序在后台或终止时使用 startMonitoringSignificantLocationChanges 时，如果检测到重大更改，Apple 会声明将应用程序带回前台。但是，我仍然能够在 didUpdateToLocation CLLocationManager 委托方法中获取 ivar 的值（之前在应用程序位于前台时设置）吗？还是丢失了？
如果丢失，在应用程序终止/后台运行并由位置管理器带回前台后保留这些值的最佳方法是什么？
When an app uses startMonitoringSignificantLocationChanges while backgrounded or when terminated, if a significant change is detected Apple states that it will bring the app back into the foreground. But, will I still be able to get the value of an ivar (previously set when the app was in the foreground) within the didUpdateToLocation CLLocationManager delegate method? Or is it lost?
If it is lost, what is the best way to persist those values after the app has terminated/backgrounded and brought back into the foreground by the location manager?
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是的，你当然会的。失去该 ivar 值的唯一方法是，如果您的应用程序实际上已退出并重新启动，此时您并不是简单地从后台返回。
Yes of course you will. The only way you'd lose the value of that ivar is if your app has actually quit and been relaunched, at which point you're not simply coming back from the background.