Have I need to record data manually to record the changes with time within core data?
<p>I tend to show the everyday changes on the chart view in iOS app which using Core Data.</p>

<p>As the result, I need to know the data's fluctuation in the pass.</p>

<p>I know the managedObjectContext will record some data, but not persistence.</p>

<p>My question is that </p>

<p><strong>Can I fetch data's changes from Core Data directly?</strong> </p>

<p><strong>or It is necessary to record manually when every time change.</strong></p>