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POiOS Autosaved object
 

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    <p>In my app I have Singleton object, which should save its state through app launches. So I need to save it somehow.</p> <p>I see only two options: 1) save it on app termination (plus, maybe, going background); 2) save it each time any property changed.</p> <p>First option looks bad, because app can be killed, for example, because of some bug, memory limits or device power-off (low battery). So I expect state won't be saved.</p> <p>Second option needs either manual notifications about each change, or KVO + observing of each property.</p> <p>Seems that I do something wrong here. Maybe, you can give me some advice or there is some well-known pattern (I've tried to google, but found nothing particular).</p> <p><strong>UPDATE:</strong></p> <p>Yes, there is <code>NSUserDefaults</code>, but to improve its usability (smth. more than just key-values) I would write wrapper-methords, so I will end with the same problem (lines of manual coding).</p> <p><strong>UPDATE2:</strong></p> <p><code>CoreData</code> is also bad choice for me: just one object to store + inserting there also needs some more lines of code.</p> <p><strong>UPDATE3:</strong></p> <p>It's not a question about "how to save". It's about "how to call this saving automatically (or with less of coding)". So in <code>NSUserDefault</code> way we need to manually implement each property as wrapper. In <code>NSCoding</code> - call <code>save</code> or post notification (to catch &amp; save from one place) from each property also.</p>
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    1. COYou can use [NSUserDefaults](http://www.icodeblog.com/2008/10/03/iphone-programming-tutorial-savingretrieving-data-using-nsuserdefaults/), it synchronizes automatically (or manually if you prefer)
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    2. COYou can also implement the NSCoding protocol to save the whole class: see [this question](http://stackoverflow.com/questions/3000220/best-way-to-save-to-nsuserdefaults-for-custom-class)
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    3. COsimpleBob, question is not how to save, but how to make those changes enough frequent (ideally - automatic) to store object up-to-date.
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