Check out this password generator app that shows various techniques including using a data container singleton object to share data between objects in your project.
the best way to guage uninstalls is to count the number of people who upgrade after you release a new version.
if you sold 100 copies of your app and then release a new version and notice 75 of them upgrade in the next couple of weeks, you can assume about a 25% uninstall rate.
Get notified if user has uninstalled my app
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