Save a parameter isNotFirstInstall in user defaults.standard. Set it to true after you do your 'first install' stuff. If you need this value in the app groups other apps, the main app should make a copy of this value under a different name in the app groups user defaults. When the main app is uninstalled and then installed again, isNotFirstInstall will be nil and then the main app can delete the values in the app groups user defaults since you know all the keys. Let me know if this helps.
yasmin777
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