title: Will items in iOS keychain survive app uninstall and reinstall?
body: <p>I am looking for documentation about the iOS keychain items. My specific question is if keychain items will survive an app uninstall and reinstall cycle.
  It seems to work that way since iOS 4 (or maybe even iOS 3), but I cannot find any documentation from Apple stating that this actually is supposed to work this way.</p>
  
  <p>What I am trying to figure out is if I can TRUST (not "hope for" or "guess") that items in the keychain will survive the app uninstall.</p>
  
  <p>EDIT: I realize that the question is a bit unclear as pointed out by Daij-Djan. What I am looking for is official documentation that backs up the well-known behaviour.</p>
  
  <p>UPDATE 2017-04-04: See my answer below, the behaviour change in iOS 10.3 beta. It works as usual in iOS 10.3 but may probably change in future versions.</p>