Delete keychain items when an app is uninstalled

Question

I am using idandersen s scifihifi-iphone code for keychain and save password using   SFHFKeychainUtils storeUsername   User  andPassword   123                forServiceName   TestService  updateExisting YES error  amp error     When I delete the application from the device  the password remains in the keychain   I want to remove the password from the keychain when the user deletes the application from the device  How can I do this

User · Answer

For those looking for a Swift version of  amro s answer       let userDefaults   NSUserDefaults standardUserDefaults        if userDefaults boolForKey  hasRunBefore      false               remove keychain items here              update the flag indicator         userDefaults setBool true  forKey   hasRunBefore           userDefaults synchronize      forces the app to update the NSUserDefaults          return

User · Answer

Just add an app setting bundle and implement a toggle to reset the keychain on app restart or something based on the value selected through settings  available through userDefaults

User · Answer

There is no trigger to perform code when the app is deleted from the device  Access to the keychain is dependant on the provisioning profile that is used to sign the application  Therefore no other applications would be able to access this information in the keychain    It does not help with you aim to remove the password in the keychain when the user deletes application from the device but it should give you some comfort that the password is not accessible  only from a re-install of the original application

User · Answer

You can take advantage of the fact that NSUserDefaults are cleared by uninstallation of an app  For example   -  BOOL application  UIApplication   application didFinishLaunchingWithOptions  NSDictionary   launchOptions         Clear keychain on first run in case of reinstallation     if     NSUserDefaults standardUserDefaults  objectForKey   FirstRun                 Delete values from keychain here           NSUserDefaults standardUserDefaults  setValue   1strun  forKey   FirstRun              NSUserDefaults standardUserDefaults  synchronize                   Other stuff that usually happens in didFinishLaunching     This checks for and sets a  FirstRun  key value in NSUserDefaults on the first run of your app if it s not already set  There s a comment where you should put code to delete values from the keychain  Synchronize can be called to make sure the  FirstRun  key value is immediately persisted in case the user kills the app manually before the system persists it

User · Answer

C  Xamarin version      const string FIRST RUN    hasRunBefore       var userDefaults   NSUserDefaults StandardUserDefaults      if   userDefaults BoolForKey FIRST RUN                   TODO  remove keychain items         userDefaults SetBool true  FIRST RUN           userDefaults Synchronize                and to clear records from the keychain  TODO comment above           var securityRecords   new     SecKind GenericPassword                                      SecKind Certificate                                      SecKind Identity                                      SecKind InternetPassword                                      SecKind Key                                            foreach  var recordKind in securityRecords                        SecRecord query   new SecRecord recordKind               SecKeyChain Remove query

User · Answer

Files will be deleted from your app s document directory when the user uninstalls the app   Knowing this  all you have to do is check whether a file exists as the first thing that happens in application didFinishLaunchingWithOptions   Afterwards  unconditionally create the file  even if it s just a dummy file      If the file did not exist at time of check  you know this is the first run since the latest install   If you need to know later in the app  save the boolean result to your app delegate member

User · Answer

For users looking for a Swift 3 0 version of  amro s answer   let userDefaults   UserDefaults standard  if  userDefaults bool forKey   hasRunBefore             Remove Keychain items here          Update the flag indicator      userDefaults set true  forKey   hasRunBefore        note that synchronize   function is deprecated

User · Answer

This seems to be the default behavior on iOS 10 3 based on behavior people have been witnessing in beta  2  Haven t found any official documentation about this yet so please comment if you have

User · Answer

amro s answer translated to Swift 4 0   if UserDefaults standard object forKey   FirstInstall      nil       UserDefaults standard set false  forKey   FirstInstall       UserDefaults standard synchronize

[ios] Delete keychain items when an app is uninstalled

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