Clearing NSUserDefaults

Question

I m using   NSUserDefaults standardUserDefaults  to store application settings  This consists of roughly a dozen string values  Is it possible to delete these values permanently instead of just setting them to a default value

User · Answer

I love extensions when they make the code cleaner:

extension NSUserDefaults {
    func clear() {
        guard let domainName = NSBundle.mainBundle().bundleIdentifier else {
            return
        }

        self.removePersistentDomainForName(domainName)
    }
}

Swift 5

extension UserDefaults {
    func clear() {
        guard let domainName = Bundle.main.bundleIdentifier else {
            return
        }
        removePersistentDomain(forName: domainName)
        synchronize()
    }
}

User · Answer

I found this   osascript -e  tell application  iOS Simulator  to quit  xcrun simctl list devices   grep -v    -      cut -d     -f2   cut -d     -f1   xargs -I    xcrun simctl erase        Source  https   gist github com ZevEisenberg 5a172662cb576872d1ab

User · Answer

Note  This answer has been updated for Swift too   What about to have it on one line   Extending  Christopher Rogers answer     the accepted one     NSUserDefaults standardUserDefaults  removePersistentDomainForName   NSBundle mainBundle  bundleIdentifier      and yes  sometime you may need to synchronize it     NSUserDefaults standardUserDefaults  synchronize     I ve created a method to do this   -  void  clearDefaults         NSUserDefaults standardUserDefaults  removePersistentDomainForName   NSBundle mainBundle  bundleIdentifier          NSUserDefaults standardUserDefaults  synchronize         Swift   With swift its even more easy   extension UserDefaults       class func clean             guard let aValidIdentifier   Bundle main bundleIdentifier else   return           standard removePersistentDomain forName  aValidIdentifier          standard synchronize             And usage   UserDefaults clean

User · Answer

If you need it while developing  you can also reset your simulator  deleting all the NSUserDefaults   iOS Simulator -  Reset Content and Settings     Bear in mind that it will also delete all the apps and files on simulator

User · Answer

NSDictionary  defaultsDictionary     NSUserDefaults standardUserDefaults  dictionaryRepresentation   for  NSString  key in  defaultsDictionary allKeys                           NSUserDefaults standardUserDefaults  removeObjectForKey key

User · Answer

In Swift   let defaults   NSUserDefaults standardUserDefaults   defaults dictionaryRepresentation   keys forEach   defaults removeObjectForKey  0

User · Answer

Expanding on  folse s answer    I believe a more correct implementation would be     NSString  appDomain     NSBundle mainBundle  bundleIdentifier   NSDictionary  defaultsDictionary     NSUserDefaults standardUserDefaults  persistentDomainForName  appDomain       for  NSString  key in  defaultsDictionary allKeys           NSLog   removing user pref for      key           NSUserDefaults standardUserDefaults  removeObjectForKey key              calling NSUserDefault s persistentDomainForName  method  As the docs state  the method  Returns a dictionary containing the keys and values in the specified persistent domain   Calling dictionaryRepresentation  instead  will return a dictionary that will likely include other settings as it applies to a wider scope   If you need to filter out any of the values that are to be reset  then iterating over the keys is the way to do it  Obviously  if you want to just nuke all of the prefs for the app without regard  then one of the other methods posted above is the most efficient

User · Answer

Did you try using -removeObjectForKey      NSUserDefaults standardUserDefaults  removeObjectForKey   defunctPreference

User · Answer

You can remove the application s persistent domain like this   NSString  appDomain     NSBundle mainBundle  bundleIdentifier     NSUserDefaults standardUserDefaults  removePersistentDomainForName appDomain     In Swift 3 and later   if let bundleID   Bundle main bundleIdentifier       UserDefaults standard removePersistentDomain forName  bundleID      This is similar to the answer by  samvermette but is a little bit cleaner IMO

User · Answer

Try This  It s working for me    Single line of code     NSUserDefaults standardUserDefaults  removePersistentDomainForName   NSBundle mainBundle  bundleIdentifier

User · Answer

Here is the answer in Swift   let appDomain   NSBundle mainBundle   bundleIdentifier  NSUserDefaults standardUserDefaults   removePersistentDomainForName appDomain

User · Answer

if the application setting needing reset is nsuserdefault for access to microphone  my case   a simple solution is answer from Anthony McCormick   Iphone - How to enable application access to media on the device  - ALAssetsLibraryErrorDomain Code -3312  quot Global denied access quot     on the device  go to Settings General Reset Reset Location Warnings

User · Answer

All above answers are very relevant  but if someone still unable to reset the userdefaults for deleted app  then you can reset the content settings of you simulator  and it will work

User · Answer

It s a bug or whatever but the removePersistentDomainForName is not working while clearing all the NSUserDefaults values   So  better option is that to reset the PersistentDomain and that you can do via following way   NSUserDefaults standardUserDefaults   setPersistentDomain          forName  NSBundle mainBundle   bundleIdentifier

User · Answer

This code resets the defaults to the registration domain     NSUserDefaults standardUserDefaults  setPersistentDomain  NSDictionary dictionary  forName   NSBundle mainBundle  bundleIdentifier      In other words  it removeObjectForKey for every single key you ever registered in that app   Credits to Ken Thomases on this Apple Developer Forums thread

[ios] Clearing NSUserDefaults

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