Clearing NSUserDefaults

ios objective-c cocoa-touch nsuserdefaults

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.

ios objective-c cocoa-touch nsuserdefaults

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 objective-c cocoa-touch nsuserdefaults

Did you try using -removeObjectForKey?

 [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"defunctPreference"];

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