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:&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?

Answer 1

For users looking for a Swift 3.0 version of @amro's answer:

let userDefaults = UserDefaults.standard

if userDefaults.bool(forKey: "hasRunBefore") == false {
     // Remove Keychain items here

     // Update the flag indicator
     userDefaults.set(true, forKey: "hasRunBefore")
     userDefaults.synchronize() // Forces the app to update UserDefaults
}

Answer 2

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
    }