NSMutableArray *userList = [userDefaults objectForKey:@"userList"]; if(userList){ if(![userList containsObject:self.email]){ [userList addObject:self.email]; } }else{ userList = [NSMutableArray array]; [userList addObject:self.email]; } [userDefaults setObject:userList forKey:@"userList"]; [userDefaults synchronize];
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