Login ID and Password using core data iOS
NSFetchRequest *request= [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Entity" inManagedObjectContext:context];
NSPredicate *predicate =[NSPredicate predicateWithFormat:@"username==%@ AND password==%@",self.UsernameTextField.Text, self.PasswordTextField.Text];
[request setEntity:entity];
[request setPredicate:predicate];