2 つのボタンを含むカスタム ビューを 1 つ作成し、次のようにバー ボタン アイテムを作成します。
UIBarButtonItem *leftBarButtonItem =[[UIBarButtonItem alloc] initWithCustomView:userCustomView];
self.navigationItem.leftBarButtonItem = leftBarButtonItem;
編集: 以下のコードは、2 つのボタンを作成する方法の例にすぎません。
UIView *customView = [[UIView alloc] init];
customView.frame = CGRectMake(0, 0, 100, 40);
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button1 setTitle:@"Add" forState:UIControlStateNormal];
button1.frame = CGRectMake(0, 0, 50, 40);
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button2 setTitle:@"del" forState:UIControlStateNormal];
button2.frame = CGRectMake(60, 0, 50, 40);
[customView addSubview:button2];
[customView addSubview:button1];
UIBarButtonItem *barItem =[[UIBarButtonItem alloc] initWithCustomView:customView];
self.navigationItem.leftBarButtonItem = barItem;