如何在Laravel Nova中创建一个两步表单？

php artisan nova:resource FormResource

use Laravel\Nova\Fields\Text;
use Laravel\Nova\Fields\Select;

public function fields(Request $request)
{
    return [
        Text::make('First Name')->onlyOnForms(),
        Text::make('Last Name')->onlyOnForms(),

        Select::make('Country')->options([
            'USA' => 'United States',
            'CA' => 'Canada',
            'UK' => 'United Kingdom',
        ])->onlyOnForms(),

        // 其他字段...
    ];
}

php artisan nova:layout TwoStepFormLayout

use Laravel\Nova\Panel;

public function fields(Request $request)
{
    return [
        new Panel('Step 1', [
            Text::make('First Name')->onlyOnForms(),
            Text::make('Last Name')->onlyOnForms(),
        ]),

        new Panel('Step 2', [
            Select::make('Country')->options([
                'USA' => 'United States',
                'CA' => 'Canada',
                'UK' => 'United Kingdom',
            ])->onlyOnForms(),

            // 其他字段...
        ]),
    ];
}

use App\Nova\Layouts\TwoStepFormLayout;

public function fields(Request $request)
{
    return [
        // 其他字段...

        $this->whenCreating(function () {
            return [
                new TwoStepFormLayout(),
            ];
        }),
    ];
}