2-2-2 app\Admin\Controllers\ProductController.php

<?php

namespace App\Admin\Controllers;

use App\Product;
use Encore\Admin\Controllers\AdminController;
use Encore\Admin\Form;
use Encore\Admin\Grid;
use Encore\Admin\Show;

class ProductController extends AdminController
{
    /**
     * Title for current resource.
     *
     * @var string
     */
    protected $title = 'App\Product';

    /**
     * Make a grid builder.
     *
     * @return Grid
     */
    protected function grid()
    {
        $grid = new Grid(new Product);

        $grid->column('id', __('Id'));
        $grid->column('title', __('Title'));
        $grid->column('description', __('Description'));
        $grid->column('image', __('Image'));
        $grid->column('on_sale', __('On sale'));
        $grid->column('price', __('Price'));
        $grid->column('created_at', __('Created at'));
        $grid->column('updated_at', __('Updated at'));

        return $grid;
    }

    /**
     * Make a show builder.
     *
     * @param mixed $id
     * @return Show
     */
    protected function detail($id)
    {
        $show = new Show(Product::findOrFail($id));

        $show->field('id', __('Id'));
        $show->field('title', __('Title'));
        $show->field('description', __('Description'));
        $show->field('image', __('Image'));
        $show->field('on_sale', __('On sale'));
        $show->field('price', __('Price'));
        $show->field('created_at', __('Created at'));
        $show->field('updated_at', __('Updated at'));

        return $show;
    }

    /**
     * Make a form builder.
     *
     * @return Form
     */
    protected function form()
    {
        $form = new Form(new Product);

        $form->text('title', __('Title'))->rules('required');
        $form->textarea('description', __('Description'))->rules('required');
        $form->image('image', __('Image'));
        $states = [
            'on'  => ['value' => 1, 'text' => '是', 'color' => 'success'],
            'off' => ['value' => 0, 'text' => '否', 'color' => 'danger'],
        ];

        $form->switch('on_sale', __('On sale'))->states($states)->default(1);
        $form->number('price', __('Price'))->default(0)->rules('required|integer|min:0')->attribute('min', 0);

        return $form;
    }
}