yii2的GridView和ActiveDataProvider具体使用

1.控制器中(以User模块的列表为例)：

第一步：

use backend\models\User;
use yii\data\ActiveDataProvider;

第二步：

public function actionIndex()
{
   $model=new User();
    $dataProvider = new ActiveDataProvider([
        'query' => User::find()->orderBy('id'),//此处添加where条件时：'query'=>User::find()->where(['username'=>'lizi']);
    ]);
    return $this->render('index', [
        'model' => $model,
        'dataProvider' => $dataProvider,
    ]);
}

2.view文件中：

第一步：

use yii\helpers\Html;
use yii\grid\GridView;
use backend\models\User;

第二步：

<?=
GridView::widget([
    'dataProvider' => $dataProvider,
    'columns' => [
        'id',
        [
            'attribute' => 'username',
            'content' => function($dataProvider){
                return $dataProvider['username'];
            },
        ],
        'email:email',
        [
            'attribute' => 'created_at',
            'format' =>  ['date', 'php:Y-m-d H:i:s'],
        ],
        [
            'class' => 'yii\grid\ActionColumn',
            'header' => '操作',
            'template' => '{view}{update}{password}{delete}',
            'headerOptions' => ['width' => '128', 'class' => 'padding-left-5px',],
            'contentOptions' => ['class' => 'padding-left-5px'],
            'buttons' => [
                'password' => function ($url, $model, $key) {
                    return Html::a('<span class="glyphicon glyphicon-edit"></span>', $url, [
                        'title' => '修改密码',
                        'data-method' => 'post',
                        'data-pjax' => '0',
                    ]);
                },
            ],
        ],
    ],
]); ?>
3.运行效果如下图：