controllers/AuthController.php
public function actionLogin()
	{
		// If the user is logged in, redirect to dashboard
		if (!Yii::$app->user->isGuest)
			return $this->redirect(Yii::$app->user->returnUrl);

		$model = new AccountLoginForm();

		if ($model->load(Yii::$app->request->post()) && $model->validate() && $model->login())
			return $this->redirect(Yii::$app->user->returnUrl);

		return $this->render('login', [
			'model'              => $model,
			'canRegister'        => UserModule::$canRegister,
			'canRecoverPassword' => UserModule::$canRecoverPassword
		]);
	}
public function actionLogin()
	{
		// If the user is logged in, redirect to dashboard
		if (!Yii::$app->user->isGuest)
			return $this->redirect(Yii::$app->user->returnUrl);

		$model = new AccountLoginForm();

		if ($model->load(Yii::$app->request->post()) && $model->validate() && $model->login())
			return $this->redirect(Yii::$app->user->returnUrl);

		return $this->render('login', [
			'model'              => $model,
			'canRegister'        => UserModule::$canRegister,
			'canRecoverPassword' => UserModule::$canRecoverPassword
		]);
	}
Displays the login page.

@return string|\yii\web\Response