src/core/ViewFactory.php
public static function createLayout(string $layoutName, View $view): ?Layout
    {
        $layoutsRoot = AppHelper::getInstance()->getComponentRoot('layouts');
        $layoutFile  = $layoutsRoot.\DIRECTORY_SEPARATOR
            .strtolower($layoutName).'.php';
        if (is_readable($layoutFile)) {
            return new Layout($layoutFile, $view);
        }
        return null;
    }
public static function createLayout(string $layoutName, View $view): ?Layout
    {
        $layoutsRoot = AppHelper::getInstance()->getComponentRoot('layouts');
        $layoutFile  = $layoutsRoot.\DIRECTORY_SEPARATOR
            .strtolower($layoutName).'.php';
        if (is_readable($layoutFile)) {
            return new Layout($layoutFile, $view);
        }
        return null;
    }
It creates a layout object.
@param string $layoutName The layout name.
@param \nadir2\core\View $view The object of view.
@return \nadir2\core\Layout|null It returns null if layout file isn't
readable.