How are the UI Components registered




$uiReader is \Magento\Framework\View\Element\UiComponent\Config\Reader


$fileCollector is \Magento\Framework\View\Element\UiComponent\Config\FileCollector\AggregatedFileCollector


$searchPattern is etc/definition.xml


https://github.com/magento/magento2/blob/c58d2d/lib/internal/Magento/Framework/View/Element/UiComponent/Config/FileCollector/AggregatedFileCollector.php#L76-L76



See also: