how to do custom pagination magento 2 code example

Example 1: pagination magento

protected function _prepareLayout()
{
    parent::_prepareLayout();
    $this->pageConfig->getTitle()->set(__('News'));


    if ($this->getNews()) {
        $pager = $this->getLayout()->createBlock(
            'Magento\Theme\Block\Html\Pager',
            'test.news.pager'
        )->setAvailableLimit(array(5=>5,10=>10,15=>15))->setShowPerPage(true)->setCollection(
            $this->getNews()
        );
        $this->setChild('pager', $pager);
        $this->getNews()->load();
    }
    return $this;
}

Example 2: pagination magento

public function getNews()
    {
      //get values of current page
        $page=($this->getRequest()->getParam('p'))? $this->getRequest()->getParam('p') : 1;
    //get values of current limit
        $pageSize=($this->getRequest()->getParam('limit'))? $this->getRequest()->getParam('limit') : 1;


        $newsCollection = $this->newscollectionFactory->create();
        $newsCollection->addFieldToFilter('is_active',1);
        $newsCollection->setOrder('title','ASC');
        $newsCollection->setPageSize($pageSize);
        $newsCollection->setCurPage($page);
        return $newsCollection;
    }