protected function getIterator(): ?NavigationIterator
    {
        $parent = $this->getParent();

        if (!$parent) {
            return null;
        }

        try {
            return $this->getTabRegistry()->getIterator((string) $parent->id);
        } catch (AssertionFailedException $e) {
            return null;
        }
    }
protected function getIterator(): ?NavigationIterator
    {
        $parent = $this->getParent();

        if (!$parent) {
            return null;
        }

        try {
            return $this->getTabRegistry()->getIterator((string) $parent->id);
        } catch (AssertionFailedException $e) {
            return null;
        }
    }
protected function getIterator ( ) : ? NavigationIterator { $ parent = $ this -> getParent ( ) ; if ( ! $ parent ) { return null ; } try { return $ this -> getTabRegistry ( ) -> getIterator ( ( string ) $ parent -> id ) ; } catch ( AssertionFailedException $ e ) { return null ; } }
Get the tab navigation iterator.

@return NavigationIterator
Get the tab navigation iterator .