How to disable scrolling on body in iOS 13 safari (when saved as PWA to the homescreen)?

function unlockScroll () {
    const scrollY = this.body.style.top;
    document.body.style.position = '';
    document.body.style.top = '';
    document.body.style.left = '';
    document.body.style.right = '';
    window.scrollTo(0, parseInt(scrollY || '0') * -1);
};

function lockScroll () {
    document.body.style.position = 'fixed';
    document.body.style.top = `-${window.scrollY}px`;
    document.body.style.left = '0';
    document.body.style.right = '0';
};

In my case (app requires dragging to arrange elements) setting touch-action to none worked to prevent scrolling when dragging certain elements.

e.g.

draggableElement.css('touch-action', 'none') // disable actions
draggableElement.css('touch-action', 'auto') // restore actions