Content ionScroll not updating view quickly

Ionic Framework ionic-v3
1

I’m trying to change my app’s behaviour depending on the Y scroll position. So i have added an ionScroll event listener. But I’ve noticed that the UI does not update straight away.

@ViewChild(Content) content: Content;
....
ngAfterViewInit() {
    this.content.enableScrollListener();
    this.content.ionScroll.subscribe((scroll: ScrollEvent) => {
        this.position = scroll.startY + scroll.deltaY;
        console.log("" + this.position);
    });
}

If I use this code and scroll, the console updates very rapidly. I get lots of log messages. But if I bind the variable ‘position’ to anything, it only updates once every few seconds.

I tried updating the value in the UI from other sources such as setInterval(…, 100) and the UI updates fast with no problems.

Any theories?

2

@mirata Have you found a solution? I am having the same problem. The components acts strange.

3

No, I gave up. In theory you could attach your own events to page drag.