Need to disable scroll of content

Ionic Framework ionic-v3
1

Is it possible to disable the scroll? Was this removed from ionic2? The problem ist that I have a overlay over the content with an opacity, but the user is still able to scroll the main content.:

2

That is how I did it:

public toggleToolbar() {
    this.toolbarActive = !this.toolbarActive;

    if (this.toolbarActive) {
        this.content.removeCssClass("no-scroll");
        this.content.addCssClass("scroll");
    } else {
        this.content.removeCssClass("scroll");
        this.content.addCssClass("no-scroll");
    }

    this.content.resize();
}

If you guys have any better suggestion please let me know.