xslide | Dynamic cross platform slider menu with additional info pull | Mobile library

I'm setting this loop up with three animations, the first one that runs on initial screen load (firstAnimation). Then the next two animations use callbacks to loop between themselves (slideAnimation -> rotateAnimation -> slideAnimation...)

How can I stop the animation whichever animation it's in using POINTERDOWN and resume it on PONTERUP..?

The way I have done it below works only during the firstAnimation, as soon as its in the loop it obviously no longer targets those two animations. So how would I target all three animations using a single .pause() .resume() command?

This is what I have so far..

I am struggling to achieve what should be a simple task.

1. Page Loads
2. User freely scrolls down through different sections.
3. When a specific DIV reaches the centre of the page I would like to pause/prevent scrolling down until the DIV has been moved horizontally across to the left a fixed number of pixels.
4. Then the user can be allowed to continue scrolling down the page.

Also, I would like to achieve the opposite effect if the user scrolls up i.e. scroll the div to the right a fixed number of pixels before continuing up.

Below is a sample of my code.

I am currently trying to add a button so that I can go to a different page in a UIScrollView but I keep getting the error. Basically I'm creating custom slides that take up about a third of the bottom of the screen with the scrollview.

[App.ViewController aButton:]: unrecognized selector sent to instance 0x7fe464c131c0 2017-07-19 22:47:48.791 App[10680:546634] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[App.ViewController aButton:]: unrecognized selector sent to instance 0x7fe464c131c0'

so far I've read a few posts on here and have tried

pagecontrol.currentpage = 0

and

mainScrollView.contentOffset = CGPoint(x: mainScrollView.frame.size.width*1, y: 0)