This widget gives a little change compare to the regular swipe widget.
For our users it was important to know which layer is swiped.
I added a label to the swipe line that moves with the line and show the id of the layer. The label is change when the user choosing layer.
To install this widget you can just replace the "widget.js" file with the current file (app folder --> widgets --> swipe folder).
Or just replace the swipe widget folder.
I added a link to the /blogs/myAlaskaGIS/2016/03/09/web-appbuilder-developer-edition-customization-resource-list?sr=search... but it would help if you added a little more information/description above.