I really have problem with Affinity. Developers do not want work with affinity designer project. Because no Avocode support, no Zepelin support, no InVision support. How developer can get object info easy? Like Avocode or Zepelin.
Now, Affinity Designer - it is not good instrument for UI. When you create Affinity Designer you must understand, that developers will use project. And Affinity do not have nothing for developers. (Only slice instruments). How developers can fast get info CSS (in one click) for button or text? I need to make my UI design in Sketch. :( Its more faster and easy for developers.
Maybe you will make special app for this?