If we talk about
interface, that is scalable interfaces for developing applications on Qt, this is the main problem is that you need to create an interface that will be read perfectly on all screens, whether computer screen or a smartphone screen.
Parameters of the GUI, such as the width and height are specified in pixels in
, but with the same screen resolution on your computer and on your phone (for example, 1366 x 768 pixels) get completely different results. On your computer, button size 40 by 60 pixels would be convenient, I would even say a large, and on the screen of the smartphone is already on it will be difficult to get a finger.
Therefore the development of a single application interface for multiple platforms and screens must be some way to solve the interface problem of scalability.