What technologies should a UI/UX designer know?

Question

User interface

A web designer must know html, css and JS in order to at least imagine how the site will be laid out and communicate with the layout designer in the same language. But what should an iOS or Android mobile interface designer know? Let's say I draw an interface in illustrator, but what should I do next?

Answer 1

first you need to know what are the requirements for graphics resources under Android and iOS, for example, for Android, graphics are stored in 4 options due to the variety of screen sizes. You need to know what DPI, NinePatch, official guidelines and other points are. Before drawing the interface, you need to have an idea of ​​how your graphics will be integrated into the application, as an option, you can first look at ready-made psd interfaces and analyze the layers.