Even if you’re designing your own style of buttons, tab bars etc. these will come in very handy. 4. Use Liveview to preview your user interface It’s impossible to get a good idea of how an iPhone interface will actually look on an iPhone when you’re designing on a monitor. Free Mockup 48 Mockups are used to present an artwork to the client or the public to attain feedback. Presentation is a crucial asset of creative designers.