I noticed that many iPhone apps like Instagram and Twitter don’t have a splash screen, they show an empty version of the UI while the app is loading; then the interface is filled with the rest of the elements. Is it a simple trick that involves a normal splash screen simulating the interface of the app?
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Yes, it is simply an image replicating the look of the app.
Apple recommends doing such a trick to lessen the perceived loading time of the app (see here).