They are two completely different things. The launch screen is what first appears when the user taps the app icon before the app is finished launching. It shows a single, static screen. It can't be dynamic and it can't use any custom classes or code. It's the replacement for launch images.
The main storyboard is what your app actually displays when the app is running. It contains your app, code, and logic.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…