如何为iOS动态更改用户界面设计？

I am using Xcode 9.2 and Swift 4.0, and I am looking for the rightful and modern way to draw dynamically changing interface for iOS app. For example, please, look at this pictures (if blue view is hidden or disappears, then red view must take all screen):I am using Xcode 9.2 and Swift 4.0, and I am lo