Swift UI

What is the difference between Swift vs Swift Ui?? 

They are totally different kinds of objects.

Swift is a language (as Objective C)
SwiftUI is a framework for building UI, just as UIKit.

The name comes from the fact that it is a UI framework to use in Swift. A bit misleading.

What is the difference between building app with Xcode vs without code??

You need Xcode to build apps..
Your question is not clear. What do you mean "without code" ?
Do you mean ?
What is the difference between building app with Interface Builder vs without ??

I've had same question as you have.

The Swift UI is just a flamework for Swift, a programming language. So, although you create apps for Apple platforms, you'll need to write lots of lines of code.

But what Swift UI is great is the simplicity of writing and understanding code.

You can easily understand what the code means!