how to connect postgresql in swift

Same comment as for your other thread: take the time to explain what you want, not just throw a very general question.

Note: if you are a newbie here, you'd probably better start with some simpler stuff.

You can also do some search on the web:

w ww.alwaysrightinstitute.com/directtoswiftui/

Please also post your questions on SwiftUI in SwiftUI section or the forum.