How can we create class diagram in Xcode 7 and above?

Seen this SO thread?https://stackoverflow.com/questions/38576188/xcode-6-7-project-generate-class-diagram-uml

OmniGiraffe might be the key, but you should study that thread for starters.

I Googled : Swift draw class diagram

I got many references, with references to tools:

- h ttps://martinmitrevski.com/2016/10/12/swift-class-diagrams-and-more/

- h ttps://www.reddit.com/r/swift/comments/4npv8h/tools_for_swift_class_diagrams_dependency_graphs/

- many others

Tell if you find something convenient, that's a much needed tool.

PS: could file a bug report for improvement ; that would fit well in the Instruments of XCode

The source code is in Objective C. So I would be needing the tool which would support it.

Thanks

Have you looked into OmniGiraffe?

Found this ; they mention OmniGraffle, but it seems to have limits

and

a freeware (github, so you could customize):

h ttps://stackoverflow.com/questions/29186136/uml-class-diagrams-for-xcode-swift-programming

Edited

I tested, it's very interesting ; clearly, the set up on the page could be improved (up to us to improve the freeware), but a very good starting point.