Weird behaviour of Xcode 11 Debugger - Showing values as nil when there's a value

Question

I just noticed weird behaviour of Xcode11, I am executing same code in Xcode 10 and Xcode 11.

See the below attached screenshot for both the versions.

I am creating a url from String, When I put a debugger and check the value of myUrl it shows nil although at very next line it passes nil check and control goes into the not nil case.

See the console too.

have anyone already faced this type of issue? or I am doing something wrong.

P.S: Already Cleared cache, derived data, clean build, restart Xcode. don't confuse with the breakpoint's location, both are captured with different system.

Thanks in advance.

Answer 1

This is a known bug, affecting LLDB (the Xcode debugger) as well as the REPL. It's purely a matter of display:

https://bugs.swift.org/plugins/servlet/mobile#issue/SR-11593

https://bugs.swift.org/plugins/servlet/mobile#issue/SR-11546

And see:

Instantiated optional variable shows as nil in Xcode debugger

An easy workaround for now is to pass thru the bridged Objective C type. The bug is only with the Swift Foundation overlay type. So in this case just cast to NSURL.

So for example:

But:

This bug is slated to be fixed in Xcode 12.5.