I thought you could solve this by yourself and actually you made it. Happy coding.

Please show enough information.

Every developer may make wrong decisions... But I cannot find any description in the Apple's documentation of RunLoop that states how calling run() would work in the main thread which is already managed by RunLoop. I should have used semaphore and DispatchQueue > If you are working with some async tasks, never try to use them synchronously. Using semaphore would cause many more problems, as you may already know. Anyway, changes of undocumented behavior might be intentional or not intentional, you can challenge with sending a feedback to Apple.

If your solution works as expected, please do not forget to mark your answer as SOLVED.

@donnist78 , Please show the exact code you get the error "Cannot convert value of type 'String' to expected argument type 'Int'". The line if Int(cell.dayOfMonth.text = "\(indexPath.item)" > 0 { cause bunch of other errors.

Please show enough information if you really want to be help. You have not shown even the type of devices or what you have done when you get that error. No way to help.

Thanks for showing the screen shots. You can include images both for questions and answers, but the editing feature of this site is very limited and you many need to use Your Answer to post an additional info including images. Anyway, I have never seen the second shot of yours. I will post something here when I find possibly useful info.

Sorry, usually I do not use any pods. And in a usual project, creating the Archive build configuration with copying the Release build configuration works as expected. Better find a communication site of CocoaPods and ask there.

Unfortunately, that would happen quite often. Anyway, happy to hear it works now.

Have you followed all the changes? let leftButton = AnnotationButton(frame: CGRect( //<-

Thanks for showing the code. But, sorry, I do not say something sure under the info shown and I do not think of what to ask next. Hope your issue will be solved soon.

I mean AlbumDetails, AppleMusicAPI or WebImage by many parts missing in your shown code. Those are parts of your code needed to try compiling your shown code. And all such things may affect when you get weird errors such as CompileSwiftSources Failed with a nonzero exit code. Anyway, thanks for reporting.

Thanks for clarifying the reasons. It is quite reasonable and you can learn more than just touching the latest tutorials. One of the reasons Apple provides the dev forums might be that supporting the developers who watched sessions using some beta versions of software is important. You know that many readers here want to help you. And I do hope you will make great apps in the near future, Good Luck!

One thing sure is that you should show enough code when asking someone to help. If something you think has nothing to do with this problem actually had nothing, this sort of thing might not happen. One more, you should better not force readers go into links, if you really want some help in this site.

Better move to Swift.