The crash log is suggesting that the crash happened while processing string interpolation, not when forced unwrapping. What sort of value are you passing to storeDomain?
OOPer
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If the line mapView.addOverlay(circles as! MKOverlay) causes Unexpectedly found nil, then mapView is nil when findSzczyty(_:) is called.
Frankly, I do not understand your next steps well. Better start a new thread including all the code related and try to explain what you want to do and what you can do now.
When you find some weird things, there may be issues in the place where you think is normal. Better show how you pass storeDomain.
It is very important that how you declare and set the value to domain, and also from where you call createGraphClient().
Your code lacks many types and methods and is hard to run. Can you show a complete code?
Thanks for showing your code. But with adding CheckListSheet.swift into a SwiftUI project, I get 11 errors. Too many anything else.
Thanks for the explanation of the usage of append. Once explained, it looks really reasonable.
Sorry, but an initializer exactly the same as existing type names is sort of misspelling and it should be an identifier exactly the same as existing type names.
I agree. You can send a feature request using Apple's Feedback Assistant. Your request would be classified as duplicate, but the number may affect.
Can you show a code containing full definition of the View?
Thanks for updating your code. I could have confirmed that your code does not cause any build-time errors, whether include your note or not. Hope this answer would help the OP.
Is there a way to get the check to run on completion of the FetchRequest?
Better start a new thread including enough code which represents the new issue. I do not understand what you want to tell with such very small fragment of code.
Thanks for reporting. I will try to find out what's happening, but sorry, I have not enough time as for now.
Thanks for reporting. If you can create a simplified project explaining this issue, it would help many readers.