My watch extension displays a WKInterfaceTable when new data is available. This can happen any time.
Depending on the situation, an alert can also be shown any time.
The problem:
When the WKInterfaceTable is updated while the alert is shown, I get the following log:
Watch Extension[58209:13081232] [TableView] Warning once only: UITableView was told to layout its visible cells and other contents without being in the view hierarchy (the table view or one of its superviews has not been added to a window). This may cause bugs by forcing views inside the table view to load and perform layout without accurate information (e.g. table view bounds, trait collection, layout margins, safe area insets, etc), and will also cause unnecessary performance overhead due to extra layout passes. Make a symbolic breakpoint at UITableViewAlertForLayoutOutsideViewHierarchy to catch this in the debugger and see what caused this to occur, so you can avoid this action altogether if possible, or defer it until the table view has been added to a window.
I did set this breakpoint and the app stopped at the critical point, but I don’t know how to proceed:
Since both events are asynchronous, I had to check before any WKInterfaceTable update if an alert is shown, and to defer the update until the alert has been dismissed. I cannot believe that this is what one should do.
What is the right solution?
EDIT:
Sorry, by now I found this post and it seems as if this is a warning that can simply be ignored...
I have the same issue while displaying an alert. Funny that it's coming from UITableView, while using a WKInterfaceTable. I also assume it can be ignored, but open to anyone else's solutions that actually removed the warning.