Seems like I can alter the onAppear method to do what I want .onAppear() {             items.nsPredicate = NSPredicate(format: "series = %@ AND amount = 0", series)             if(!searchText.isEmpty) {                 items.nsPredicate = NSPredicate(format: "series = %@ AND amount = 0 AND name CONTAINS[cd] %@", series, searchText)             }         }

My previous view has the navigation stack in it

After a bit of digging it appears the issue isn't related to to conversion itself. It's occurring when writing the data to core data. I can resolve it by refreshing the context after each project save, but not sure if its the best way of doing it.

On loading the view I get ProjectEditColourListView: @self, @identity, _viewContext, _editMode, _colourList, @64, @88, _searchText, _isShowingFilterView, _appSetting, _filters changed. ProjectEditColourListView: @self changed. ProjectEditColourListView: @88 changed. Then after selecting a cell ProjectEditColourListView: @88 changed. ProjectEditColourListView: @self changed. ProjectEditColourListView: @88 changed. ProjectEditColourListView: @self changed. ProjectEditColourListView: @self changed.

Not sure why that was in there twice, shouldn't be. I did originally save outside of the project loop but put it inside due to the crashing, as it would allow it to continue from where it left off.

When adding the launch argument it straight away crashes on the fetch in the getHowManyProjectsToUpdate() method with Thread 9: EXC_BREAKPOINT (code=1, subcode=0x199aa51c4) The below is printed to the console CoreData: annotation: Core Data multi-threading assertions enabled.

I've managed to rewrite it to work on a private context and it seems to be working, I've done the conversions several times and so far no crash. Now if I could just speed it up a bit more, its taking about 20 minutes to do 1100 images