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I know Apple said all UI-related operations should be carried out on main thread.
So my question is “all UI-related operations” really mean every possible UI-related operaton?
For example, I will addSubview ViewB to ViewA in a separate thread. Should I always use [ViewA performSelectorOnMaintThread:@selector(addSubview:)…… on the separate thread?
thanks
Yes.
It will crash otherwise.