Do I need to use @synchronized when calling UITableView reloadData method?

Question

I have many threads calling UITableView's reloadData method concurrently. Do I actually have to put a @synchronized block around it?

Answer 1

reloadData, like any other method on a view, should only be called from the main thread only. So you don't need @synchronized because only one thread should be there at a time.

If you're on a background thread and you want the table view to reload, use dispatch_async to make sure the reload happens on the main thread:

dispatch_async(dispatch_get_main_queue(), ^{
    [myTableView reloadData];
});

Answer 2

You shouldn't call reloadData from threads other than the main thread.

See this similar question:

iOS - another thread needs to send reloadData to the mainthread