Is -[UITableView reloadData] asynchronous or synchronous?

Question

When you call -reloadData on a table view instance, does it make all UITableViewDataSource calls async? Thank you.

Answer 1

This method actually just removes all the UITableViewCell views from the table. The data source delegate methods are called when the table is repainted.

So, it's asynchronous.

Edit:

Actually, some calls ARE synchronous. The number of sections & rows and row heights are updated immediately, so, for example contentSize is set correctly after the call. On the other hand, tableView:cellForRowAtIndex: is not called until the table is repainted.