Manual retain with ARC

Question

Before ARC I had the following code that retains the delegate while an async operation is in progress:

- (void)startAsyncWork
{
    [_delegate retain];
    // ca         


        

Answer 1

Why not just assign your delegate object to a strong ivar for the duration of the asynchronous task?

Or have a local variable in executeAsyncWork

- (void)executeAsyncWork
{
    id localCopy = _delegate;

    if (localCopy != nil) // since this method is async, the delegate might have gone
    {
        // do work on local copy
    }
}