有.不是很明白

[shywoody]

__strong id delegate = self.delegate;
if (delegate != nil && [delegate respondsToSelector:@selector(actionStageActionRequested:options:)])
[delegate actionStageActionRequested:action options:options];

if (_releaseOnMainThread && ![NSThread isMainThread])
{
    dispatch_async(dispatch_get_main_queue(), ^
    {
        [delegate class];
    });
}

不是很明白在主线程调用class方法的用意