UICollectionView Decoration and Supplementary views can not be moved

Question

In UICollectionView decoration and supplementary views seem to be a big mystery. There seems to be next to no example code at the moment. I managed to get both type

Answer 1

I know this is an old question but I came across this when having problems with supplementary views being duplicated all over the place when invalidating a layout. I believe it's a bug, and I fixed it by ove-riding invalidateLayout in my layout object and removing the supplementary views as below:

- (void)invalidateLayout {
    [super invalidateLayout];
    // Manually remove all suplementary views of a certain type
    /**
     ** This appears to be a BUG. Invalidate view does not remove suplementary view
     **     from the view hierachy. But they are Orphaned so stay on screen. 
     **/
    for (UIView *subview in [self.collectionView subviews]) {
        if ([subview isKindOfClass:[UICollectionReusableView class]]) {
            [subview removeFromSuperview];
        }
    }
}

Replace UICollectionReusableView with the class of your re-usable view that is being left on screen.

Hope this helps someone.