OSX可可NSCollectionViewFlowLayout在缩放/放大上水平滚动不起作用

Question

I want to make a zoom-able NSCollectionView in OSX. I use NSCollectionViewFlowLayout with a vertical flow and set allow magnification to true on NSScrollView , it works well. But one thing that I notice is that I cannot do horizontal scroll. Is this because the NSCollectionViewFlowLayout that prevents the horizontal scroll (Notice that I use vertical flow)? I did debug the view hierarchy and found out that the zoomed-view was clipped inside NSClipView , vertical scroll works, horizontal not. Any idea? Do I need to create a custom NSCollectionViewFlowLayout to do this?

Answer 1

Try overriding:

@property NSCollectionViewScrollDirection scrollDirection;

on your NSCollectionViewFlowLayout subclass to return NSCollectionViewScrollDirectionHorizontal .