Callbacks When an NSScrollView is Scrolled?

问:

I'm making a Mac app which needs to know when the user is scrolling the NSScrollView, however, I can't find any methods like UIScrollView, which has the following delegate methods:

 scrollViewDidScroll:  scrollViewWillBeginDragging:  scrollViewDidEndDragging:willDecelerate:  scrollViewShouldScrollToTop:  scrollViewDidScrollToTop:  scrollViewWillBeginDecelerating:  scrollViewDidEndDecelerating: 

Can I have the similar delegate methods for the App Kit? Thanks in advance.


答:

You can monitor a scroll view's changes by monitoring the bounds of it's content view. First set the content view to post its changes with

[contentView setPostsBoundsChangedNotifications:YES]; 

Then register as an observer of those notifications with

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(boundsDidChange:) name:NSViewBoundsDidChangeNotification object:contentView]; 

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