I want a object to follow the edge of a splitView when the splitView is resized,

but when i subclass and override mouseDragged or mouseMoved nothing happends,

what do i have to do?

It sounds like you just need to set autosizing in Interface Builder. Or am I misunderstanding you?

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Try RBSplitView if you haven’t already.

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Or am I misunderstanding you?

Autosizing didnt work out the way i wanted.

Try RBSplitView - I will try it:)

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splitview has a delegate method

splitView:resizeSubviewsWithOldSize:

it gets called after the splitview is resized, and it allows you to manually resize your subVeiws at the appropriate time.

this is all you should need to manually setup a subView, but splitview Is also very flexible through the delegate methods, I suggest looking up NSSplitView in the documentation, where all of the delegate methods and Notifications are described in detail.