Cocoa: hide custom scroller of textview on application startup

Question

I've created a custom scroller for my textview (initiating it in the awakeFromNib method of the scrollview) and now I want to let the user chose if he wants to show the scrollbar on application startup. The problem is that the scroller always appears even if I hide it immediately after I created it and set it to be the scroller of the scrollview. The weird thing is that trying to hide the scroller after an event has been triggered (for example by clicking on a checkbox in the preferences) the scroller properly hides and shows. What I'm I doing wrong? Any help is appreciated!

Answer 1

The weird thing is that before adding the custom scroller to the scrollview I have to use setHasVerticalScroller:YES, otherwise I can't scroll using the two-fingers scroll gesture. Then, if the user doesn't want the scrollbar to be shown I have to use setHasVerticalScroller:NO in the document's windowControllerDidLoadNib method, using it just after having added the scrollbar in the scrollview's awakeFromNib method won't work. Well, at least now it seems to work!

Answer 2

I've always used IB to set up scrollbars and then used the following line if I want to suppress one of them:

[self.aScrollView setHasHorizontalScroller:NO]; // so only the vertical scrollbar is active

Try using that line in awakeFromNib, later setting it to YES if user chooses, rather than using the "hidden" property.

P.S. An NSTextView added in IB is always embedded in an NSScrollView, and it's the scrollview that governs the scrollbars. So if the above doesn't work, try calling setHasWhateverScroller on the superview of your textview:

[[[aTextView superview] superview] setHasHorizontalScroller:NO];

If you get an "unrecognized selector" error, then try explicitly casting the superview to NSScrollView (which will work only if the superview really is an instance of NSScrollView):

[(NSScrollView *)[[aTextView superview] superview] setHasHorizontalScroller:NO];