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Re: Keeping Scroll Views in Sync
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Re: Keeping Scroll Views in Sync


  • Subject: Re: Keeping Scroll Views in Sync
  • From: Tamas Nagy <email@hidden>
  • Date: Wed, 09 Oct 2013 15:52:30 +0200

Hi,

in one of my apps I'm doing this too, but without any problems. I'm using scrollToPoint: method instead.

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

…


-(void)viewScrolled:(NSNotification *)notification {


    if ([[notification object] isEqualTo:[[self timelineViewScrollView] contentView]]) {


        [[[self trackHelperViewScrollView] contentView] scrollToPoint:NSMakePoint([[[self trackHelperViewScrollView] contentView] bounds].origin.x, [[[self timelineViewScrollView] contentView] bounds].origin.y)];

        [[[self markerViewScrollView] contentView] scrollToPoint:NSMakePoint([[[self timelineViewScrollView] contentView] bounds].origin.x, [[[self markerViewScrollView] contentView] bounds].origin.y)];


    } else

.
.
.
.

Cheers,
Tamas

On Oct 9, 2013, at 3:44 PM, Dave <email@hidden> wrote:

> Hi,
>
> I've got a number of scroll views (A, B and C) I'm trying to keep in sync with each other, e.g. if the user scrolls A then I want B and C to scroll in sync with it. I've got this working by adding code in the scrollViewDidScroll method that passes the contentOffset onto the other two scroll views.
>
> This works ok, but it is judders a bit and flickers when scrolling quickly.
>
> This is the code:
>
> - (void) scrollViewDidScroll:(LTWScrollView*) theScrollView
> {
> if (theScrollView.tag == kScrollViewA)
> 	{
> 	self.scrollViewB.contentOffset = theScrollView.contentOffset;
> 	self.scrollViewC.contentOffset = theScrollView.contentOffset;
> 	}
>
> else if (theScrollView.tag == kScrollViewB)
> 	{
> 	self.scrollViewA.contentOffset = theScrollView.contentOffset;
> 	self.scrollViewC.contentOffset = theScrollView.contentOffset;
> 	}
> else if (theScrollView.tag == kScrollViewC)
> 	{
> 	self.scrollViewA.contentOffset = theScrollView.contentOffset;
> 	self.scrollViewB.contentOffset = theScrollView.contentOffset;
> 	}
> }
>
> I've tried a few things, but nothing seem to make a difference.
>
> Any ideas anyone?
>
> Thanks a lot
> Dave
>
>
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