Re: Third time I ask - please help. How to trace visible change in a UIView (UIWebView)
Re: Third time I ask - please help. How to trace visible change in a UIView (UIWebView)
- Subject: Re: Third time I ask - please help. How to trace visible change in a UIView (UIWebView)
- From: Motti Shneor <email@hidden>
- Date: Tue, 23 Apr 2013 10:05:23 +0300
OK!!!! Thanks Marco. Thad did the trick!!!
As I was suspecting, my "Mac" mind was hiding the solution from me. I didn't guess that the UIWebView had its own internal UIScrollView to support all the navigation gestures (scroll, zoom, rotate, translate etc.)
On the Mac, usually a view is usually just a view, and if you want to scroll it, you'd need to embed it into a scroll-view yourself, and manage the interaction.
I tried it now , and it works perfect for my needs. Also, I get a first delegate call "loaded" from the UIWebView itself, when the content is first rendered completely -- so I take a first snapshot there, and ignore any "scrolling" events beforehand. I also limit my snapshots to N times a second (in case I receive very frequent "scrolling" events) and this further provides the efficiency I need.
I seem to have a loose end though --- when I examine the UIWebView's scrollView property, it initially has a non-nil delegate. I don't know if I should "pose" as delegate and after taking my snapshot, call the original delegate, or only set myself as a delegate instead of the original. Any ideas?
On 22 באפר 2013, at 16:08, Marco Tabini wrote:
>
> On 2013-04-22, at 9:04 AM, Motti Shneor <email@hidden> wrote:
>
>> To be very precise --- I'd like to know how to be notified about ANY UIView visual change. It somehow seems very obvious to me that such "delegate call" must exist. Maybe I'm overlooking something very basic here.
>
> I think I had completely misunderstood what you wanted to do! I think what you want to do is interpose yourself as the delegate of the UIWebView's UIScrollView instance (accessible through the -scrollview property); that lets you track changes in scroll position, zoom level, etc. Is that what you meant?
>
>
> —Mt.
>
Motti Shneor,
CEO, suMac LTD.
Software Development for the Macintosh
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