Fwd: Getting notified when visible contents of a UIWebView has changed
Fwd: Getting notified when visible contents of a UIWebView has changed
- Subject: Fwd: Getting notified when visible contents of a UIWebView has changed
- From: Motti Shneor <email@hidden>
- Date: Thu, 04 Apr 2013 10:52:41 +0300
Hello everyone, and please forgive a newcomer's question.
I need to observe the visible contents of a UIWebView, rendered in my iOS application, and each time the visible contents changes, I need to extract the contents, and transmit it to our server. A bit like screen-sharing on the Mac, but not for the whole screen contents, just a single view.
I started looking for the right delegate call, and found the differences between MacOS and iOS confusing me.
I DO NOT need to re-transmit just because the user rotated his iOS device and the view rotated. but I DO want to re-transmit when the user pinches to zoom in and out, or scrolls the view. I do not want the whole contents transmitted. just the visible part of it.
The contents of this UIWebView might have sub-view's I'm not aware of, and it may be rendering a URL to some file (PDF or other).
I already know how to extract the image-buffer out of the CALAyer's context and I can set up a timer to do this N times a second.
However, I'd like to avoid transmitting anything when the view is still, and I want to avoid frame-differencing 30 times a second to do this.
The "right" way for me, would be to get notified when the UIWebView decides to re-display (or redraw?) its contents after some manipulation (drawing, zooming, rotating, animating etc.).
Can anyone hint on where to start here?
Thanks.
Motti Shneor.
Motti Shneor
e-mail: email@hidden
phone: +972-8-9267730
mobile: +972-54-3136621
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