ios - CGAffineTransformInvert: singular matrix

Question

I've been occasionally seeing the error message:

CGAffineTransformInvert: singular matrix

In the logging area of Xcode. This seems to occur (infrequently, fortunately) when I pinch to resize a web site within a UIWebView. [Commercial website, not my own.] Since I do no Affine Transformations in my App, I'm wondering if this might be a bug/feature of UIWebView. If so, can I ignore it, since it doesn't seem to be interfering with anything?

Answer 1

From looking around at other posts, it appears you'll get this message if you try and set the zoom scale to zero. Would be useful to NSLog the scale value when you pinch and see if it gets to zero (and occurs at the same time as the affine transform error).