iOS CALayerInvalidGeometry

Question

I have an app that is crashing, with this message:

Terminating app due to uncaught exception \'CALayerInvalidGeometry\', reason: \'CALayer position

Answer 1

The problem is between these functions:

8   UIKit        -[UILabel setFrame:] + 233
9   Infectious   -[SusceptibilityHistoryController buildHistogram:] + 9648

You are calling label.frame = ..., and probably calculating the value somehow and the result is a NaN, which means "not a number" and, as you correctly suggested, it can be the result of o divide-by-zero operation. But it can appear for a lot other reasons: http://en.wikipedia.org/wiki/NaN

Go through the function called "buildHistogram:", find the call to either "setFrame" or ".frame = " and find how can the computed position become NaN. If there is a division involved, it will probably be a division by zero.