Crash in drawRect - what causes it?

objective-c macos

* Terminating app due to uncaught exception 'NSRangeException', reason: '*

[NSConcreteTextStorage attribute:atIndex:longestEffectiveRange:inRange:]: Range or index out of bounds'

It is clearly a NSRange exception, as O' y said

objective-c macos

I think you need add assert function to check the "range"

NSRange range = [val rangeValue];

make sure range will not be NSNotFound.

CodeHunter