I'm developing a custom keyboard but it's very slow and sometimes it's crashing.
Because I'm not sure where it comes from, I'd like to Time Profiler with Instruments. But when I select MyIphone > Keyboard Extension (target), I get:
Target failed to run
or
Waiting for x.x.x.Keyboard
Please take appropriate action to initiate the launch of 'x.x.x.Keyboard.'
Is it even possible to use Instruments with an app extension? If yes, how should I proceed?