Ask the user to send crash log after crash on iPhone

Some application ask the user if th开发者_开发百科ey want to send the crash log by email when they restart after a crash. How are they doing that ?

They have to record the log when they crashing and reads this file and ask the user to send it if it's not empty ?

Is there a framework or an open source project I can integrate to do this ?

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Check out Crittercism (www.crittercism.com), I've been using it for feedback and crash reporting for my ios and android apps.

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Have a look at PLCrashReporter.

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Here is one although I have not used it so I can not give an opinion on how well it works. Crashkit