Xcode: debug unexpected iOS app crashes

Question

I'm facing unexpected crashes of my app running on an iPhone 4 with iOS 5.0.1, the app crash without generating any error message nor crash log. I did also enabled zombies and tested with Instruments with no luck... how can I figure out where is the problem? I'm totally stuck :(

ps. I'm using ARC and my app is multi thread (NSOpertations + GCD)

There are some hints for catching the failure in [this thread](http://stackoverflow.com/questions/8100054/no-exception-stack-trace-in-console-under-xcode-4-2-ios-5). — Hot Licks, Feb 05 '12 at 15:21
thanks, could you please post your comment as an answer so I can accept it? :) — daveoncode, Feb 06 '12 at 13:17

score 3 · Accepted Answer · edited May 23 '17 at 11:52

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(By popular demand:) There are some hints for catching the failure in this thread.

edited May 23 '17 at 11:52

Community

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answered Feb 06 '12 at 16:08

Hot Licks

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score 2 · Answer 2 · answered Feb 05 '12 at 15:16

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From the breakpoint-menu in Xcode, press the little '+' button at your window bottom left, and add an exception breakpoint. It will give you a heads up if the app throws an exception due to erroneous code.

answered Feb 05 '12 at 15:16

Audun Kjelstrup

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score 1 · Answer 3 · edited Jun 28 '16 at 13:43

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Just follow this url you will get trick to track the causes of crash.

edited Jun 28 '16 at 13:43

fpg1503

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answered Jul 16 '15 at 18:14

suraj Gupta

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Try not inserting links to an answer outside SE as they may stop working. Answers should be mostly self-contained. – fpg1503 Jun 28 '16 at 13:45

score -1 · Answer 4 · answered Feb 05 '12 at 15:13

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add some breakpoint before crashing point and add a lot of NSAssert to check your assertion.

answered Feb 05 '12 at 15:13

Xcode: debug unexpected iOS app crashes

4 Answers4