Unable to find Zombie in Instruments for device

Question

Unable to find Zombie in Instruments for device .

I am able to find Zombie in Instruments for Simulator but not able to find for device , my app only run on device due to addition of third party api.

How can i trace cause of crash due to "message sent to deallocated instance "

I just want to find exact instance(or line of code) which is causing this crash.

You cant check zombies in device.http://stackoverflow.com/questions/10564018/zombie-option-missing-from-both-diagnostics-and-instruments — Ganapathy, Sep 06 '13 at 07:05
but they are saying that i have to use simulator not device but my app only works on device — abhishekkharwar, Sep 06 '13 at 07:06
Yes. Use exception break point and try to simulate that crash. Me too felt that kind of issues. But u don't have other option. — Ganapathy, Sep 06 '13 at 07:09
Do u known in which screen its getting crash? in the sense can u simulate the crash ? — Ganapathy, Sep 06 '13 at 07:10
Fine. How its getting crash? while performing some action or some thing else? — Ganapathy, Sep 06 '13 at 07:12

score 0 · Answer 1 · answered Sep 06 '13 at 07:06

0

Although, when XCode returns "Message sent to deallocated instance" error message, it normally tells the Object as well which is sending that error.
Anyway, you can use the below to find the exact line which is causing you the error:

Use Exception BreakPoint for All Exceptions in XCode.
To Add an Exception Breakpoint:
1. Go to BreakPoint Navigator
2. At the bottom there is a plus symbol. Click it.
3. You will get two options: Add Exception Breakpoint... and Add Symbolic BreakPoint...
Choose Exception Breakpoint.

answered Sep 06 '13 at 07:06

Puneet Sharma

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i have enabled all exceptions breakpoint but in this case that is not working. – abhishekkharwar Sep 06 '13 at 07:07
Some times it may happen. Exception break point cant help in some cases. – Ganapathy Sep 06 '13 at 07:11

score 0 · Answer 2 · edited Sep 06 '13 at 07:44

Some reasons for zombies crash:
1. Control delegate response late after the control instance is cleared.
2. Instance used inside the thread try to modify the instance after its get cleared.

So handle the delegate properly

Make control delegates to nil while removing view controller like this:

- (void)viewDidDisappear:(BOOL)animated
{
    [self.mapView setDelegate:nil];
    [_webView setDelegate:nil];
}

Unable to find Zombie in Instruments for device

2 Answers2