CODEWITHSUNDEEP
objective-cios
Simon
Simon

Reputation: 25983

How do I find out where a message is being sent from?

Our app is crashing during our tests, sending a message to a deallocated UINavigationItem. I've looked using Instruments, but all the releases and retains look balanced; it looks like something is hanging onto the variable without retaining it. I'd like to find where the message is being sent from, so that I can make sure that the object stays alive long enough to receive it.

The error in the console is:

-[UINavigationItem safeValueForKey:]: message sent to deallocated instance 0x11afab80

The stack trace is:

 0 CoreFoundation ___forwarding___
 1 CoreFoundation _CF_forwarding_prep_0
 2 UIKit -[UINavigationItemButtonViewAccessibility(SafeCategory) accessibilityTraits]
 3 UIAccessibility -[NSObject(NSObjectAccessibility) accessibilityAttributeValue:]
 4 UIAccessibility _copyAttributeValueCallback
 5 AXRuntime _AXXMIGCopyAttributeValue
 6 AXRuntime _XCopyAttributeValue
 7 AXRuntime mshMIGPerform
 8 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
 9 CoreFoundation __CFRunLoopDoSource1
10 CoreFoundation __CFRunLoopRun
11 CoreFoundation CFRunLoopRunSpecific
12 CoreFoundation CFRunLoopRunInMode
13 GraphicsServices GSEventRunModal
14 GraphicsServices GSEventRun
15 UIKit UIApplicationMain
16 MyApp Functional Tests main [myapp]/main.m:14
17 MyApp Functional Tests start

...but none of that is in my code. How do I find out where the message is being sent from?

Upvotes: 3

Views: 547

Answers (1)

Rahul Chavan
Rahul Chavan

Reputation: 510

Use the Command:

Shell malloc_history process_id memory

eg. Shell malloc_history process_id 0x11afab80

Enable Following for the same 1)MallocstackLogging 2) NsDebugEnabled 3)NSZombieEnabled

this will solve the problem

Upvotes: 2

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