I know there are MANY threads that discuss this issue and trust me, I have looked at each and every one of them but none of them solved my issue.
Anyway, in my app I am receiving a message sent to deallocated instance crash. The object address follows that message and I have tried to use instruments without any success.
What I would like to do is how do I properly debug and fix this issue with the latest Xcode (4.4.1). What I would like to know is which line the app crashed on. That way, I can just focus on that one object so I can make sure it is allocated.
Does anyone know how I can do this with the latest Xcode?
Thanks!
Enable zombie. It should tell you when your code try to send message to deallocated object instance. Problem is you are using a object after it has been released. It could be autoreleased object or object you explicitly released and using after etc. Below image is the screenshot from XCode when you do "Edit Scheme"
Setting an exception breakpoint can sometimes help to zero in on the specific line of your code that is causing a problem. This Apple doc shows you how.
Related
I'm getting this error exc_bad_access code=1 address= xcodein my IOS app so I've tried to use the zombie tool like this :
Product->Profile->Zombies then I click on start recording (the red dot)
Also I've check the Enable Zombie Objects in
Product->Scheme->Edit scheme->Run->Diagnostics
The problem is when I'm using the zombie mode and I try to simulate the error, the error is not simulated, not detected. When I run my project in normal mode, debug, the error occurs and the app crash.
So what I've missed here ?
Note this is the first time I use the zombie tools. Thanks.
Update
Error :
The problem with NSZombie here is that it keeps objects alive instead of deallocating them, but turns them into special objects that complain as soon as you try to call a method on them.
However, if you have some code like a block that just tries to access an instance variable (without calling a method on that object), this will now succeed as the object's memory region is now still available.
If you haven't done so already, simply try running your code in the normal debugger without NSZombie as that should tell you where the crash happens in the stack trace.
I am developing the application for over 6 month.
After everithing was developed and tested, I put app aside for 2 weeks and now when I run it it start crashing without any warning:
Even if I hit Continue Execution over 20 times still nothing in log.
I have all exceptions break point and malloc_errer_break set.
App crash when I move from screen to screen (When I open 2 screen or when I close it).
Most of the time EXC_BAD_ACCESS happens when you use an object that no longer exists.
You could check for Zombies during run-time to see if you use any of your object which doesn't exist anymore.
Let me guess - you need to change a property to strong (from weak). Name of that problematic property you will find in the console after enabling check for zombies (press ⌘⇧< then check Enable Zombie Objects in Diagnostics/Memory Management)
This a very generic error, I suggest to review your code and try again and as Anc Ainu said the reason is of using an object thats no longer exists.
I recommend to set up Exception breakpoint to get place from
which your app crashes.
To make this breakpoint enabled go to breakpoint tab, then tap on plus button and choose 'Add Exception Breakpoint'.
2. And yes, enabling NSZombies also could help
you.
I have crash in my project. I use MKMapView and sometimes it crashes in addAnnotation(s) method.
I get message from XCode that crash stating
method _insert(objc_object*, MKQuadTrieNode*, MKQuadTrie*)
Please, help me.
please see the below image
P.S. Crash is reproduced not always. It is reproduced after 100+ annotations, sometimes after 300 or 500+. This objects are returns from server and I check coordinate for it.
Enable Zombies in your project.
Press CMD+< and select Enable Zombie Object in Diagnostic tab.
Now your are able to see what's wrong.
hope this help.
I received a crash. What is the reason of this crash?
Most likely your delegate object was deallocated and you're trying to send message to deallocated instance. Running your app with zombies enabled may help to diagnose that issue.
To enable zombies go to Product/Edit scheme in menu and check "Enable Zombie Objects" checkbox:
i have met this problem . maybe your controller is destroied which contains the delegate. you will set the delegate=nil when your controller release. for example :write this :self.delegate=nil; int the -(void)delloc method of controller
It seems that NSZombie can only be enabled in the instruments if the program is on the simulator.
I did NSZombie on Xcode and it tells me that this message sent to the deallocated instance happens in my video taking class, which is not supported on the simulator. Therefore I am unable to trace the instance which has been deallocated...
Is there any ideas in which i can find out which instance is being deallocated when I must use the device to make it happen? I'm using iOS5 with ARC..
Thank you so much in advance.
Guys this is really help full tool login install and use as per instruction this tool gives exact line no where there is error its been used in my organization http://www.crashlytics.com/