How to enable NSZombie in Xcode?
XcodeNszombieXcode Problem Overview
I have an app that is crashing with no error tracing. I can see part of what is going on if I debug, but can't figure out which object is "zombie-ing".
Does anybody know how to enable NSZombie in Xcode 4?
Xcode Solutions
Solution 1 - Xcode
Environment variables are now part of the "scheme".
To edit the scheme and turn on zombies:
-
In the "Product" menu, select "Edit Scheme".
-
Go to the "Run Foo.app" stage in the left panel, and the "Arguments" tab on the right.
-
Add
NSZombieEnabled
to the "Environment Variables" section and set the value toYES
, as you could in Xcode 3.
In Xcode 4.1 and above, there's also a checkbox on the "Diagnostics" tab of the "Run" stage to "Enable Zombie Objects".
With Xcode 6.4:
Solution 2 - Xcode
I encountered the same problem with troubleshooting EXC_BAD_ACCESS and had hard time to find the setting with Xcode 4.2 (the latest one that comes with iOS5 SDK). Apple keeps on moving things and the settings are no longer where they used to be.
Fortunately, I've found it and it works for the device, not just Simulator. You need to open the Product menu in the Xcode, select Edit scheme and then choose the Diagnostics tab. There you have "Enable Zombie Objects". Once selected and run in debugger will point you to the double released object! Enjoy!
In short
Product->Edit Scheme->Diagnostics-> Click Enable Zombie Objects
Solution 3 - Xcode
Product > Profile will launch Instruments and then you there should be a "Trace Template" named "Zombies". However this trace template is only available if the current build destination is the simulator - it will not be available if you have the destination set to your iOS device.
Also another thing to note is that there is no actual Zombies instrument in the instrument library. The zombies trace template actually consists of the Allocations instrument with the "Enable NSZombie detection" launch configuration set.
Solution 4 - Xcode
It's a simple matter of setting an environment variable on your executable (NSZombieEnabled = YES)
, and then running/debugging your app as normal.If you message a zombie, your app will crash/break to debugger and NSLog
a message for you.
For more information, check out this CocoaDev page: <http://www.cocoadev.com/index.pl?NSZombieEnabled>
Also, this process will become much easier with the release of 10.6 and the next versions of Xcode and Instruments. Just saying'. =)
Solution 5 - Xcode
Product > Profile will pop up Instruments. Select zombies from the panel and go nuts.
Solution 6 - Xcode
Go to Product - Scheme - edit scheme - Arguments - Environment Variables set NSZombieEnabled = YES
Solution 7 - Xcode
In xcode 4.2
Goto, Product -> edit scheme -> click Run yourappname.app -> Diagonostics -> Enable Zombie object.
Solution 8 - Xcode
Here's a video and explaination how to use Instruments and NSZombie to find and fix memory crashes on iOS: http://www.markj.net/iphone-memory-debug-nszombie/
Solution 9 - Xcode
As of Xcode 3.2.5 and Snow Leopard (Mac OS X 10.6), you can run your code through the Zombies instrument: Run > Run with Performance Tool > Zombies
. That allows you to see particular objects and their retain counts on a timeline.
Solution 10 - Xcode
In Xcode 4.5.2 goto Product -> Edit Scheme -> and Under the Diagnostics tab check the check box in between Objective C and Enable Zombie Objects and Click on OK
Solution 11 - Xcode
To enable Zombie logging double-click the executable in the executables group of your Xcode project. At this point click the Arguments tab and in the Variables to be set in the environment:
section, make a variable called NSZombieEnabled
and set its value to YES
.
Solution 12 - Xcode
In XCode 4.0: To detect NSZombie in Instruments, select the Simulator as your target (can't detect NSZomboe on device). Run Instruments (CMD+I) and select "Zombies" trace template. Enjoy.
Solution 13 - Xcode
In the preferences of your executable add the environment variable NSZombieEnabled
and set the value to YES
.
Solution 14 - Xcode
in ur XCODE (4.3) next the play button :) (run)
select : edit scheme
the scheme management window will open
click on the Arguments tab
you should see : 1- Arguments passed on launch 2- environment variables
inside the the (2- environment variables) place
Name: NSZombieEnabled
Value: YES
And its done....
Solution 15 - Xcode
NSZombieEnabled is used for Debugging BAD_ACCESS,
enable the NSZombiesEnabled environment variable from Xcode’s schemes sheet.
Click on Product⇒Edit Scheme to open the sheet and set the Enable Zombie Objects check box
this video will help you to see what i'm trying to say.