How do I set up NSZombieEnabled in Xcode 4

Question

How do I set up NSZombieEnabled and CFZombieLevel for my executable in Xcode 4

User · Accepted Answer

In Xcode 4 x press     R   or click Menubar   Product   Scheme   Edit Scheme    select the  Diagnostics  tab and click  Enable Zombie Objects        This turns released objects into NSZombie instances that print console warnings when used again  This is a debugging aid that increases memory use  no object is really released  but improves error reporting    A typical case is when you over-release an object and you don t know which one    With zombies  - UITableView release   message sent to deallocated instance   Without zombies       This Xcode setting is ignored when you archive the application for App Store submission  You don t need to touch anything before releasing your application    Pressing   R is the same as selecting Product   Run while keeping the Alt key pressed  Clicking the  Enable Zombie Objects  checkbox is the same as manually adding  NSZombieEnabled   YES  in the section  Environment Variables  of the tab Arguments

User · Answer

Jano s answer is the easiest way to find it   another way would be if you click on the scheme drop down bar -  edit scheme -  arguments tab and then add NSZombieEnabled in the Environment Variables column and YES in the value column

User · Answer

I find this alternative more convenient    Click the  Run Button Dropdown  From the list choose Profile The program  Instruments  should open where you can also choose Zombies Now you can interact with your app and try to cause the error As soon as the error happens you should get a hint on when your object was released and therefore deallocated      As soon as a zombie is detected you then get a neat  Zombie Stack  that shows you when the object in question was allocated and where it was retained or released   Event Type    RefCt     Responsible Caller Malloc            1     - MyViewController loadData   Retain            2     - MyDataManager initWithBaseURL   Release           1     - MyDataManager initWithBaseURL   Release           0     - MyViewController loadData   Zombie           -1     - MyService prepareURLReuqest    Advantages compared to using the diagnostic tab of the Xcode Schemes    If you forget to uncheck the option in the diagnostic tab there no objects will be released from memory  You get a more detailed stack that shows you in what methods your corrupt object was allocated   released or retained

User · Answer

On In Xcode 7    lt   or select Edit Scheme from Product   Scheme Menu   select Enable Zombie Objects form the Diagnostics tab    As alternative  if you prefer  xcconfig files you can read this article https   therealbnut wordpress com 2012 01 01 setting-xcode-4-0-environment-variables-from-a-script

User · Answer

Cocoa offers a cool feature which greatly enhances your capabilities to debug such situations  It is an environment variable which is called NSZombieEnabled  watch this video  that explains setting up NSZombieEnabled in objective-C

User · Answer

In Xcode 4 2   Project Name Edit Scheme Diagnostics  Enable Zombie Objects check box  You re done

User · Answer

In Xcode   4 3   You click on the scheme drop down bar -  edit scheme -  arguments tab and then add NSZombieEnabled in the Environment Variables column and YES in the value column   Good Luck

[objective-c] How do I set up NSZombieEnabled in Xcode 4?

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