Search code examples
iphoneobjective-cmemory-managementautomatic-ref-countingnszombie

Zombie in mixed ARC code

I am using a non-ARC framework in my ARC-enabled app. Now I get a weird EXC_BAD_ACCESS at a line that looks like this:

return [super prepareURLRequest];  << Thread 1: Program received signal: "EXC_BAD_ACCESS".

First of all, how is this possible, since super is not an object that could possibly have been deallocated. Update: Although the Debugger got stuck at this line, it turned out that the problem was one level deeper in the mentioned method.

When I run the thing in Zombie mode I get the following "zombie stack":

Event Type    RefCt     Responsible Caller
Malloc            1     -[MyViewController loadData:]
Retain            2     -[MyDataManager initWithBaseURL:]
Release           1     -[MyDataManager initWithBaseURL:]
Release           0     -[MyViewController loadData:]
Zombie           -1     -[RKRequest prepareURLReuqest]

It seems that there is a problem with the url but in ARC I have no means of retaining the URL so that it does not get allocated. So how could I fix this problem.

Solution

  • Okay, I found the problem. The problem was that MyDataManager was deallocated after the loadData: method was through.

    So I added a myDataManager property to MyViewController and the problem disappeared.