Question

I’m not sure if this is a simulator issue, but I don’t remeber having this problem before when I was using the iPad 5.0 simulator and below (now I’m running iPad 5.1 simulator). I overrode the description method for my Condition object to be:

- (NSString *)description {
    NSString *str = [[NSString alloc] initWithFormat:@"Condition: %@", _conditionName];
    return [str autorelease];
}

I have an array of these objects. My values are all valid. When I do:

for (Condition *p in self.reportsArray) {
    NSLog(@"%@", [p description]);
}

It logs all my values, and then it crashes at the end. When I look at Instruments with Zombies, the last 4 calls are

-[NSPlaceHolderString initWithBytes:length:encoding:]
+[NSString stringWithUTF8String:]
-[NSAutoreleasePool release]
-[NSPlaceholderString initWithFormat:locale:arguments:]

Am I overriding description correctly?

Edit:
In Instruments, I get: message was sent to a deallocated object (zombie) at address:0x8ccf190. On the app itself, I get EXC_BAD_ACCESS.

Answer 1

It seems like the string returned from your description method is being released too soon.

Try rewriting your method using the stringWithFormat: class method.

- (NSString *)description {
    return [NSString stringWithFormat:@"Condition: %@", _conditionName];
}