I'm turning on ARC for a project (yay) and have run into a problem I can't wrap my head
around. It always worked fine before ARC. When I turn zombies on, doing "memory
history 0x610004279ac0" can't find it in the history. Here's the method and the call
to it:
-(void) doStuff:(NSString**)fillMeIn
{
[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL* stop) {
if(obj.flag) {
*stop = YES;
*fillMeIn = @"wow";
}
}];
}
NSString* getFilledIn;
[thing doStuff:&getFilledIn];
The call to doStuff: results in EXC_BAD_ACCESS, or "*** -[CFString retain]: message
sent to deallocated instance 0x610004279ac0" if I turn zombies on.
I tried changing the param type to (NSString** _Nonnull), thinking it was
confused about my knowing that the reference will never be nil, but it didn't
help. Then I got to thinking about the reference being assigned inside the
block and changed it to:
-(void) doStuff:(NSString** _Nonnull)fillMeIn
{
__block NSString* noFillMeIn;
[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL* stop) {
if(obj.flag) {
*stop = YES;
*noFillMeIn = @"wow";
}
}];
*fillMeIn = noFillMeIn;
}
That seems to fix it. Is there a better way to deref and assign to the param
from within the block?
Sent from iCloud's ridiculous UI, so, sorry about the formatting
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