On Sep 24, 2016, at 21:07 , Patrick J. Collins <[email protected]>
wrote:
>
> I tried doing:
>
> for (int i = 0; i < frames; i++) {
> __weak MyClass *weakMyClass = myClass;
> [weakMyClass prepareAudio];
> ((int16_t *)audio->mBuffers[0].mData)[i] =
> myClass->_buffer[myClass->_index];
> }
>
> But that made no difference…
As a side issue, the above really will make no difference. However, since ARC
is also going to retain “myClass” when you assign “channel” to it, the dance
with the weak variable doesn’t do anything. Also, using a weak variable as the
receiver of the “prepareAudio” method doesn’t help, because ARC retains the
object around the method invocation anyway.
> Can anyone tell me how in the world this weak reference is becoming strong?
There’s no such thing as a weak reference or a strong reference, there are only
weak and strong variables (and therefore properties). So, weak references can’t
“become” strong. Since your “delegate” property is weak, your delegate would
disappear immediately on assignment to it, unless it is being kept alive by
some other object. AFAICT, you haven’t given us any information about the
actual owner of the delegate.
> The other thing that's really weird is, since passing in nil as a delegate
> makes the memory leak go away, I thought I could just do:
>
> -(void)prepareAudio {
> // stuff
> if ([self isDone]) {
> [self.delegate didFinish];
> self.delegate = nil;
> }
> // more stuff
> }
>
> But that doesn't work either! The main object still never deallocates..
So, there is a retain cycle between the delegate and (presumably) the object
that’s keeping it alive. If the above is the only call to the delegate, then it
looks like the “didFinish” method is creating a retain cycle. Otherwise, some
other code in the delegate (that actually executes) is causing the cycle. _______________________________________________
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