I'm aware of the fact that you should use weakSelf in block that may survive yourself to avoid retain memory cycle. like:
__weak id weakSelf = self;
self.block = ^{
[weakSelf something];
}
But I'm trying to find a generic way. I could use a macro like:
#define Weakify(o) __weak __typeof__((__typeof__(o))o)
#define WeakifySelf(o) Weakify(self) o = self;
WeakifySelf(weakSelf)
self.block = ^{
[weakSelf something];
}
Which simplify, but I wonder why I can't use an ivar on my viewController.
@interface YDViewController : UIViewController
{
__weak id _weakSelf;
}
and then use this iVar
self.block = ^{
[_weakSelf something];
}
Any idea?
The issue that sinks this idea is that [_weakSelf something]
is, under the hood, exactly the same as [self->_weakSelf something]
.
So even though you're trying to use a weak reference, you end up using the strong reference to get to the weak reference and capturing both.
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