> As I said before, this is a bug in your code. ‘block’ needs to be copied
> since it is going to be called after the calling function returns.
I work under ARC. It goes to heap automatically.
Also, there are some circumstances that proves your wrong guess:
1. If I copy it manually, it still gets NULLified.
2. If there are some items in the collection view, it works as expected, no
explicit copy needed.
So it seems for me like a bug in the ARC/runtime or in the collection view
(unlikely).
Vlad.
15 авг. 2013 г., в 18:49, Jens Alfke <j...@mooseyard.com> написал(а):
>
> On Aug 15, 2013, at 5:41 AM, Vlad Alekseev <ippo...@me.com> wrote:
>
>> dispatch_block_t block = ^{
>> printf("finished");
>> };
>>
>> UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout
>> *)self.collectionView.collectionViewLayout;
>> [self.collectionView performBatchUpdates:^{
>> layout.minimumInteritemSpacing = 20;
>> } completion:^(BOOL finished) {
>> block();
>> }];
>
>
> Yes, the collection view copies the completion block you pass it. But that
> block is not ‘block’, it’s the inline block literal that calls ‘block’. That
> gets copied, but when that is called it still tries to call the uncopied
> ‘block’, which fails.
>
> —Jens
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