On Aug 15, 2013, at 9:49 AM, Jens Alfke wrote:
> 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();
>> }];
>
> 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.
>
> 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.
When a block gets copied, it copies any blocks it has captured. So, the fact
that the completion block is copied by the framework code is sufficient.
https://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxVariables.html#//apple_ref/doc/uid/TP40007502-CH6-SW7
Regards,
Ken
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