将BOOL *传递给ALAssetsLibrary

Question

Hi I need to pass a BOOL to the

ALAssetsLibrary 
- (void)enumerateGroupsWithTypes:(ALAssetsGroupType)types usingBlock:(ALAssetsLibraryGroupsEnumerationResultsBlock)enumerationBlock failureBlock:(ALAssetsLibraryAccessFailureBlock)failureBlock

enumeration block it has the following signature.

^( ALAssetsGroup *group, BOOL *stop )

and the documentation says:

Stop:: A pointer to a boolean value; set the value to YES to stop enumeration.

However if I try setting the value to

stop = YES

I get the following warning and the enumeration just continues.

Initialization makes pointer from integer without cast

So my question is how do i pass a boolean as a pointer to the stop parameter?

Any help would be much appreciated.

Answer 1

As you said, stop is a pointer to a BOOL value. To assign a value to the memory location stop is pointing at, you have to dereference the pointer with the * operator. Like this:

*stop = YES;