ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if (*stop) {
return ;
}
// TODO : access granted
*stop = TRUE;
} failureBlock:^(NSError *error) {
// TODO: User denied access. Tell them we can't do anything.
}];