PHImageManager crashing after many image requests

Question

I'm trying to grab all of the users PHAsset with PHAssetMediaTypeImage and then iterate through them, getting the corresponding UIImages one at a time. I have about 2k photos on my iPhone 5 and this code crashes after iterating through 587 of them.

PHFetchResult *fr = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];

PHImageManager *manager = [PHImageManager defaultManager];
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.synchronous = YES;
__block int i = 0;
for (PHAsset *result in fr)
{

    [manager requestImageForAsset:result targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeAspectFill options:options resultHandler:^(UIImage *image, NSDictionary *info) {
        NSLog(@"%d", i);
        i++;
    }];
}

The exception reads EXC_BAD_ACCESS (code=1, address=0x0). Any help pointing me in the right direction on this will be enormously appreciated.

Answer 1

Closing the loop on this one. The images don't get released until the for loop completes so you need to put an @autoreleasepool to drain the pool after each iteration of the loop, like so

PHFetchResult *fr = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];
PHImageManager *manager = [PHImageManager defaultManager];
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.synchronous = YES;
__block int i = 0;
for (PHAsset *result in fr)
{
    @autoreleasepool {
    [manager requestImageForAsset:result targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeAspectFill options:options resultHandler:^(UIImage *image, NSDictionary *info) {
            NSLog(@"%d", i);
            i++;
        }];
    }
}