Editing PHAsset crash - ios

Question

Based on this code from SamplePhotosApp:
- (void)applyFilterWithName:(NSString *)filterName {
PHContentEditingInputRequestOptions *options = [[PHContentEditingInputRequestOptions alloc] init];
[options setCanHandleAdjustmentData:^BOOL(PHAdjustmentData *adjustmentData) {
return [adjustmentData.formatIdentifier isEqualToString:AdjustmentFormatIdentifier] && [adjustmentData.formatVersion isEqualToString:#"1.0"];
}];
[self.asset requestContentEditingInputWithOptions:options completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
NSURL *url = [contentEditingInput fullSizeImageURL];
int orientation = [contentEditingInput fullSizeImageOrientation];
CIImage *inputImage = [CIImage imageWithContentsOfURL:url options:nil];
inputImage = [inputImage imageByApplyingOrientation:orientation];
// Add filter
CIFilter *filter = [CIFilter filterWithName:filterName];
[filter setDefaults];
[filter setValue:inputImage forKey:kCIInputImageKey];
CIImage *outputImage = [filter outputImage];
// Create editing output
NSData *jpegData = [outputImage aapl_jpegRepresentationWithCompressionQuality:0.9f];
PHAdjustmentData *adjustmentData = [[PHAdjustmentData alloc] initWithFormatIdentifier:AdjustmentFormatIdentifier formatVersion:#"1.0" data:[filterName dataUsingEncoding:NSUTF8StringEncoding]];
PHContentEditingOutput *contentEditingOutput = [[PHContentEditingOutput alloc] initWithContentEditingInput:contentEditingInput];
[jpegData writeToURL:[contentEditingOutput renderedContentURL] atomically:YES];
[contentEditingOutput setAdjustmentData:adjustmentData];
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *request = [PHAssetChangeRequest changeRequestForAsset:self.asset];
request.contentEditingOutput = contentEditingOutput;
} completionHandler:^(BOOL success, NSError *error) {
if (!success) {
NSLog(#"Error: %#", error);
}
}];
}];
}
I have created my own implementation of applying filters to images. My code:
- (void)saveAsset:(PHAsset *)asset withEdits:(NSDictionary *)edits withCompletion:(successBlock)block {
PHContentEditingInputRequestOptions *options = [[PHContentEditingInputRequestOptions alloc] init];
[options setCanHandleAdjustmentData:^BOOL(PHAdjustmentData *adjustmentData) {
return [adjustmentData.formatIdentifier isEqualToString:#"myID"] && [adjustmentData.formatVersion isEqualToString:#"1.0"];
}];
[asset requestContentEditingInputWithOptions:options completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
NSURL *fullImageURL = [contentEditingInput fullSizeImageURL];
UIImage *fullSizeImage = [UIImage imageWithContentsOfFile:[fullImageURL path]];
UIImage *editedImage = [EngineImageFilters applyEffects:edits[#"filters"] toImages:#[fullSizeImage] withValue:#(ImageFilterValueTypeCustom)][0];
NSData *imageData = UIImageJPEGRepresentation(editedImage, 1.0);
NSData *editData = [NSJSONSerialization dataWithJSONObject:edits options:0 error:nil];
PHAdjustmentData *adjustmentData = [[PHAdjustmentData alloc] initWithFormatIdentifier:#"profcam" formatVersion:#"1.0" data:editData];
PHContentEditingOutput *output = [[PHContentEditingOutput alloc] initWithContentEditingInput:contentEditingInput];
[imageData writeToURL:[output renderedContentURL] atomically:YES];
[output setAdjustmentData:adjustmentData];
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *request = [PHAssetChangeRequest changeRequestForAsset:asset];
request.contentEditingOutput = output;
} completionHandler:^(BOOL success, NSError *error) {
if (block) {
block(success, error);
}
}];
}];
}
My snippets will cause a crash, due to many values being nil. requestContentEditingWithOptions:completionHandler method gives nil for PHContentEditingInput, which causes many problems like file url being nil and so on. It also seems that the setCanHandleAdjustmentData block is never called - maybe this is the reason PHContentEditingInput is nil. Anyways, how should I fix this problem?