Save image to photo library using photo framework

Question

My app crashes every time when I try to save image using photo framework.

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMedi         


        

Answer 1

All you need to do is trigger a creation request. As the error says, you can access the change request only inside the performChanges block.

So to save the image you would do something like this:

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    [PHAssetChangeRequest creationRequestForAssetFromImage:[info valueForKey:UIImagePickerControllerOriginalImage]];
} completionHandler:^(BOOL success, NSError *error) {
    if (success) {
         NSLog(@"Success");
    }
    else {
        NSLog(@"write error : %@",error);
    }
}];

In case you need to do something with the placeholder of the newly created asset, you can access it inside the same performChanges block:

PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:[info valueForKey:UIImagePickerControllerOriginalImage]];
PHObjectPlaceholder *assetPlaceholder = changeRequest.placeholderForCreatedAsset;