Null passed to a callee that requires a non-null argument

Question

I have been using this to convert a CIImage to NSData for ages:

  NSData *data = [imageRep representationUsingType: NSPNGFileType
                                    


        

Answer 1

Is this the correct way to solve this problem?

Yes.

There appear to be a few places in the API which accepted nil values rather than an empty collection even though it was not documented as valid. The non-nil annotations added by Apple to better support inter-working with Swift are just highlighting these.