If I set an NSError in the method readFromURL of my NSDocument, I
am not able to overwrite the NSLocalizedDescriptionKey.
...
Unfortunately only the strings of the keys
NSLocalizedFailureReasonErrorKey and
NSLocalizedRecoverySuggestionErrorKey are displayed together with a
standard error text. My own localizedDescription ("Description") is
not displayed. Instead I got the standard error text "The document
<xyz> could not be opened. FailureReason RecoverySuggestion". Is
this a bug, that the string with the key NSLocalizedDescriptionKey
is always overwritten before displayed or not displayed at all, if
set in readFromURL or is this feature somewhere documented? I could
not find anything regarding this at apple.
No, the NSError object you create is just fine, but
NSDocumentController (which causes the error alert to be displayed)
*always* makes the alert say that the document could not be opened.
If you want to display your own description, you need to display
your own alert before returning from readFromURL:... (using [NSApp
presentError:], usually), then return an error with
domain=NSCocoaErrorDomain and code=NSUserCancelledError, to suppress
NSDocumentController's alert.
Thanks for your answer, but is this behaviour somewhere documented? I
looked into NSDocumentControllers documentation but nothing about such
an error and what is actually evaluated for the standard alert from
the given NSError. How did you find out? Simply by try and error?
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