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objective-ccocoansopenpanel

How to limit the choice in an NSOpenPanel to a specific filename?

When showing an NSOpenPanel, is there a way to limit the choice of the file to files which have a certain filename? I know you can limit the file types by setting openPanel.allowedFileTypes, but for a specific feature the user needs to select a file which is known to have a certain name (diallist.csv).

I know I can check after the panel closes, but it seems more user friendly to me to not let the user choose unacceptable files in the first place.

Solution

  • You can set a delegate for the NSOpenPanel : https://developer.apple.com/reference/appkit/nsopensavepaneldelegate

    As delegate you can validate and/or enable certain URLs:

    - (BOOL)panel:(id)sender shouldEnableURL:(NSURL *)url; or - (BOOL)panel:(id)sender validateURL:(NSURL *)url error:(NSError * _Nullable *)outError;