Allow all files type except one in NSOpenPanel

问题

my application create a "new" type (extension) of file, let say its ".newtype", so when i want to browse files with NSOpenPanel to create it, this type of files have to be not selectable.

how can i pass ALL files type except ".newtype" to the NSOpenPanel instance ?

回答1:

Provide a delegate that handles the NSOpenSavePanelDelegate protocol panel:shouldEnableURL: method.

来源：https://stackoverflow.com/questions/13235130/allow-all-files-type-except-one-in-nsopenpanel