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10/14/2018
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// magic functions to get the CoreData context and entity's instance let context = getContext ( ) let entity = getEntity ( ) // nil out the binary blob, so CoreData erases the file in _EXTERNAL_DATA entity . setValue ( nil , forKey : " image " ) context . save ( ) // then actually save your new blob entity . setValue ( blob , forKey : " image " ) context . save ( ) 0 Comments custom NSOutlineView disclosure button 9/1/2018