I have the simplest of Document-based macOS apps created in Xcode 8.2.3. In the Document.makeWindowControllers method, I set my ViewController's representedObject to the document.
override func makeWindowControllers() { let storyboard = NSStoryboard(name: "Main", bundle: nil) let windowController = storyboard.instantiateController(withIdentifier: "Document Window Controller") as! NSWindowController let vc = windowController.contentViewController as! ViewController vc.representedObject = self self.addWindowController(windowController) } In the Storyboard, I bind an Array Controller in the View Controller scene to ViewController.self.representedObject.managedObjectContext. I don't have anything bound to the Array Controller (yet). But after launching and displaying the window, I get this (note the first message is me making sure my representedObject is getting set): ViewController.swift:25 Set represented object to: Optional(<PromotionalChargeManager.Document: 0x600000120960>) 2017-02-08 15:39:41.178728 PromotionalChargeManager[51621:17330300] [General] Cannot perform operation without a managed object context 2017-02-08 15:39:41.181165 PromotionalChargeManager[51621:17330300] [General] ( 0 CoreFoundation 0x00007fffc9edd0db __exceptionPreprocess + 171 1 libobjc.A.dylib 0x00007fffdeb6ea2a objc_exception_throw + 48 2 CoreFoundation 0x00007fffc9f5a9c5 +[NSException raise:format:] + 197 3 AppKit 0x00007fffc80281bc -[_NSManagedProxy _managedObjectContext] + 66 4 AppKit 0x00007fffc80281dc -[_NSManagedProxy _persistentStoreCoordinator] + 22 5 AppKit 0x00007fffc802824f -[_NSManagedProxy _entity] + 46 ... Now, as far as I can tell, I'm doing EXACTLY what Apple says I should do in https://developer.apple.com/library/content/qa/qa1871/_index.html Note that I've also tried setting the Array Controller's content binding to gobbledegook, hoping for a complaint about something not being KVO-compliant for that nonexistent property. No such luck. What am I doing wrong? Thanks! -- Rick Mann rm...@latencyzero.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com