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
[email protected]
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