Argh never-ending troubles with bindings
Argh never-ending troubles with bindings
- Subject: Argh never-ending troubles with bindings
- From: Rick Mann <email@hidden>
- Date: Wed, 08 Feb 2017 15:44:15 -0800
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@hidden
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