I am trying to learn a bit of Swift and xcode by creating a three-level outlineView in the master side of a splitView. The code crashes after exiting to reloadData (see below). It makes one successful pass through the NSOutlineViewDataSource numberOfChildrenOfItem function (I expected a second pass before anything else happened) and then crashes with the "[NSView reloadData]:unrecognized selector sent to instance" error. Here is what is probably the relevant code:
import Cocoa
// import WebKit
class MasterViewController: NSViewController {
@IBOutlet weak var outlineView: NSOutlineView!
var categories = [Category]()
override func viewDidLoad() {
super.viewDidLoad()
// Do view setup here.
if let filePath = Bundle.main.path(forResource: "Subjects", ofType: "plist"){
categories = Category.categoryList(filePath)
print(categories)
}
self.outlineView.reloadData()
}
}
//These are extension functions required by a NSOutlineViewDataSource
/* Returns the number of children or grandchildren. One thing to note: item is an optional, and will be nil for the root objects of your data model. In this case, it will be nil for Category; otherwise it will contain the parent of the object. For categoryItem objects, item will be a Category. */
extension MasterViewController: NSOutlineViewDataSource {
func outlineView(_ outlineView: NSOutlineView,
numberOfChildrenOfItem item: Any?) -> Int {
if let category = item as? Category {
return category.children.count
}else if let categoryItem = item as? CategoryItem {
return categoryItem.grandchildren.count
}
return categories.count
}
And here is the error dump (I am not knowledgeable enough to make much of this):
[<ProbleMatic.Category: 0x600000048190>, <ProbleMatic.Category: 0x604000049630>, <ProbleMatic.Category: 0x60400004e100>]
2017-12-11 11:16:30.361189-0700 ProbleMatic[11382:4324228] -[NSView reloadData]: unrecognized selector sent to instance 0x6000001237a0
2017-12-11 11:16:30.361701-0700 ProbleMatic[11382:4324228] [General] -[NSView reloadData]: unrecognized selector sent to instance 0x6000001237a0
2017-12-11 11:16:30.365690-0700 ProbleMatic[11382:4324228] [General] (
0 CoreFoundation 0x00007fff390b300b
__exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fff5fc91c76
objc_exception_throw + 48
2 CoreFoundation 0x00007fff3914bcd4
-[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x00007fff390293f0
___forwarding___ + 1456
4 CoreFoundation 0x00007fff39028db8
_CF_forwarding_prep_0 + 120
5 ProbleMatic 0x0000000100001cbc
_T011ProbleMatic20MasterViewControllerC11viewDidLoadyyF + 1148
6 ProbleMatic 0x0000000100001e44
_T011ProbleMatic20MasterViewControllerC11viewDidLoadyyFTo + 36
7 AppKit 0x00007fff3665b632
-[NSViewController _sendViewDidLoad] + 97
8 AppKit 0x00007fff36bffd99
_noteLoadCompletionForObject + 641
9 AppKit 0x00007fff365dfe21
-[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 2042
10 AppKit 0x00007fff366db13a
-[NSNib _instantiateNibWithExternalNameTable:options:] + 679
11 AppKit 0x00007fff366dad96
-[NSNib _instantiateWithOwner:options:topLevelObjects:] + 136
12 AppKit 0x00007fff366da06c
-[NSViewController loadView] + 343
13 AppKit 0x00007fff36651f32
-[NSViewController _loadViewIfRequired] + 75
14 AppKit 0x00007fff36651e9d
-[NSViewController view] + 30
15 AppKit 0x00007fff3666c96b
-[_NSSplitViewItemViewWrapper wrapView] + 94
16 AppKit 0x00007fff3666319e
-[NSSplitViewController _setupSplitView] + 593
17 AppKit 0x00007fff36662d15
-[NSSplitViewController viewDidLoad] + 155
18 AppKit 0x00007fff3665b632
-[NSViewController _sendViewDidLoad] + 97
19 AppKit 0x00007fff3665206d
-[NSViewController _loadViewIfRequired] + 390
20 AppKit 0x00007fff36651e9d
-[NSViewController view] + 30
21 AppKit 0x00007fff36aa4cc7
__67-[NSStoryboardEmbedSegueTemplate newDefaultPerformHandlerForSegue:]_block_invoke + 171
22 AppKit 0x00007fff36652015
-[NSViewController _loadViewIfRequired] + 302
23 AppKit 0x00007fff36651e9d
-[NSViewController view] + 30
24 AppKit 0x00007fff36eeaa23
+[NSWindow windowWithContentViewController:] + 41
25 AppKit 0x00007fff3714c44d
+[NSWindowController windowControllerWithContentViewController:] + 41
26 AppKit 0x00007fff36aa4888
__66-[NSStoryboardShowSegueTemplate newDefaultPerformHandlerForSegue:]_block_invoke + 172
27 AppKit 0x00007fff36aa4602
-[NSStoryboardShowSegueTemplate _perform:] + 275
28 AppKit 0x00007fff36da775a
-[NSApplication(NSResponder) sendAction:to:from:] + 312
29 AppKit 0x00007fff3684d933
-[NSControl sendAction:to:] + 86
30 AppKit 0x00007fff3684d85b
__26-[NSCell _sendActionFrom:]_block_invoke + 136
31 AppKit 0x00007fff3684d761
-[NSCell _sendActionFrom:] + 183
32 AppKit 0x00007fff3688ea18
-[NSButtonCell _sendActionFrom:] + 97
33 AppKit 0x00007fff3684bfca
-[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2438
34 AppKit 0x00007fff3688e75f
-[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 777
35 AppKit 0x00007fff3684aa64
-[NSControl mouseDown:] + 965
36 AppKit 0x00007fff36f46959
-[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 5891
37 AppKit 0x00007fff36f435b0
-[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2359
38 AppKit 0x00007fff36f4285c
-[NSWindow(NSEventRouting) sendEvent:] + 497
39 AppKit 0x00007fff36da3617
-[NSApplication(NSEvent) sendEvent:] + 307
40 AppKit 0x00007fff36604d9d
-[NSApplication run] + 812
41 AppKit 0x00007fff365d3f1a
NSApplicationMain + 804
42 ProbleMatic 0x000000010000f50d
main + 13
43 libdyld.dylib 0x00007fff60881115
start + 1
44 ??? 0x0000000000000003
0x0 + 3
)
Any suggestions? Thanks in advance.
