我正在尝试通过在 splitView 的主端创建一个三级大纲 View 来学习一些 Swift 和 xcode。退出重新加载数据后代码崩溃(见下文)。它成功地通过了 NSOutlineViewDataSource numberOfChildrenOfItem 函数(我预计在发生其他事情之前会进行第二次传递)，然后因“[NSView reloadData]:无法识别的选择器发送到实例”错误而崩溃。以下是可能的相关代码:
import Cocoa
//导入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()
}
}
//这些是NSOutlineViewDataSource所需的扩展函数
/* 返回子代或孙代的数量。 需要注意的一件事: item 是可选的，并且为零 用于数据模型的根对象。在这种情况下， 类别为零；否则它将包含 对象的父对象。对于categoryItem对象， 项目将是一个类别。 */
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
}
这是错误转储(我的知识不足以详细了解这一点):
[<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
)
有什么建议吗？提前致谢。
最佳答案
您的 socket 可能连接到的不是大纲 View (很可能是其 super View )。
您可以通过...检查
- 将鼠标悬停在 socket 圆圈上
- 或 Ctrl 单击 View 层次结构中的大纲 View 。
关于swift - [NSView重新加载数据] : unrecognized selector sent to instance，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47759876/