NSCoder「只定義抽象類」的災難

-1

我有一個簡單的類（一旦充實）將構成由NSDocument子類處理的數據。但是，我陷入了困境，試圖使用NSDocument的數據（ofType :)和讀取（fromType :)方法來保存/初始化類。NSCoder「只定義抽象類」的災難

我在調試器中看到的錯誤是：

[常規] *** -encodeObject：forKey：只爲抽象類定義。定義 - [NSArchiver encodeObject：forKey：]！

我的文檔NSDocument的子類的樣子：

class Document: NSDocument 
{ 
    private(set) var coverTree = CoverTree() 

    // ... skipping boilerplate init and makeWindowControllers methods 

    override class func autosavesInPlace() -> Bool { 
    return false 
    } 

    override func data(ofType typeName: String) throws -> Data 
    { 
    return NSArchiver.archivedData(withRootObject: coverTree) 
    } 

    override func read(from data: Data, ofType typeName: String) throws 
    {   
    if let ct = NSUnarchiver(forReadingWith: data)?.decodeObject() as? CoverTree 
    { 
     coverTree = ct 
    } 
    } 
}

和我CoverTree類目前的樣子：

import Cocoa 

class CoverTree: NSObject, NSCoding 
{ 
    private(set) var generated = false 

    let creationStamp : String 

    override init() 
    { 
    let df = DateFormatter() 
    df.dateStyle = .full 
    df.timeStyle = .full 

    creationStamp = df.string(from: Date()) 

    super.init() 
    } 

    required init(coder decoder:NSCoder) 
    { 
    creationStamp = decoder.decodeObject(forKey: "creation") as! String 
    } 

    func encode(with coder: NSCoder) 
    { 
    coder.encode(self.creationStamp, forKey:"creation") 
    } 

    func generate(dataSet : DataSet) -> Void 
    { 
    generated = true 
    } 
}

在CoverTree執行的唯一線路發生錯誤時::編碼（）

我一直在抓我的頭髮，尋找示例都打開和關閉StackOverflow。我似乎遵循所有建議的模式/片段。

搜索錯誤字符串表明錯誤是由於使用NSCoder而不是NSKeyedArchiver ....但如果我更改編碼的簽名以編碼（與編碼器：NSKeyedArchiver），我得到一個錯誤，CoverTree不是符合NSCoding。

我缺少什麼？

謝謝了，邁克

這裏是整個堆棧跟蹤，如果這是任何幫助：

2017-09-11 09:55:44.682537-0400 coverTreeDemo[40650:3798144] [General] *** -encodeObject:forKey: only defined for abstract class. Define -[NSArchiver encodeObject:forKey:]! 
2017-09-11 09:55:44.691417-0400 coverTreeDemo[40650:3798144] [General] (
    0 CoreFoundation      0x00007fffa3ae357b __exceptionPreprocess + 171 
    1 libobjc.A.dylib      0x00007fffb8d3c1da objc_exception_throw + 48 
    2 CoreFoundation      0x00007fffa3b60c55 +[NSException raise:format:] + 197 
    3 Foundation       0x00007fffa5621abe NSRequestConcreteImplementation + 229 
    4 coverTreeDemo      0x0000000100003583 _TFC13coverTreeDemo9CoverTree6encodefT4withCSo7NSCoder_T_ + 163 
    5 coverTreeDemo      0x00000001000035fa _TToFC13coverTreeDemo9CoverTree6encodefT4withCSo7NSCoder_T_ + 58 
    6 Foundation       0x00007fffa54922e1 -[NSArchiver encodeRootObject:] + 164 
    7 Foundation       0x00007fffa5491a66 +[NSArchiver archivedDataWithRootObject:] + 141 
    8 coverTreeDemo      0x0000000100003f3b _TFC13coverTreeDemo8Document4datafzT6ofTypeSS_V10Foundation4Data + 491 
    9 coverTreeDemo      0x000000010000402b _TToFC13coverTreeDemo8Document4datafzT6ofTypeSS_V10Foundation4Data + 91 
    10 AppKit        0x00007fffa190121c -[NSDocument writeToURL:ofType:error:] + 812 
    11 AppKit        0x00007fffa1900ead -[NSDocument writeToURL:ofType:forSaveOperation:originalContentsURL:error:] + 445 
    12 AppKit        0x00007fffa208bbb1 -[NSDocument(NSDocumentSaving) _writeSafelyToURL:ofType:forSaveOperation:forceTemporaryDirectory:error:] + 915 
    13 AppKit        0x00007fffa208c8b7 -[NSDocument(NSDocumentSaving) _writeSafelyToURL:ofType:forSaveOperation:error:] + 28 
    14 AppKit        0x00007fffa190089e -[NSDocument writeSafelyToURL:ofType:forSaveOperation:error:] + 355 
    15 AppKit        0x00007fffa20978c5 __85-[NSDocument(NSDocumentSaving) _saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke_2.1116 + 233 
    16 AppKit        0x00007fffa20977cd __85-[NSDocument(NSDocumentSaving) _saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke.1113 + 454 
    17 AppKit        0x00007fffa2095903 __85-[NSDocument(NSDocumentSaving) _saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke_2.969 + 2071 
    18 Foundation       0x00007fffa56e8e48 __85-[NSFileCoordinator(NSPrivate) _coordinateWritingItemAtURL:options:error:byAccessor:]_block_invoke.404 + 226 
    19 Foundation       0x00007fffa56e88ab -[NSFileCoordinator(NSPrivate) _withAccessArbiter:invokeAccessor:orDont:andRelinquishAccessClaim:] + 493 
    20 Foundation       0x00007fffa557e206 -[NSFileCoordinator(NSPrivate) _coordinateWritingItemAtURL:options:error:byAccessor:] + 862 
    21 AppKit        0x00007fffa2092dd0 -[NSDocument(NSDocumentSaving) _fileCoordinator:coordinateReadingContentsAndWritingItemAtURL:byAccessor:] + 387 
    22 AppKit        0x00007fffa20950d4 __85-[NSDocument(NSDocumentSaving) _saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke.964 + 544 
    23 AppKit        0x00007fffa209462b __85-[NSDocument(NSDocumentSaving) _saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke + 508 
    24 AppKit        0x00007fffa1b2abd6 -[NSDocument(NSDocumentSerializationAPIs) continueFileAccessUsingBlock:] + 222 
    25 AppKit        0x00007fffa1b2b477 -[NSDocument(NSDocumentSerializationAPIs) _performFileAccess:] + 782 
    26 AppKit        0x00007fffa2094429 -[NSDocument(NSDocumentSaving) _saveToURL:ofType:forSaveOperation:completionHandler:] + 92 
    27 AppKit        0x00007fffa194b2a8 __85-[NSDocument saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke_2 + 256 
    28 AppKit        0x00007fffa18ba1e2 -[NSDocument _commitEditingThenContinue:] + 474 
    29 AppKit        0x00007fffa18b9fff -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] + 92 
    30 AppKit        0x00007fffa194b196 __85-[NSDocument saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke + 444 
    31 AppKit        0x00007fffa1b2a305 -[NSDocument(NSDocumentSerializationAPIs) performActivityWithSynchronousWaiting:usingBlock:cancellationHandler:] + 475 
    32 AppKit        0x00007fffa194afd4 -[NSDocument saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo:] + 113 
    33 AppKit        0x00007fffa2090ff1 __104-[NSDocument(NSDocumentSaving) _runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke.595 + 113 
    34 AppKit        0x00007fffa1b2a4d3 -[NSDocument(NSDocumentSerializationAPIs) _continueActivityUsingBlock:] + 320 
    35 AppKit        0x00007fffa2090de5 __104-[NSDocument(NSDocumentSaving) _runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke_2.580 + 506 
    36 AppKit        0x00007fffa209097c __104-[NSDocument(NSDocumentSaving) _runModalSavePanelForSaveOperation:delegate:didSaveSelector:contextInfo:]_block_invoke.561 + 1500 
    37 AppKit        0x00007fffa1c558b9 -[NSSavePanel _didEndSheet:returnCode:contextInfo:] + 95 
    38 AppKit        0x00007fffa17c3b84 -[NSWindow _endWindowBlockingModalSession:returnCode:] + 308 
    39 AppKit        0x00007fffa1c581c6 -[NSSavePanel overwriteAlertDidEnd:returnCode:contextInfo:] + 256 
    40 AppKit        0x00007fffa197a1e3 -[NSAlert didEndAlert:returnCode:contextInfo:] + 90 
    41 AppKit        0x00007fffa17c3b84 -[NSWindow _endWindowBlockingModalSession:returnCode:] + 308 
    42 AppKit        0x00007fffa18239e3 -[NSAlert buttonPressed:] + 107 
    43 libsystem_trace.dylib    0x00007fffb984f3a7 _os_activity_initiate_impl + 53 
    44 AppKit        0x00007fffa1cd0721 -[NSApplication(NSResponder) sendAction:to:from:] + 456 
    45 AppKit        0x00007fffa17b4cc4 -[NSControl sendAction:to:] + 86 
    46 AppKit        0x00007fffa17b4bec __26-[NSCell _sendActionFrom:]_block_invoke + 136 
    47 libsystem_trace.dylib    0x00007fffb984f3a7 _os_activity_initiate_impl + 53 
    48 AppKit        0x00007fffa17b4b44 -[NSCell _sendActionFrom:] + 128 
    49 AppKit        0x00007fffa17f7539 -[NSButtonCell _sendActionFrom:] + 98 
    50 libsystem_trace.dylib    0x00007fffb984f3a7 _os_activity_initiate_impl + 53 
    51 AppKit        0x00007fffa17b3426 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2481 
    52 AppKit        0x00007fffa17f7272 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 798 
    53 AppKit        0x00007fffa17b1ddb -[NSControl mouseDown:] + 832 
    54 AppKit        0x00007fffa1e4c24f -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 6341 
    55 AppKit        0x00007fffa1e48a6c -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 1942 
    56 AppKit        0x00007fffa1e47f0a -[NSWindow(NSEventRouting) sendEvent:] + 541 
    57 AppKit        0x00007fffa1ccc681 -[NSApplication(NSEvent) sendEvent:] + 1145 
    58 AppKit        0x00007fffa1547427 -[NSApplication run] + 1002 
    59 AppKit        0x00007fffa1511e0e NSApplicationMain + 1237 
    60 coverTreeDemo      0x0000000100002cbd main + 13 
    61 libdyld.dylib      0x00007fffb961d235 start + 1 
)

來源

2017-09-11 MikeMayer67

重複：//計算器。 com/questions/3892578/nscoding-protocol-question？ –

這是我看到的許多問題/答案之一，但它並沒有幫助我解決問題。現在知道核心問題是使用不受版權保護的版本，我可以看到這個信息在3892578 ...但是當我不知道問題實際是什麼時，解決方案並不明顯。 – MikeMayer67

的問題是，你是指在NSDocument子類NSArchiver和NSUnarchiver。這是錯誤的。這些類已被棄用。你應該使用NSKeyedArchiver和NSKeyedUnarchiver來代替它們。該docs是這個相當明確：

在MacOS的10.2及更高版本，NSArchiver和 NSUnarchiver 已換成的NSKeyedArchiver 和 NSKeyedUnarchiver 分別HTTPS的

來源

2017-09-11 14:29:10 matt

具體而言，問題是@ MikeMayer67在'NSArchiver'和'NSUnarchiver'上使用了密鑰存檔方法（雖然通過NSCoder超類公開，但是明確沒有實現）。 [簡單地用'NSKeyedArchiver'和'NSUnarchiver'替換'NSArchiver'和'NSKeyedUnarchiver'應該足以解決這個問題。] –

謝謝@ItaiFerber – matt

這實際上是我開始的，但我還有其他問題...所以我切換到無版本的版本，看看是否能解決我的問題。當事情還沒有奏效時，忘了切換回去。即使我將它們切換回鍵控版本，仍然存在一個問題（與上面的代碼示例不同）。在尋求額外的幫助之前，我會看看我能否達到底線。 – MikeMayer67

NSCoder「只定義抽象類」的災難

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