我允许我的应用程序的用户通过mac app登录facebook。我已经在webview上加载了facebook登录页面，询问了用户权限，从facebook获取了AccessToken / UserDetails - 一切正常。 除非有时它在我退出并重新登录应用程序时崩溃。我确实在我的应用程序中发现了潜在的内存问题，并没有发现任何内容。该应用程序崩溃：
*** -[WebCoreThemeWindow _hasActiveAppearanceIgnoringKeyFocus]: message sent to deallocated instance 0x6080001e6400
显然将消息传递给解除分配的对象。但是我无法解释为什么它被解除分配以及它是什么实例......
- 0 : "0 ??? 0x0000000108cdcb76 0x0 + 4442671990"
- 1 : "1 MY_APP_NAME 0x000000010002d760 main + 0"
- 2 : "2 AppKit 0x00007fff925eb7ef -[NSButtonCell _preferInactiveBezelArtInView:] + 72"
- 3 : "3 AppKit 0x00007fff9263e72b -[NSButtonCell _preferInactiveContentInView:] + 22"
- 4 : "4 AppKit 0x00007fff925eb5cf -[NSButtonCell _hasRolloverContentArt] + 76"
- 5 : "5 AppKit 0x00007fff925eb541 hasAnyRollover + 183"
- 6 : "6 AppKit 0x00007fff925eb2ad -[NSButtonCell _updateMouseTracking] + 140"
- 7 : "7 AppKit 0x00007fff925eb0e2 -[NSButtonCell setControlView:] + 59"
- 8 : "8 AppKit 0x00007fff9272812d -[NSButtonCell drawWithFrame:inView:] + 193"
- 9 : "9 WebCore 0x00007fff9c6adc61 _ZN7WebCore8ThemeMac38drawCellOrFocusRingWithViewIntoContextEP6NSCellRNS_15GraphicsContextERKNS_9FloatRectEP6NSViewbbbf + 561"
- 10 : "10 WebCore 0x00007fff9c6b07df _ZN7WebCoreL17paintToggleButtonENS_11ControlPartERNS_13ControlStatesERNS_15GraphicsContextERKNS_9FloatRectEfPNS_10ScrollViewEff + 2847"
- 11 : "11 WebCore 0x00007fff9c4658e0 _ZN7WebCore11RenderTheme5paintERKNS_9RenderBoxERNS_13ControlStatesERKNS_9PaintInfoERKNS_10LayoutRectE + 656"
- 12 : "12 WebCore 0x00007fff9b78c7a0 _ZN7WebCore9RenderBox19paintBoxDecorationsERNS_9PaintInfoERKNS_11LayoutPointE + 528"
- 13 : "13 WebCore 0x00007fff9b789e5b _ZN7WebCore11RenderBlock11paintObjectERNS_9PaintInfoERKNS_11LayoutPointE + 299"
- 14 : "14 WebCore 0x00007fff9b78c155 _ZN7WebCore11RenderBlock5paintERNS_9PaintInfoERKNS_11LayoutPointE + 309"
- 15 : "15 WebCore 0x00007fff9c3d5065 _ZN7WebCore11RenderLayer27paintBackgroundForFragmentsERKN3WTF6VectorINS_13LayerFragmentELm1ENS1_15CrashOnOverflowELm16EEERNS_15GraphicsContextES9_RKNS_10LayoutRectEbRKNS0_17LayerPaintingInfoEjPNS_12RenderObjectE + 389"
- 16 : "16 WebCore 0x00007fff9c3d2214 _ZN7WebCore11RenderLayer18paintLayerContentsERNS_15GraphicsContextERKNS0_17LayerPaintingInfoEj + 2356"
- 17 : "17 WebCore 0x00007fff9c3d24b5 _ZN7WebCore11RenderLayer18paintLayerContentsERNS_15GraphicsContextERKNS0_17LayerPaintingInfoEj + 3029"
- 18 : "18 WebCore 0x00007fff9c3d24b5 _ZN7WebCore11RenderLayer18paintLayerContentsERNS_15GraphicsContextERKNS0_17LayerPaintingInfoEj + 3029"
- 19 : "19 WebCore 0x00007fff9c3cfe47 _ZN7WebCore11RenderLayer5paintERNS_15GraphicsContextERKNS_10LayoutRectERKNS_10LayoutSizeEjPNS_12RenderObjectEj + 263"
- 20 : "20 WebCore 0x00007fff9bd16cd2 _ZN7WebCore9FrameView13paintContentsERNS_15GraphicsContextERKNS_7IntRectE + 546"
- 21 : "21 WebKitLegacy 0x00007fff9c948f2c -[WebFrame(WebInternal) _drawRect:contentsOnly:] + 268"
- 22 : "22 WebKitLegacy 0x00007fff9c948b1c -[WebHTMLView drawSingleRect:] + 316"
- 23 : "23 WebKitLegacy 0x00007fff9c948857 -[WebHTMLView drawRect:] + 423"
- 24 : "24 AppKit 0x00007fff9272644d -[NSView(NSInternal) _recursive:displayRectIgnoringOpacity:inGraphicsContext:CGContext:topView:shouldChangeFontReferenceColor:] + 1318"
- 25 : "25 WebKitLegacy 0x00007fff9c9485db -[WebHTMLView(WebPrivate) _recursive:displayRectIgnoringOpacity:inGraphicsContext:CGContext:topView:shouldChangeFontReferenceColor:] + 251"
- 26 : "26 AppKit 0x00007fff92725df4 __46-[NSView(NSLayerKitGlue) drawLayer:inContext:]_block_invoke + 267"
- 27 : "27 AppKit 0x00007fff9272591d -[NSView(NSLayerKitGlue) _drawViewBackingLayer:inContext:drawingHandler:] + 1589"
- 28 : "28 AppKit 0x00007fff927252e2 -[NSView(NSLayerKitGlue) drawLayer:inContext:] + 80"
- 29 : "29 WebKitLegacy 0x00007fff9c94e1f8 -[WebHTMLView(WebInternal) drawLayer:inContext:] + 72"
- 30 : "30 AppKit 0x00007fff9285b5bf -[_NSBackingLayerContents drawLayer:inContext:] + 162"
- 31 : "31 QuartzCore 0x00007fff9a569fd2 -[CALayer drawInContext:] + 257"
- 32 : "32 AppKit 0x00007fff9285b098 -[_NSTiledLayer drawTile:inContext:] + 624"
- 33 : "33 AppKit 0x00007fff9285adce -[_NSTiledLayerContents drawLayer:inContext:] + 176"
- 34 : "34 QuartzCore 0x00007fff9a569fd2 -[CALayer drawInContext:] + 257"
- 35 : "35 AppKit 0x00007fff9285ad15 -[NSTileLayer drawInContext:] + 169"
- 36 : "36 QuartzCore 0x00007fff9a44d2ba CABackingStoreUpdate_ + 3726"
- 37 : "37 QuartzCore 0x00007fff9a569bcc ___ZN2CA5Layer8display_Ev_block_invoke + 75"
- 38 : "38 QuartzCore 0x00007fff9a569846 _ZN2CA5Layer8display_Ev + 1748"
- 39 : "39 AppKit 0x00007fff9285ac2c -[NSTileLayer display] + 119"
- 40 : "40 AppKit 0x00007fff93025a7b -[_NSTiledLayerContents update:shouldCallPrepareContent:] + 5174"
- 41 : "41 AppKit 0x00007fff927dd5de -[_NSTiledLayer display] + 389"
- 42 : "42 QuartzCore 0x00007fff9a55d9a6 _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 572"
- 43 : "43 QuartzCore 0x00007fff9a55dad1 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 35"
- 44 : "44 QuartzCore 0x00007fff9a5532e8 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280"
- 45 : "45 QuartzCore 0x00007fff9a44a5e5 _ZN2CA11Transaction6commitEv + 475"
- 46 : "46 AppKit 0x00007fff929ec1cd __37+[NSDisplayCycle currentDisplayCycle]_block_invoke.31 + 323"
- 47 : "47 CoreFoundation 0x00007fff9494ff67 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23"
- 48 : "48 CoreFoundation 0x00007fff9494fed7 __CFRunLoopDoObservers + 391"
- 49 : "49 CoreFoundation 0x00007fff94930b79 __CFRunLoopRun + 873"
- 50 : "50 CoreFoundation 0x00007fff949305b4 CFRunLoopRunSpecific + 420"
- 51 : "51 HIToolbox 0x00007fff93ed1f6c RunCurrentEventLoopInMode + 240"
- 52 : "52 HIToolbox 0x00007fff93ed1da1 ReceiveNextEventCommon + 432"
- 53 : "53 HIToolbox 0x00007fff93ed1bd6 _BlockUntilNextEventMatchingListInModeWithFilter + 71"
- 54 : "54 AppKit 0x00007fff925c85f5 _DPSNextEvent + 1093"
- 55 : "55 AppKit 0x00007fff92cd88eb -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1637"
- 56 : "56 AppKit 0x00007fff925bcfbd -[NSApplication run] + 926"
- 57 : "57 AppKit 0x00007fff92587a8a NSApplicationMain + 1237"
- 58 : "58 MY_APP_NAME 0x000000010002d7b4 main + 84"
- 59 : "59 libdyld.dylib 0x00007fffa9970255 start + 1"
- 60 : "60 ??? 0x0000000000000003 0x0 + 3"
这可能是它的webview内部崩溃吗？我认为这与facebook无关。崩溃不会一直发生。它是随机的（一次在三次试验中）。
非常欢迎任何帮助/线索。
编辑：解决方案：使用旧的WebView，现在使用WKWebView。工作精细。至少我们应该在调试时使用WKWebView获得一些警告。