我最近将一个复杂的应用程序转换为Swift 4.2。这是一个基于文档的应用程序。令我惊讶的是，我注意到当我合并所有文档窗口时，应用程序崩溃了。好吧，一开始我以为这是我的代码有问题，但是错了，即使是基于文档的新项目也有这些问题：
2018-07-18 10:10:49.080969+0200 testApp[41504:213340] [Layout] Unable to simultaneously satisfy constraints:
(
"<NSLayoutConstraint:0x600002165540 _leftBorderView.width == 1 (active, names: _leftBorderView:0x600003338640 )>",
"<NSLayoutConstraint:0x600002165630 _rightBorderView.width == 1 (active, names: _rightBorderView:0x6000033385a0 )>",
"<NSLayoutConstraint:0x600002165590 H:[_leftBorderView]-(0)-[_backgroundView] (active, names: _backgroundView:0x600003338460, _leftBorderView:0x600003338640 )>",
"<NSLayoutConstraint:0x6000021655e0 H:[_backgroundView]-(0)-[_rightBorderView] (active, names: _rightBorderView:0x6000033385a0, _backgroundView:0x600003338460 )>",
"<NSLayoutConstraint:0x6000021654f0 H:|-(0)-[_leftBorderView] (active, names: _leftBorderView:0x600003338640, _vibrantContentView:0x600003338500, '|':_vibrantContentView:0x600003338500 )>",
"<NSLayoutConstraint:0x600002165680 H:[_rightBorderView]-(0)-| (active, names: _vibrantContentView:0x600003338500, _rightBorderView:0x6000033385a0, '|':_vibrantContentView:0x600003338500 )>",
"<NSLayoutConstraint:0x600002164ff0 H:|-(0)-[_vibrantContentView] (active, names: _vibrantContentView:0x600003338500, _contentView:0x600003338320, '|':_contentView:0x600003338320 )>",
"<NSLayoutConstraint:0x600002165040 _vibrantContentView.trailing == _contentView.trailing (active, names: _vibrantContentView:0x600003338500, _contentView:0x600003338320 )>",
"<NSLayoutConstraint:0x600002164e60 H:|-(0)-[_contentView] (active, names: _contentView:0x600003338320, '|':NSTabButton:0x1017a5870'Untitled 2' )>",
"<NSLayoutConstraint:0x600002164eb0 _contentView.trailing == NSTabButton:0x1017a5870'Untitled 2'.trailing (active, names: _contentView:0x600003338320 )>",
"<NSAutoresizingMaskLayoutConstraint:0x60000216a9e0 h=--& v=--& NSTabButton:0x1017a5870'Untitled 2'.width == 1 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x600002165630 _rightBorderView.width == 1 (active, names: _rightBorderView:0x6000033385a0 )>
Set the NSUserDefault NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints to YES to have -[NSWindow visualizeConstraints:] automatically called when this happens. And/or, set a symbolic breakpoint on LAYOUT_CONSTRAINTS_NOT_SATISFIABLE to catch this in the debugger.
(lldb)
好。这似乎是appkit为合并窗口顶部的选项卡按钮生成的约束问题（如果我错了，请纠正我）。无论如何，我还是需要使用Xcode 10，所以我的问题是：有一种方法可以通过编程方式取消行为的约束或子类？
编辑
Set the NSUserDefault NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints to YES to have -[NSWindow visualizeConstraints:] automatically called when this happens. And/or, set a symbolic breakpoint on LAYOUT_CONSTRAINTS_NOT_SATISFIABLE to catch this in the debugger.
2018-07-18 18:45:58.321943+0200 testApp[43926:361604] *** Assertion failure in BOOL _NSWindowDidReachDisplayCycleLimit(NSWindow *, NSDisplayCycle *, NSDisplayCycleIdentifier, NSUInteger, NSString *)(), /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppKit/AppKit-1643.10.101/AppKit.subproj/NSWindow_DisplayCycle.m:236
2018-07-18 18:45:58.325357+0200 testApp[43926:361604] [General] An uncaught exception was raised
2018-07-18 18:45:58.325396+0200 testApp[43926:361604] [General] The window has been marked as needing another display pass, but it has already had more display passes than there are views in the window.
2018-07-18 18:45:58.331325+0200 testApp[43926:361604] [General] (
0 CoreFoundation 0x00007fff3c8d5d0b __exceptionPreprocess + 256
1 libobjc.A.dylib 0x00007fff68781243 objc_exception_throw + 48
2 CoreFoundation 0x00007fff3c8d9b94 +[NSException raise:format:arguments:] + 98
3 Foundation 0x00007fff3ed7bdd3 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 166
4 AppKit 0x00007fff3a5c41c6 -[NSWindow(NSDisplayCycle) _postWindowNeedsDisplayUnlessPostingDisabled] + 1214
5 AppKit 0x00007fff39dcc27b -[NSView _setSuperview:] + 778
6 AppKit 0x00007fff39dcbc10 -[NSView addSubview:] + 212
7 AppKit 0x00007fff3a883bc6 -[_NSVisualizedConstraintsView viewWillDraw] + 599
8 AppKit 0x00007fff3a655ba7 _NSViewWillDraw + 45
9 AppKit 0x00007fff3a651dcc NSViewSendViewWillDrawToSubviews + 247
10 AppKit 0x00007fff3a655ba7 _NSViewWillDraw + 45
11 AppKit 0x00007fff39f13bd9 -[NSView displayIfNeeded] + 901
12 AppKit 0x00007fff39f13823 -[NSWindow displayIfNeeded] + 270
13 AppKit 0x00007fff3a5c5597 __NSWindowGetDisplayCycleObserverForDisplay_block_invoke + 722
14 AppKit 0x00007fff3a3b21af NSDisplayCycleObserverInvoke + 170
15 AppKit 0x00007fff3a696f5e NSDisplayCycleFlush + 1073
16 QuartzCore 0x00007fff47c8f383 _ZN2CA11Transaction19run_commit_handlersE18CATransactionPhase + 49
17 QuartzCore 0x00007fff47c8da56 _ZN2CA11Transaction6commitEv + 186
18 AppKit 0x00007fff3a609d26 -[NSWindowStackController _syncInactiveTabWindowSizesForSnapshot] + 466
19 AppKit 0x00007fff3a609d70 -[NSWindowStackController _openTabPickerAnimated:] + 30
20 AppKit 0x00007fff3a19ebdc -[NSWindow(NSWindowTabbing) _toggleTabOverview:animated:] + 163
21 AppKit 0x00007fff3a19ec5c -[NSWindow(NSWindowTabbing) _toggleTabOverview:] + 72
22 AppKit 0x00007fff3a5362b5 -[NSApplication(NSResponder) sendAction:to:from:] + 312
23 AppKit 0x00007fff39fee7b7 -[NSMenuItem _corePerformAction] + 323
24 AppKit 0x00007fff39fee528 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 114
25 AppKit 0x00007fff3a06d65e -[NSMenu performActionForItemAtIndex:] + 133
26 AppKit 0x00007fff3a06d5c9 -[NSMenu _internalPerformActionForItemAtIndex:] + 94
27 AppKit 0x00007fff3a06d3f8 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 106
28 AppKit 0x00007fff39f436da NSSLMMenuEventHandler + 902
29 HIToolbox 0x00007fff3bacf719 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1502
30 HIToolbox 0x00007fff3bacea76 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 371
31 HIToolbox 0x00007fff3bae3bfd SendEventToEventTarget + 39
32 HIToolbox 0x00007fff3bb2cacf _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 380
33 HIToolbox 0x00007fff3bb55606 SendMenuCommandWithContextAndModifiers + 49
34 HIToolbox 0x00007fff3bb555bc SendMenuItemSelectedEvent + 191
35 HIToolbox 0x00007fff3bb5549f _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 96
36 HIToolbox 0x00007fff3bb55e49 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 603
37 HIToolbox 0x00007fff3bb55b5e _HandleMenuSelection2 + 453
38 AppKit 0x00007fff39f35aff _NSHandleCarbonMenuEvent + 223
39 AppKit 0x00007fff3a1785ca _DPSEventHandledByCarbon + 54
40 AppKit 0x00007fff3a5343d0 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2220
41 AppKit 0x00007fff39de08ae -[NSApplication run] + 699
42 AppKit 0x00007fff39db0917 NSApplicationMain + 782
43 testApp 0x00000001002d735d main + 13
44 libdyld.dylib 0x00007fff697553ed start + 1
45 ??? 0x0000000000000003 0x0 + 3