在用Ojbect-c开发OSX应用的时候需要用到自定义控件并用代码进行布局，很自然地就使用了setTranslatesAutoresizingMaskIntoConstraints和setFrame组合，同时这个组合也很好的满足的需求。但是每当我先当前项目添加一个异常断点的时候，并开启调试程序，总是停在程序刚启动的main函数。经过debug发现是应为setTranslatesAutoresizingMaskIntoConstraints和setFrame组合导致了这个异常。

代码

[_programHeadView setTranslatesAutoresizingMaskIntoConstraints:YES];

[_programHeadView setFrame:headRect];

解决办法

在调用setTranslatesAutoresizingMaskIntoConstraints和setFrame之前先把view从父view用移除，调用之后再添加回去这样就能避免当前view的constraints和默认的constraints产生冲突。

[_programHeadView removeFromSuperview];

[_programHeadView setTranslatesAutoresizingMaskIntoConstraints:YES];

[_programHeadView setFrame:headRect];

[[[self window] contentView] addSubview:_programHeadView];

异常信息

* thread #: tid = 0x6931b, 0x00007fffb1b5745d libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1

  * frame #: 0x00007fffb1b5745d libobjc.A.dylib`objc_exception_throw

    frame #: 0x00007fff9cde1c3d CoreFoundation`+[NSException raise:format:] +

    frame #: 0x00007fff9b2a7014 AppKit`LAYOUT_CONSTRAINTS_NOT_SATISFIABLE +

    frame #: 0x00007fff9b2a717e AppKit`-[NSView(NSConstraintBasedLayout) engine:willBreakConstraint:dueToMutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9e994fea Foundation`-[NSISEngine handleUnsatisfiableRowWithHead:body:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9e996006 Foundation`-[NSISEngine tryUsingArtificialVariableToAddConstraintWithMarker:rowBody:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9e729325 Foundation`-[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9e99ea01 Foundation`-[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9e7207ac Foundation`-[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9a822033 AppKit`-[NSView(NSConstraintBasedLayout) _layoutEngine_didAddLayoutConstraint:integralizationAdjustment:mutuallyExclusiveConstraints:] +

    frame #: 0x00007fff9a7b68ba AppKit`-[NSView(NSConstraintBasedLayout) _constraints_didChangeAutoresizingConstraintsArrayForContainedView:] +

    frame #: 0x00007fff9a83c3ed AppKit`-[NSView updateConstraints] +

    frame #: 0x00007fff9a83bf27 AppKit`-[NSView _updateConstraintsForSubtreeIfNeededCollectingViewsWithInvalidBaselines:] +

    frame #: 0x00007fff9a83bd31 AppKit`-[NSView _updateConstraintsForSubtreeIfNeededCollectingViewsWithInvalidBaselines:] +

    frame #: 0x00007fff9a884c26 AppKit`__82-[NSView _updateConstraintsForSubtreeIfNeededCollectingViewsWithInvalidBaselines:]_block_invoke +

    frame #: 0x00007fff9e726adb Foundation`-[NSISEngine withBehaviors:performModifications:] +

    frame #: 0x00007fff9a83bc33 AppKit`-[NSView _updateConstraintsForSubtreeIfNeededCollectingViewsWithInvalidBaselines:] +

    frame #: 0x00007fff9b059c84 AppKit`__46-[NSView _updateConstraintsForSubtreeIfNeeded]_block_invoke +

    frame #: 0x00007fff9e726adb Foundation`-[NSISEngine withBehaviors:performModifications:] +

    frame #: 0x00007fff9a7b5760 AppKit`-[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] +

    frame #: 0x00007fff9b059a79 AppKit`-[NSView _updateConstraintsForSubtreeIfNeeded] +

    frame #: 0x00007fff9b2acbb8 AppKit`-[NSWindow(NSConstraintBasedLayout) _updateConstraintsForEngineHostingViews:] +

    frame #: 0x00007fff9a884a7a AppKit`__62-[NSWindow(NSConstraintBasedLayout) updateConstraintsIfNeeded]_block_invoke +

    frame #: 0x00007fff9e726adb Foundation`-[NSISEngine withBehaviors:performModifications:] +

    frame #: 0x00007fff9a7b5760 AppKit`-[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] +

    frame #: 0x00007fff9a88496e AppKit`-[NSWindow(NSConstraintBasedLayout) updateConstraintsIfNeeded] +

    frame #: 0x00007fff9a9248fb AppKit`___NSWindowGetDisplayCycleObserver_block_invoke +

    frame #: 0x00007fff9a924831 AppKit`__37+[NSDisplayCycle currentDisplayCycle]_block_invoke +

    frame #: 0x00007fffa2802dc6 QuartzCore`CA::Transaction::run_commit_handlers(CATransactionPhase) +

    frame #: 0x00007fffa290c8f0 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) +

    frame #: 0x00007fffa28018a1 QuartzCore`CA::Transaction::commit() +

    frame #: 0x00007fff9ac07b99 AppKit`__37+[NSDisplayCycle currentDisplayCycle]_block_invoke. +

    frame #: 0x00007fff9ccf8dd7 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ +

    frame #: 0x00007fff9ccf8d47 CoreFoundation`__CFRunLoopDoObservers +

    frame #: 0x00007fff9ccd9789 CoreFoundation`__CFRunLoopRun +

    frame #: 0x00007fff9ccd91c4 CoreFoundation`CFRunLoopRunSpecific +

    frame #: 0x00007fff9c23aebc HIToolbox`RunCurrentEventLoopInMode +

    frame #: 0x00007fff9c23abf9 HIToolbox`ReceiveNextEventCommon +

    frame #: 0x00007fff9c23ab26 HIToolbox`_BlockUntilNextEventMatchingListInModeWithFilter +

    frame #: 0x00007fff9a7d5e24 AppKit`_DPSNextEvent +

    frame #: 0x00007fff9af5185e AppKit`-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] +

    frame #: 0x00007fff9a7ca7ab AppKit`-[NSApplication run] +

    frame #: 0x00007fff9a7951de AppKit`NSApplicationMain +

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