Tôi có một phiên bản UINavigationController
được lồng trong UITabBarController
. Tôi sử dụng bộ điều khiển điều hướng để tiếp cận với một số bộ điều khiển xem (thanh tab vẫn còn nhìn thấy được), từ đó tôi chuyển sang bộ điều khiển xem thứ hai (thanh tab không còn nhìn thấy được).Phương pháp UINavigationController setToolbarHidden lỗi trong Xcode 9: tính toán vô hạn các ràng buộc bố cục tự động dẫn đến OOM
Trong trình điều khiển chế độ xem thứ hai, ngay sau khi tôi thực hiện cuộc gọi đến: [self.navigationController setToolbarHidden:NO]
ứng dụng bị đóng băng và bộ nhớ phát triển cho đến khi ngoại lệ OOM gặp sự cố.
Tôi xác nhận rằng làm tổ bộ điều khiển chuyển hướng bên trong thanh tab không được khuyến khích, nhưng thiết lập này dường như làm việc tốt cho đến khi iOS 11.
EDIT: khi dừng thực hiện, tôi thấy rất nhiều cuộc gọi đến:
UIView(UIConstraintBasedLayout)
UIView(AdditionalLayerSupport)
NSLayoutConstraint
Dưới đây là stack đầy đủ dấu vết
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP * frame #0: 0x0000000106dd895c libobjc.A.dylib`objc_msgSend
+ 28
frame #1: 0x00000001067b6b9b Foundation`-[NSConcreteMapTable removeObjectForKey:] + 138
frame #2: 0x00000001069e6019 Foundation`_substituteOutAllOccurencesOfBodyVar + 1282
frame #3: 0x00000001067f3c5b Foundation`-[NSISEngine tryAddingDirectly:] + 144
frame #4: 0x00000001067f332f Foundation`-[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:]
+ 440
frame #5: 0x00000001069f2067 Foundation`-[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:]
+ 273
frame #6: 0x00000001067ea601 Foundation`-[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 240
frame #7: 0x0000000109c9488d UIKit`__57-[UIView(AdditionalLayoutSupport)
_switchToLayoutEngine:]_block_invoke_2 + 452
frame #8: 0x00000001067f0de1 Foundation`-[NSISEngine withBehaviors:performModifications:] + 131
frame #9: 0x0000000109c946a2 UIKit`__57-[UIView(AdditionalLayoutSupport)
_switchToLayoutEngine:]_block_invoke + 604
frame #10: 0x0000000109c9441e UIKit`-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 223
frame #11: 0x00000001091ed84f UIKit`__45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 112
frame #12: 0x00000001067f0de1 Foundation`-[NSISEngine withBehaviors:performModifications:] + 131
frame #13: 0x00000001091ed778 UIKit`-[UIView(Hierarchy) _postMovedFromSuperview:] + 855
frame #14: 0x00000001091fe031 UIKit`-[UIView(Internal) _addSubview:positioned:relativeTo:] + 1927
frame #15: 0x0000000109b507e1 UIKit`-[_UILayoutArrangement insertItem:atIndex:] + 502
frame #16: 0x0000000109ca1b4d UIKit`__50-[_UIOrderedLayoutArrangement insertItem:atIndex:]_block_invoke + 50
frame #17: 0x0000000109ca18df UIKit`-[_UIOrderedLayoutArrangement _trackChangesAffectingExternalBaselineConstraints:] + 320
frame #18: 0x0000000109ca1aea UIKit`-[_UIOrderedLayoutArrangement insertItem:atIndex:] + 478
frame #19: 0x000000010982edea UIKit`-[UIStackView insertArrangedSubview:atIndex:] + 283
frame #20: 0x0000000109b29972 UIKit`-[_UIButtonBar _layoutBar] + 3639
frame #21: 0x0000000109b2bb44 UIKit`-[_UIButtonBarStackView updateConstraints] + 48
frame #22: 0x0000000109c958b6 UIKit`-[UIView(AdditionalLayoutSupport)
_sendUpdateConstraintsIfNecessaryForSecondPass:] + 161
frame #23: 0x0000000109c95ed2 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 1296
frame #24: 0x0000000109c95d51 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 911
frame #25: 0x0000000109c95d51 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 911
frame #26: 0x0000000109c95d51 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 911
frame #27: 0x00000001067f0de1 Foundation`-[NSISEngine withBehaviors:performModifications:] + 131
frame #28: 0x0000000109c96703 UIKit`__100-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededWithViewForVariableChangeNotifications:]_block_invoke
+ 90
frame #29: 0x0000000109c94f61 UIKit`-[UIView(AdditionalLayoutSupport)
_withUnsatisfiableConstraintsLoggingSuspendedIfEngineDelegateExists:] + 104
frame #30: 0x0000000109c96272 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededWithViewForVariableChangeNotifications:] + 160
frame #31: 0x0000000109c9738c UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsAtEngineLevelIfNeededWithViewForVariableChangeNotifications:]
+ 401
frame #32: 0x00000001091ef1b6 UIKit`-[UIView(Hierarchy) layoutBelowIfNeeded] + 1517
frame #33: 0x000000010957b35e UIKit`-[_UIButtonBarButton willMoveToWindow:] + 63
frame #34: 0x00000001091ec996 UIKit`-[UIView(Hierarchy) _willMoveToWindow:] + 861
frame #35: 0x00000001091eb493 UIKit`__UIViewWillBeRemovedFromSuperview + 484
frame #36: 0x00000001091eb0ea UIKit`-[UIView(Hierarchy) removeFromSuperview] + 95
frame #37: 0x0000000109b295d3 UIKit`-[_UIButtonBar _layoutBar] + 2712
frame #38: 0x0000000109b2bb44 UIKit`-[_UIButtonBarStackView updateConstraints] + 48
frame #39: 0x0000000109c958b6 UIKit`-[UIView(AdditionalLayoutSupport)
_sendUpdateConstraintsIfNecessaryForSecondPass:] + 161
frame #40: 0x0000000109c95ed2 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 1296
frame #41: 0x0000000109c95d51 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 911
frame #42: 0x0000000109c95d51 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 911
frame #43: 0x0000000109c95d51 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededCollectingViews:forSecondPass:] + 911
frame #44: 0x00000001067f0de1 Foundation`-[NSISEngine withBehaviors:performModifications:] + 131
frame #45: 0x0000000109c96703 UIKit`__100-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededWithViewForVariableChangeNotifications:]_block_invoke
+ 90
frame #46: 0x0000000109c94f61 UIKit`-[UIView(AdditionalLayoutSupport)
_withUnsatisfiableConstraintsLoggingSuspendedIfEngineDelegateExists:] + 104
frame #47: 0x0000000109c96272 UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsIfNeededWithViewForVariableChangeNotifications:] + 160
frame #48: 0x0000000109c9738c UIKit`-[UIView(AdditionalLayoutSupport)
_updateConstraintsAtEngineLevelIfNeededWithViewForVariableChangeNotifications:]
+ 401
frame #49: 0x00000001091efa5b UIKit`-[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 159
frame #50: 0x00000001095742d5 UIKit`-[UILayoutContainerView layoutSubviews] + 270
frame #51: 0x0000000109204551 UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1331
frame #52: 0x00000001064db4ba QuartzCore`-[CALayer layoutSublayers] + 153
frame #53: 0x00000001064df5a9 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 401
frame #54: 0x00000001064681cd QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 365
frame #55: 0x0000000106493ae4 QuartzCore`CA::Transaction::commit() + 500
frame #56: 0x0000000109160687 UIKit`_afterCACommitHandler + 272
frame #57: 0x00000001080f8db7 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
+ 23
frame #58: 0x00000001080f8d0e CoreFoundation`__CFRunLoopDoObservers + 430
frame #59: 0x00000001080dd324 CoreFoundation`__CFRunLoopRun + 1572
frame #60: 0x00000001080dca89 CoreFoundation`CFRunLoopRunSpecific + 409
frame #61: 0x000000010dc429c6 GraphicsServices`GSEventRunModal + 62
frame #62: 0x0000000109135d30 UIKit`UIApplicationMain + 159
frame #63: 0x0000000101ff6bf9 MyAppName`main(argc=1, argv=0x00007fff5de3e0a8) at main.m:23
frame #64: 0x000000010f453d81 libdyld.dylib`start + 1
frame #65: 0x000000010f453d81 libdyld.dylib`start + 1