iOS8中的自动布局崩溃
[英]Autolayout crash in iOS8
问题描述
Programmatically adding subview to UIScrollView from xib with autolayout turned on. 
在xib autolayout打开的情况下，以编程方式从xib将子视图添加到UIScrollView 。 Receiving crash: 接收崩溃：
2015-02-25 22:21:25.829 EAIntroView[5215:1435025] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 5 beyond bounds [0 .. 4]'
*** First throw call stack:
(
0 CoreFoundation 0x000000010c1f4f35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010be8dbb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010c0dff33 -[__NSArrayM objectAtIndex:] + 227
3 UIKit 0x000000010c87b5b1 _UIViewTopDownSubtreeTraversal + 193
4 UIKit 0x000000010ceacee6 -[UIView(UIConstraintBasedLayout_EngineDelegate) _invalidateSystemLayoutSizeFittingSizeAtEngineDelegateLevel] + 128
5 Foundation 0x000000010ba319bf -[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] + 915
6 Foundation 0x000000010bbbb0f8 -[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] + 275
7 Foundation 0x000000010ba2611a -[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 220
8 UIKit 0x000000010cea9de5 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 474
9 Foundation 0x000000010ba33d6e -[NSISEngine withBehaviors:performModifications:] + 155
10 UIKit 0x000000010cea9beb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 452
11 UIKit 0x000000010cea99fe -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
12 UIKit 0x000000010cea9ce4 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 217
13 Foundation 0x000000010ba33d6e -[NSISEngine withBehaviors:performModifications:] + 155
14 UIKit 0x000000010cea9beb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 452
15 UIKit 0x000000010cea99fe -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
16 UIKit 0x000000010cea9ce4 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 217
17 Foundation 0x000000010ba33d6e -[NSISEngine withBehaviors:performModifications:] + 155
18 UIKit 0x000000010cea9beb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 452
19 UIKit 0x000000010cea99fe -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
20 UIKit 0x000000010c8a568b -[UIScrollView _switchToLayoutEngine:] + 69
21 UIKit 0x000000010cea9ce4 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 217
22 Foundation 0x000000010ba33d6e -[NSISEngine withBehaviors:performModifications:] + 155
23 UIKit 0x000000010cea9beb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 452
24 UIKit 0x000000010cea99fe -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
25 UIKit 0x000000010cea9ce4 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 217
26 Foundation 0x000000010ba33d6e -[NSISEngine withBehaviors:performModifications:] + 155
27 UIKit 0x000000010cea9beb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 452
28 UIKit 0x000000010cea99fe -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
29 UIKit 0x000000010cea9671 -[UIView(AdditionalLayoutSupport) _initializeHostedLayoutEngine] + 404
30 UIKit 0x000000010ce9e591 -[UIView(UIConstraintBasedLayout) _layoutEngine_windowDidChange] + 127
31 UIKit 0x000000010c8984a5 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 207
32 UIKit 0x000000010c891112 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 125
33 UIKit 0x000000010c891086 -[UIView(Hierarchy) _postMovedFromSuperview:] + 437
34 UIKit 0x000000010c89af4b -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1604
35 UIKit 0x000000010cabfe84 -[UILayoutContainerView addSubview:] + 75
36 EAIntroView 0x000000010b93e14a -[EAIntroView showInView:animateDuration:withInitialPageIndex:] + 362
37 EAIntroView 0x000000010b93dfc9 -[EAIntroView showInView:animateDuration:] + 121
38 EAIntroView 0x000000010b9303a7 -[ViewController showIntroWithCustomViewFromNib] + 1879
39 EAIntroView 0x000000010b9326a4 -[ViewController tableView:didSelectRowAtIndexPath:] + 340
40 UIKit 0x000000010c90c393 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1293
41 UIKit 0x000000010c90c4d4 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 219
42 UIKit 0x000000010c847331 _applyBlockToCFArrayCopiedToStack + 314
43 UIKit 0x000000010c8471ab _afterCACommitHandler + 516
44 CoreFoundation 0x000000010c129dc7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
45 CoreFoundation 0x000000010c129d20 __CFRunLoopDoObservers + 368
46 CoreFoundation 0x000000010c11fb53 __CFRunLoopRun + 1123
47 CoreFoundation 0x000000010c11f486 CFRunLoopRunSpecific + 470
48 GraphicsServices 0x00000001106f59f0 GSEventRunModal + 161
49 UIKit 0x000000010c824420 UIApplicationMain + 1282
50 EAIntroView 0x000000010b932843 main + 115
51 libdyld.dylib 0x000000010e9c7145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Doesn't matter if there are any autolayout constraints in xib . 如果有任何自动布局约束不要紧xib 。 Adding autolayout constraints to programmatically created subviews (without xib ) - leads to the same crash. 将自动布局约束添加到以编程方式创建的子视图（不带xib ）会导致相同的崩溃。
But: if we create and show custom view without any autolayout, hide it and create new with autolayout xib - it will work perfectly, even with all constraints working. 但是：如果我们创建并显示没有任何自动布局的自定义视图，请将其隐藏并使用自动布局xib创建新xib -即使在所有约束都起作用的情况下，它也将完美运行。
Related SO question: NSRangeException on iOS 8 相关的问题： iOS 8上的NSRangeException
Solution from that question: 该问题的解决方案：
Turning AutoLayout off for all of my XIBs solved the issue.
All code, example project and related issue on GitHub: https://github.com/ealeksandrov/EAIntroView/issues/100 GitHub上的所有代码，示例项目和相关问题： https ： //github.com/ealeksandrov/EAIntroView/issues/100
1 个解决方案
解决方案1
0 已采纳 2015-06-11 21:16:08
I finally found a root cause of this issue: subviews property override in my UIScrollView subclass ( EARestrictedScrollView.m#L54-56 ). 我终于找到了这个问题的根本原因： subviews属性重写我UIScrollView子类（ EARestrictedScrollView.m＃L54-56 ）。
Autolayout somehow uses subview property and overriding it breaks things. 自动布局以某种方式使用subview属性，并且覆盖它会破坏事情。 This is inconsistent and depends on many other things, but fixing subviews deals it for me in 100% of cases. 这是不一致的，并且取决于许多其他因素，但是在100％的情况下，修复subviews对我来说都是如此。
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