Question

2017-07-21 10:34:14.447487+0530 demo[2783:104307] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. 
Try this: 
    (1) look at each constraint and try to figure out which you don't expect; 
    (2) find the code that added the unwanted constraint or constraints and fix it. 
(
"<NSLayoutConstraint:0x60000009a6d0 UICollectionView:0x7fbc1b825800.width == 343   (active)>",
"<NSLayoutConstraint:0x61000009b670 H:|-(16)-[UICollectionView:0x7fbc1b825800]   (active, names: '|':UIView:0x7fbc1a50d210 )>",
"<NSLayoutConstraint:0x61000009a680 H:[UICollectionView:0x7fbc1b825800]-(16)-|   (active, names: '|':UIView:0x7fbc1a50d210 )>",
"<NSLayoutConstraint:0x60800009a6d0 'UIView-Encapsulated-Layout-Width' UIView:0x7fbc1a50d210.width == 320   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x60000009a6d0 UICollectionView:0x7fbc1b825800.width == 343   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView 
listed in <UIKit/UIView.h> may also be helpful.
2017-07-21 10:34:14.453212+0530 demo[2783:104307] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want. 
Try this: 
    (1) look at each constraint and try to figure out which you don't expect; 
    (2) find the code that added the unwanted constraint or constraints and fix it. 
(
"<_UILayoutSupportConstraint:0x61000009bd00 _UILayoutGuide:0x7fbc1a40ae80.height == 20   (active)>",
"<_UILayoutSupportConstraint:0x6100000986f0 V:|-(0)-[_UILayoutGuide:0x7fbc1a40ae80]   (active, names: '|':UIView:0x7fbc1a50d210 )>",
"<_UILayoutSupportConstraint:0x61000009bda0 _UILayoutGuide:0x7fbc1a40b580.height == 0   (active)>",
"<_UILayoutSupportConstraint:0x61000009bd50 _UILayoutGuide:0x7fbc1a40b580.bottom == UIView:0x7fbc1a50d210.bottom   (active)>",
"<NSLayoutConstraint:0x608000099a00 UIButton:0x7fbc1a40a5e0'Submit'.height == 30   (active)>",
"<NSLayoutConstraint:0x60000009a950 UICollectionView:0x7fbc1b825800.height == 589   (active)>",
"<NSLayoutConstraint:0x61000009b490 V:[UIButton:0x7fbc1a40a5e0'Submit']-(8)-[UICollectionView:0x7fbc1b825800]   (active)>",
"<NSLayoutConstraint:0x61000009b710 V:[_UILayoutGuide:0x7fbc1a40ae80]-(0)-[UIButton:0x7fbc1a40a5e0'Submit']   (active)>",
"<NSLayoutConstraint:0x61000009b760 V:[UICollectionView:0x7fbc1b825800]-(20)-[_UILayoutGuide:0x7fbc1a40b580]   (active)>",
"<NSLayoutConstraint:0x60800009af40 'UIView-Encapsulated-Layout-Height' UIView:0x7fbc1a50d210.height == 568   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x60000009a950 UICollectionView:0x7fbc1b825800.height == 589   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2017-07-21 10:34:14.457 demo[2783:104307] *** Assertion failure in -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3600.7.47/UICollectionView.m:5115
2017-07-21 10:34:14.499 demo[2783:104307] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
*** First throw call stack:
(
0   CoreFoundation                      0x000000010a16eb0b __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x0000000107414141 objc_exception_throw + 48
2   CoreFoundation                      0x000000010a172cf2 +[NSException raise:format:arguments:] + 98
3   Foundation                          0x0000000106fae536 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
4   UIKit                               0x000000010822cea3 -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:] + 1991
5   UIKit                               0x000000010822d2fb -[UICollectionView dequeueReusableCellWithReuseIdentifier:forIndexPath:] + 169
6   demo                                0x0000000106e2e7d6 _TFC4demo20SecondViewController14collectionViewfTCSo16UICollectionView13cellForItemAtV10Foundation9IndexPath_CSo20UICollectionViewCell + 150
7   demo                                0x0000000106e2eaf7 _TToFC4demo20SecondViewController14collectionViewfTCSo16UICollectionView13cellForItemAtV10Foundation9IndexPath_CSo20UICollectionViewCell + 87
8   UIKit                               0x0000000108218925 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 446
9   UIKit                               0x0000000108218761 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:] + 35
10  UIKit                               0x000000010821d9bd -[UICollectionView _updateVisibleCellsNow:] + 4764
11  UIKit                               0x000000010822338e -[UICollectionView layoutSubviews] + 313
12  UIKit                               0x00000001079a955b -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1268
13  QuartzCore                          0x000000010cf38904 -[CALayer layoutSublayers] + 146
14  QuartzCore                          0x000000010cf2c526 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 370
15  QuartzCore                          0x000000010cf2c3a0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
16  QuartzCore                          0x000000010cebbe92 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
17  QuartzCore                          0x000000010cee8130 _ZN2CA11Transaction6commitEv + 468
18  QuartzCore                          0x000000010cee8b37 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 115
19  CoreFoundation                      0x000000010a114717 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
20  CoreFoundation                      0x000000010a114687 __CFRunLoopDoObservers + 391
21  CoreFoundation                      0x000000010a0f9038 CFRunLoopRunSpecific + 440
22  UIKit                               0x00000001078e008f -[UIApplication _run] + 468
23  UIKit                               0x00000001078e6134 UIApplicationMain + 159
24  demo                                0x0000000106e319a7 main + 55
25  libdyld.dylib                       0x000000010b10e65d start + 1
)

我正在使用swift编写应用程序，当我在iPhone模拟器上运行测试应用程序时，一切正常，但它崩溃并在控制台日志中显示此错误报告。另一件事是我刚刚创建了两个视图控制器应用程序和我已经设计了集合视图。在第一个视图控制器中它的工作但在第二个视图控制器中我的集合视图不起作用。

Answer 1

＆＃39; NSInternalInconsistencyException＆＃39;，原因：＆＃39;无法使视图出列种类：UICollectionElementKindCell与标识符单元格 - 必须为标识符注册一个nib或类或连接原型故事板中的单元格＆＃39;

该消息告诉我们，在您调用dequeueReusableViewOfKind的地方发生崩溃，因为您没有首先将视图注册为部分页眉或页脚。您必须确保在设置集合视图时还要将页眉/页脚（使用xib或类）注册到集合视图

标题：

与班级

collectionView.registerClass(YourHeaderClass.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "yourReuseIdentifier")

使用xib

var headerXib = UINib(nibName: "YourHeaderXib", bundle: nil)
collectionView.registerNib(headerXib, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: yourReuseIdentifier)

页脚：

与班级

collectionView.registerClass(SupplementaryViewClass.self, forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: yourReuseIdentifier)

使用xib

var footerXib = UINib(nibName: "YourFooterXib", bundle: nil)
collectionView.registerNib(footerXib, forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: yourReuseIdentifier)

libc ++ abi.dylib：以NSException类型的未捕获异常终止（集合视图中的错误）

1 个答案: