我正在添加一个UIDatePicker作为表的页脚。我有另一个UITableView的扩展,它实现了 "UIDatePicker"。traitCollectionDidChange 并且只做 beginUpdates 和 endUpdates。当我改变方向时,我遇到了下面的崩溃。
*** Assertion failure in -[UIPickerTableView _Bug_Detected_In_Client_Of_UITableView_Invalid_Number_Of_Rows_In_Section:],
/BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKitCore_Sim/UIKit-3901.4.2/UITableView.m:2407
2020-05-12 13:35:28.729340+0530 MyApplication[41892:1575639] *** Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0.
The number of rows contained in an existing section after the update (0) must be equal to the number of
rows contained in that section before the update (10000), plus or minus the number of rows inserted or
deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into
or out of that section (0 moved in, 0 moved out).'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff23c7127e __exceptionPreprocess + 350
1 libobjc.A.dylib 0x00007fff513fbb20 objc_exception_throw + 48
2 CoreFoundation 0x00007fff23c70ff8 +[NSException raise:format:arguments:] + 88
3 Foundation 0x00007fff256e9b51 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 191
4 UIKitCore 0x00007fff4825d508 -[UITableView _Bug_Detected_In_Client_Of_UITableView_Invalid_Number_Of_Rows_In_Section:] + 193
5 UIKitCore 0x00007fff4825cdc1 -[UITableView _endCellAnimationsWithContext:] + 16657
6 UIKitCore 0x00007fff48276e0b -[UITableView endUpdatesWithContext:] + 112
7 MyApplication 0x0000000103d13ed1 -[UITableView(RIAdditions) traitCollectionDidChange:] + 97
8 UIKitCore 0x00007fff4854ccc4 -[UIView _traitCollectionDidChangeInternal:] + 977
9 UIKitCore 0x00007fff4854d5c4 -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 161
10 UIKitCore 0x00007fff4854d80a -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 743
11 UIKitCore 0x00007fff4854d80a -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 743
12 UIKitCore 0x00007fff4854d80a -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 743
13 UIKitCore 0x00007fff4854d80a -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 743
14 UIKitCore 0x00007fff4854d80a -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 743
15 UIKitCore 0x00007fff4854d7ae -[UIView _wrappedProcessTraitCollectionDidChange:forceNotification:] + 651
16 UIKitCore 0x00007fff4854d935 -[UIView _processDidChangeRecursivelyFromOldTraits:toCurrentTraits:forceNotification:] + 140
17 UIKitCore 0x00007fff485783d2 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2243
18 QuartzCore 0x00007fff2b131db1 -[CALayer layoutSublayers] + 255
19 QuartzCore 0x00007fff2b137fa3 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 517
20 UIKitCore 0x00007fff48563635 -[UIView(Hierarchy) layoutBelowIfNeeded] + 980
21 UIKitCore 0x00007fff47978038 -[UINavigationController _layoutViewController:] + 1465
22 UIKitCore 0x00007fff479710e9 -[UINavigationController _layoutTopViewControllerLookForNested:] + 589
23 UIKitCore 0x00007fff47966e9a __105-[UINavigationController _repositionPaletteWithNavigationBarHidden:duration:shouldUpdateNavigationItems:]_block_invoke + 718
24 UIKitCore 0x00007fff47966b9c -[UINavigationController _repositionPaletteWithNavigationBarHidden:duration:shouldUpdateNavigationItems:] + 308
25 UIKitCore 0x00007fff47970339 -[UINavigationController _updateBarsForCurrentInterfaceOrientationAndForceBarLayout:] + 174
26 UIKitCore 0x00007fff47980763 __84-[UINavigationController willTransitionToTraitCollection:withTransitionCoordinator:]_block_invoke + 639
27 UIKitCore 0x00007fff47a42124 -[_UIViewControllerTransitionCoordinator _applyBlocks:releaseBlocks:] + 294
28 UIKitCore 0x00007fff47a3e446 -[_UIViewControllerTransitionContext __runAlongsideAnimations] + 263
29 UIKitCore 0x00007fff4856bde6 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 528
30 UIKitCore 0x00007fff4856c395 +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 99
31 UIKitCore 0x00007fff47a5665a __58-[_UIWindowRotationAnimationController animateTransition:]_block_invoke_2 + 278
32 UIKitCore 0x00007fff4856ff44 +[UIView(Internal) _performBlockDelayingTriggeringResponderEvents:forScene:] + 174
33 UIKitCore 0x00007fff47a563e8 __58-[_UIWindowRotationAnimationController animateTransition:]_block_invoke + 164
34 UIKitCore 0x00007fff4856bde6 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 528
35 UIKitCore 0x00007fff4856c395 +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 99
36 UIKitCore 0x00007fff47a562c0 -[_UIWindowRotationAnimationController animateTransition:] + 491
37 UIKitCore 0x00007fff480d2e9d -[UIWindow _rotateToBounds:withAnimator:transitionContext:] + 525
38 UIKitCore 0x00007fff480d58e0 -[UIWindow _rotateWindowToOrientation:updateStatusBar:duration:skipCallbacks:] + 2331
39 UIKitCore 0x00007fff480d5ed3 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 633
40 UIKitCore 0x00007fff480d4e27 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 119
41 UIKitCore 0x00007fff480d3ca4 __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 111
42 UIKitCore 0x00007fff480d3bcd -[UIWindow _updateToInterfaceOrientation:duration:force:] + 455
43 CoreFoundation 0x00007fff23b9b5bc __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
44 CoreFoundation 0x00007fff23b9aa35 _CFXRegistrationPost1 + 421
45 CoreFoundation 0x00007fff23b9a7a1 ___CFXNotificationPost_block_invoke + 193
46 CoreFoundation 0x00007fff23c988b3 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1811
47 CoreFoundation 0x00007fff23b9a0f6 _CFXNotificationPost + 950
48 Foundation 0x00007fff2574bbf7 -[NSNotificationCenter postNotificationName:object:userInfo:] + 59
49 UIKitCore 0x00007fff47cd5955 -[UIDevice setOrientation:animated:] + 224
50 UIKitCore 0x00007fff477c83f1 __134-[_UIWindowSceneDeviceOrientationSettingsDiffAction _updateDeviceOrientationWithSettingObserverContext:windowScene:transitionContext:]_block_invoke + 137
51 UIKitCore 0x00007fff47bd8c83 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:actions:completion:] + 865
52 UIKitCore 0x00007fff47cd2dff _UISceneSettingsDiffActionPerformChangesWithTransitionContext + 240
53 UIKitCore 0x00007fff477c8336 -[_UIWindowSceneDeviceOrientationSettingsDiffAction _updateDeviceOrientationWithSettingObserverContext:windowScene:transitionContext:] + 248
54 UIKitCore 0x00007fff477c8231 __163-[_UIWindowSceneDeviceOrientationSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke + 112
55 UIKitCore 0x00007fff47cd2d02 _UISceneSettingsDiffActionPerformActionsWithDelayForTransitionContext + 84
56 UIKitCore 0x00007fff477c80c1 -[_UIWindowSceneDeviceOrientationSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:] + 216
57 UIKitCore 0x00007fff476206e7 __64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke + 657
58 UIKitCore 0x00007fff4761f26c -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 248
59 UIKitCore 0x00007fff47620411 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 210
60 UIKitCore 0x00007fff47bfac66 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:] + 504
61 FrontBoardServices 0x00007fff365d6c07 -[FBSSceneImpl updater:didUpdateSettings:withDiff:transitionContext:completion:] + 565
62 FrontBoardServices 0x00007fff365fc99f __88-[FBSWorkspaceScenesClient sceneID:updateWithSettingsDiff:transitionContext:completion:]_block_invoke_2 + 123
63 FrontBoardServices 0x00007fff365e0c45 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 220
64 FrontBoardServices 0x00007fff365fc8dc __88-[FBSWorkspaceScenesClient sceneID:updateWithSettingsDiff:transitionContext:completion:]_block_invoke + 196
65 libdispatch.dylib 0x000000010610ed48 _dispatch_client_callout + 8
66 libdispatch.dylib 0x0000000106111cb9 _dispatch_block_invoke_direct + 300
67 FrontBoardServices 0x00007fff3662237e __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
68 FrontBoardServices 0x00007fff3662206c -[FBSSerialQueue _queue_performNextIfPossible] + 441
69 FrontBoardServices 0x00007fff3662257b -[FBSSerialQueue _performNextFromRunLoopSource] + 22
70 CoreFoundation 0x00007fff23bd4471 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
71 CoreFoundation 0x00007fff23bd439c __CFRunLoopDoSource0 + 76
72 CoreFoundation 0x00007fff23bd3b74 __CFRunLoopDoSources0 + 180
73 CoreFoundation 0x00007fff23bce87f __CFRunLoopRun + 1263
74 CoreFoundation 0x00007fff23bce066 CFRunLoopRunSpecific + 438
75 GraphicsServices 0x00007fff384c0bb0 GSEventRunModal + 65
76 UIKitCore 0x00007fff48092d4d UIApplicationMain + 1621
77 MyApplication 0x00000001041a68db main + 107
78 libdyld.dylib 0x00007fff5227ec25 start + 1
79 ??? 0x0000000000000002 0x0 + 2
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我发现这个崩溃是由于datePicker(或者可能是它里面的表),即UIPickerTableView.代码在self.endUpdates()行崩溃。UIPickerTableView的代码在self.endUpdates()行崩溃。请找到我创建的虚拟应用程序的代码。
class ViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
let datePicker = UIDatePicker()
datePicker.datePickerMode = .date
self.tableView.tableFooterView = datePicker
}
}
extension UITableView {
open override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
self.beginUpdates()
self.endUpdates()
}
}
如果有人能帮助我了解崩溃的根本原因,我将非常高兴。
经过评论和一些测试...
traitCollectionDidChange
在扩展甚至没有调用beginUpdates()
endUpdates()
是导致崩溃的原因澄清一下 beginUpdates()
endUpdates()
...
他们告诉表视图处理对表的动画变化。橆 重新加载单元格。一个常见的用法是使用 "回调 "闭包来展开折叠单元格。
假设一个自定义单元格有各种UI元素,包括一个 "展开折叠 "按钮。代码中的 cellForRowAt
可能看起来像这样。
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let c = tableView.dequeueReusableCell(withIdentifier: "sCell", for: indexPath) as! SimpleCell
c.myLabel.text = "\(indexPath)"
c.callback = {
c.myHeightConstraint.constant = c.myHeightConstraint.constant == 21 ? 60 : 21
tableView.beginUpdates()
tableView.endUpdates()
}
return c
}
当按钮在单元格中被点击时,它就会回调到闭合器,从而切换到我们单元格。myHeightConstraint
21岁至60岁之间。随着 这些调用,我们可以看到行的高度动画。如果没有这些调用,我们就会看到行的高度动画。 这些调用,行不会改变高度,直到其他东西告诉表视图重新编排行。
请注意,Apple 的文档中说这些调用将被淘汰,转为使用 performBatchUpdates()
:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let c = tableView.dequeueReusableCell(withIdentifier: "sCell", for: indexPath) as! SimpleCell
c.myLabel.text = "\(indexPath)"
c.callback = {
c.myHeightConstraint.constant = c.myHeightConstraint.constant == 21 ? 60 : 21
tableView.performBatchUpdates(nil, completion: nil)
}
return c
}
会达到同样的目的。
所以,由于这些电话除了做任何事情之外 肇事者 - 听起来他们应该被移除。