iOS 15 上 UITableViewController 的便捷初始化崩溃
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【中文标题】iOS 15 上 UITableViewController 的便捷初始化崩溃【英文标题】：Convenience init for UITableViewController crashes on iOS 15 【发布时间】：2021-10-01 09:37:19 【问题描述】：在新创建的带有故事板的 Xcode 项目中使用 UITableViewController 的便捷初始化在 ios 15 上崩溃，但在 iOS 14 上运行良好。错误消息：
UIViewController is missing its initial trait collection populated during initialization.
This is a serious bug, likely caused by accessing properties or methods
on the view controller before calling a UIViewController initializer.
如何重现
打开 Xcode 13 使用 Storyboards 创建一个新项目 选择 iOS 14.0 以获取部署信息 创建一个空的 UITableViewControllerclass CustomTableViewController : UITableViewController
var data:String?
convenience init()
self.init(data: "test")
init(data: String)
self.data = data
super.init(style: .plain)
required init?(coder: NSCoder)
super.init(coder: coder)
class ViewController: UIViewController
override func viewDidLoad()
super.viewDidLoad()
// Do any additional setup after loading the view.
_ = CustomTableViewController()
2021-10-01 10:38:40.146584+0200 CustomViewControllerInit[62559:627294] *** Assertion failure in UITraitCollection *UIViewControllerMissingInitialTraitCollection(UIViewController *__strong)(), UIViewController.m:2434
2021-10-01 10:38:40.155555+0200 CustomViewControllerInit[62559:627294] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UIViewController is missing its initial trait collection populated during initialization. This is a serious bug, likely caused by accessing properties or methods on the view controller before calling a UIViewController initializer. View controller: <UITableViewController: 0x7fe1a7407580>'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff203fbbb4 __exceptionPreprocess + 242
1 libobjc.A.dylib 0x00007fff2019ebe7 objc_exception_throw + 48
2 Foundation 0x00007fff20750da9 -[NSMutableDictionary(NSMutableDictionary) classForCoder] + 0
3 UIKitCore 0x00007fff2483b6c6 UIViewControllerMissingInitialTraitCollection + 188
4 UIKitCore 0x00007fff2483fbef -[UIViewController traitCollection] + 155
5 UIKitCore 0x00007fff2482e93a -[UITableViewController dealloc] + 196
6 CustomViewControllerInit 0x000000010d33ea3d $s24CustomViewControllerInit0a5TablebC0CACycfc + 157
7 CustomViewControllerInit 0x000000010d33ea6f $s24CustomViewControllerInit0a5TablebC0CACycfcTo + 15
8 CustomViewControllerInit 0x000000010d33e99b $s24CustomViewControllerInit0a5TablebC0CACycfC + 27
9 CustomViewControllerInit 0x000000010d33d50d $s24CustomViewControllerInit0bC0C11viewDidLoadyyF + 109
10 CustomViewControllerInit 0x000000010d33d55c $s24CustomViewControllerInit0bC0C11viewDidLoadyyFTo + 28
11 UIKitCore 0x00007fff2483d2f0 -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 88
12 UIKitCore 0x00007fff24841cf4 -[UIViewController loadViewIfRequired] + 1187
13 UIKitCore 0x00007fff248420fc -[UIViewController view] + 27
14 UIKitCore 0x00007fff2503eb8b -[UIWindow addRootViewControllerViewIfPossible] + 313
15 UIKitCore 0x00007fff2503e279 -[UIWindow _updateLayerOrderingAndSetLayerHidden:actionBlock:] + 222
16 UIKitCore 0x00007fff2503f26a -[UIWindow _setHidden:forced:] + 409
17 UIKit 0x00007fff5963dc30 -[UIWindowAccessibility _orderFrontWithoutMakingKey] + 126
18 UIKitCore 0x00007fff25051e5a -[UIWindow _mainQueue_makeKeyAndVisible] + 47
19 UIKitCore 0x00007fff252bd80c -[UIWindowScene _makeKeyAndVisibleIfNeeded] + 202
20 UIKitCore 0x00007fff24386def +[UIScene _sceneForFBSScene:create:withSession:connectionOptions:] + 1605
21 UIKitCore 0x00007fff24ffd75c -[UIApplication _connectUISceneFromFBSScene:transitionContext:] + 1253
22 UIKitCore 0x00007fff24ffdc0b -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 289
23 UIKitCore 0x00007fff24a7e62e -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 358
24 FrontBoardServices 0x00007fff26483d98 -[FBSScene _callOutQueue_agent_didCreateWithTransitionContext:completion:] + 419
25 FrontBoardServices 0x00007fff264b04a3 __94-[FBSWorkspaceScenesClient createWithSceneID:groupID:parameters:transitionContext:completion:]_block_invoke.180 + 102
26 FrontBoardServices 0x00007fff2649221a -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 209
27 FrontBoardServices 0x00007fff264b0082 __94-[FBSWorkspaceScenesClient createWithSceneID:groupID:parameters:transitionContext:completion:]_block_invoke + 352
28 libdispatch.dylib 0x000000010d4e8c0c _dispatch_client_callout + 8
29 libdispatch.dylib 0x000000010d4ebb7f _dispatch_block_invoke_direct + 295
30 FrontBoardServices 0x00007fff264d6dc8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
31 FrontBoardServices 0x00007fff264d6cbe -[FBSSerialQueue _targetQueue_performNextIfPossible] + 174
32 FrontBoardServices 0x00007fff264d6df0 -[FBSSerialQueue _performNextFromRunLoopSource] + 19
33 CoreFoundation 0x00007fff20369e25 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
34 CoreFoundation 0x00007fff20369d1d __CFRunLoopDoSource0 + 180
35 CoreFoundation 0x00007fff20369254 __CFRunLoopDoSources0 + 340
36 CoreFoundation 0x00007fff20363951 __CFRunLoopRun + 875
37 CoreFoundation 0x00007fff20363103 CFRunLoopRunSpecific + 567
38 GraphicsServices 0x00007fff2c851cd3 GSEventRunModal + 139
39 UIKitCore 0x00007fff24ffbe63 -[UIApplication _run] + 928
40 UIKitCore 0x00007fff25000a53 UIApplicationMain + 101
41 libswiftUIKit.dylib 0x00007fff5933d052 $s5UIKit17UIApplicationMainys5Int32VAD_SpySpys4Int8VGGSgSSSgAJtF + 98
42 CustomViewControllerInit 0x000000010d33e088 $sSo21UIApplicationDelegateP5UIKitE4mainyyFZ + 104
43 CustomViewControllerInit 0x000000010d33e017 $s24CustomViewControllerInit11AppDelegateC5$mainyyFZ + 39
44 CustomViewControllerInit 0x000000010d33e108 main + 24
45 dyld 0x000000010d365e1e start_sim + 10
46 ??? 0x0000000000000001 0x0 + 1
)
libc++abi: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UIViewController is missing its initial trait collection populated during initialization. This is a serious bug, likely caused by accessing properties or methods on the view controller before calling a UIViewController initializer. View controller: <UITableViewController: 0x7fe1a7407580>'
terminating with uncaught exception of type NSException
CoreSimulator 776.3 - Device: iPhone 8 (1CCAF02C-6FB7-4DDB-A6F7-3CE9009A2EB2) - Runtime: iOS 15.0 (19A339) - DeviceType: iPhone 8
(lldb)
代码在 iOS 14.3 模拟器上运行良好。
【问题讨论】：
便利单元应该调用父级指定的init(self.init)。在这里你间接调用 super.init 。可能是问题的根源吗？即使它似乎适用于旧系统。 便利初始化不能调用父初始化。 “规则 2：便利构造器必须从同一个类中调用另一个构造器。”摘自：Apple Inc. “Swift 编程语言 (Swift 5.5)。”苹果图书。 books.apple.com/at/book/… 你似乎是对的。但是请检查此post 好的，所以也许解决方案是不要继承 UITableViewController，如果你这样做了，不要使用便捷初始化器。 【参考方案1】：虽然这可能是 UIKit 中的一个错误，但我找到了三个解决方案来解决这个问题。
-
不要继承 UITableViewController，见https://***.com/a/30719434/1702958
不要使用便捷初始化器，请参阅https://***.com/a/69121381/1702958
在指定的初始化器前加上
@objc，以便 UIKit 找到您指定的 init 方法：
@objc init(data: String)
super.init(style: .plain)
self.data = data
【讨论】：
好点你至少有解决方案。 我最喜欢的解决方案是“根本不要使用 UITableViewController”：D 我讨厌那些东西！遗憾的是，我继承了这段代码，并且它已经在 Objective C 中，所以我很难理解为什么我偶尔会遇到这个崩溃。以上是关于iOS 15 上 UITableViewController 的便捷初始化崩溃的主要内容，如果未能解决你的问题，请参考以下文章
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