本文介绍了由于未捕获的异常"CALayerInvalidGeometry"而终止应用程序，原因:"CALayer位置包含NaN:[nan nan]"的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我猜问题始于XCode 10.2.x当XCode 10.1
崩溃点是下面代码中的"pdfView.frame = self.view.frame":
The crash point is "pdfView.frame = self.view.frame" from below code:
import UIKit
import PDFKit
class ViewController: UIViewController {
var pdfView = PDFView()
override func viewDidLoad() {
super.viewDidLoad()
// Prepare document to show
let url = Bundle.main.url(forResource: "sample", withExtension: "pdf")
let pdfDocument = PDFDocument(url: url!)
// PDFView
pdfView = PDFView()
pdfView.frame = self.view.frame
pdfView.autoScales = true
pdfView.document = pdfDocument
// Add PDFView to viewController
self.view.addSubview(pdfView)
}
}
崩溃日志:
2019-05-20 16:24:39.269219+0530 PDFKitDemo[6795:305736] *** Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan nan]'
*** First throw call stack:
(
0 CoreFoundation 0x00000001118c06fb __exceptionPreprocess + 331
1 libobjc.A.dylib 0x000000010fd63ac5 objc_exception_throw + 48
2 CoreFoundation 0x00000001118c0555 +[NSException raise:format:] + 197
3 QuartzCore 0x00000001149632ae _ZN2CA5Layer12set_positionERKNS_4Vec2IdEEb + 140
4 QuartzCore 0x000000011495268b -[CALayer setPosition:] + 57
5 QuartzCore 0x0000000114952de3 -[CALayer setFrame:] + 560
6 PDFKit 0x00000001106c7097 -[PDFPageLayerTile initWithFrame:forPageLayer:withRenderingTransform:tileContentsScale:generationID:] + 168
7 PDFKit 0x00000001106cc805 -[PDFPageLayer _updateTiles] + 3439
8 PDFKit 0x00000001106c7d8e -[PDFPageLayer setNeedsTilesUpdate] + 87
9 PDFKit 0x00000001106dc97d -[PDFPageView setNeedsTilesUpdate] + 48
10 PDFKit 0x00000001106de816 -[PDFPageView setFrame:] + 334
11 PDFKit 0x00000001106d511c -[PDFDocumentView createPageViewForPageAtIndex:] + 764
12 PDFKit 0x00000001106d6326 -[PDFDocumentView updateVisibility] + 1726
13 PDFKit 0x000000011074576f -[PDFView resizeDisplayView:] + 517
14 PDFKit 0x000000011073ecdf -[PDFView layoutDocumentView] + 464
15 PDFKit 0x000000011073a36a -[PDFView setDocument:waitDuration:] + 1246
16 PDFKitDemo 0x000000010f4833b3 $s10PDFKitDemo14ViewControllerC11viewDidLoadyyF + 2147
17 PDFKitDemo 0x000000010f483874 $s10PDFKitDemo14ViewControllerC11viewDidLoadyyFTo + 36
18 UIKitCore 0x000000011666843b -[UIViewController loadViewIfRequired] + 1183
19 UIKitCore 0x0000000116668868 -[UIViewController view] + 27
20 UIKitCore 0x0000000116ca0c33 -[UIWindow addRootViewControllerViewIfPossible] + 122
21 UIKitCore 0x0000000116ca1327 -[UIWindow _setHidden:forced:] + 289
22 UIKitCore 0x0000000116cb3f86 -[UIWindow makeKeyAndVisible] + 42
23 UIKitCore 0x0000000116c63f1c -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4555
24 UIKitCore 0x0000000116c690c6 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1617
25 UIKitCore 0x00000001164ae6d6 __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 904
26 UIKitCore 0x00000001164b6fce +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
27 UIKitCore 0x00000001164ae2ec -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 236
28 UIKitCore 0x00000001164aec48 -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 1091
29 UIKitCore 0x00000001164acfba __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 782
30 UIKitCore 0x00000001164acc71 -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 433
31 UIKitCore 0x00000001164b19b6 __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 576
32 UIKitCore 0x00000001164b2610 _performActionsWithDelayForTransitionContext + 100
33 UIKitCore 0x00000001164b171d -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 223
34 UIKitCore 0x00000001164b66d0 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392
35 UIKitCore 0x0000000116c679a8 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 514
36 UIKitCore 0x000000011681edfa -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 361
37 FrontBoardServices 0x000000011cb5b125 -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 448
38 FrontBoardServices 0x000000011cb64ed6 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 283
39 FrontBoardServices 0x000000011cb64700 __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 53
40 libdispatch.dylib 0x0000000112c53db5 _dispatch_client_callout + 8
41 libdispatch.dylib 0x0000000112c572ba _dispatch_block_invoke_direct + 300
42 FrontBoardServices 0x000000011cb96146 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
43 FrontBoardServices 0x000000011cb95dfe -[FBSSerialQueue _performNext] + 451
44 FrontBoardServices 0x000000011cb96393 -[FBSSerialQueue _performNextFromRunLoopSource] + 42
45 CoreFoundation 0x0000000111827be1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
46 CoreFoundation 0x0000000111827463 __CFRunLoopDoSources0 + 243
47 CoreFoundation 0x0000000111821b1f __CFRunLoopRun + 1231
48 CoreFoundation 0x0000000111821302 CFRunLoopRunSpecific + 626
49 GraphicsServices 0x0000000119d422fe GSEventRunModal + 65
50 UIKitCore 0x0000000116c6aba2 UIApplicationMain + 140
51 PDFKitDemo 0x000000010f484a6b main + 75
52 libdyld.dylib 0x0000000112cc8541 start + 1
53 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
推荐答案
不是确切原因，但是通过添加方法 viewDidLayoutSubviews ，它解决了崩溃问题.
Don't the exact reason but by adding the method viewDidLayoutSubviews, it's fixed the crash problem.
现在，工作代码为
override func viewDidLoad() {
super.viewDidLoad()
// Prepare document to show
let url = Bundle.main.url(forResource: "sample", withExtension: "pdf")
let pdfDocument = PDFDocument(url: url!)
// PDFView
pdfView = PDFView()
pdfView.autoScales = true
pdfView.document = pdfDocument
// Add PDFView to viewController
self.view.addSubview(pdfView)
}
override func viewDidLayoutSubviews() {
pdfView.frame = self.view.frame
}
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