Question

我对Swift还是很陌生-在完成在PDFView中显示文档这一简单任务时遇到了一些麻烦。我不使用情节提要或IBOutlets等。为什么以下内容崩溃了？

我尝试引用外部链接，但这给了我同样的错误。 PDF位于捆绑目录中。

导入UIKit 导入PDFKit

ViewController类：UIViewController {

private var pdfView = PDFView()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    let myNewView = PDFView(frame: CGRect(x: 10, y: 100, width: 500, height: 500))

    // Add border to UIView
    myNewView.layer.borderWidth=2

    // Change UIView Border Color to Red
    myNewView.layer.borderColor = UIColor.red.cgColor

    guard let path = Bundle.main.path(forResource: "CV", ofType: "pdf") else { return }
    let url = URL(fileURLWithPath: path)
    let document = PDFDocument(url: url)
    myNewView.document = document

    // Add UIView as a Subview
    self.view.addSubview(myNewView)
}

}

构建成功。但我得到以下内容。

2019-06-13 17：49：35.702174 + 0100 Appp [81235：19343962] *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]” * 第一个调用堆栈：（ 0 CoreFoundation 0x00000001083446fb exceptionPreprocess + 331 1 libobjc.A.dylib 0x0000000106250ac5 objc_exception_throw + 48 2 CoreFoundation 0x0000000108344555 + [NSException提高：格式：] + 197 3 QuartzCore 0x000000010b4072ae _ZN2CA5Layer12set_positionERKNS_4Vec2IdEEb + 140 4 QuartzCore 0x000000010b3f668b-[CALayer setPosition：] + 57 5 QuartzCore 0x000000010b3f6de3-[CALayer setFrame：] + 560 6 PDFKit 0x0000000107135097-[PDFPageLayerTile initWithFrame：forPageLayer：withRenderingTransform：tileContentsScale：generationID：] + 168 7 PDFKit 0x000000010713a805-[PDFPageLayer _updateTiles] + 3439 8 PDFKit 0x0000000107135d8e-[PDFPageLayer setNeedsTilesUpdate] + 87 9 PDFKit 0x000000010714a97d-[PDFPageView setNeedsTilesUpdate] + 48 10 PDFKit 0x000000010714c816-[PDFPageView setFrame：] + 334 11 PDFKit 0x000000010714311c-[PDFDocumentView createPageViewForPageAtIndex：] + 764 12 PDFKit 0x0000000107144326-[PDFDocumentView更新可见性] + 1726 13 PDFKit 0x00000001071b376f-[PDFView resizeDisplayView：] + 517 14 PDFKit 0x00000001071accdf-[PDFView layoutDocumentView] + 464 15 PDFKit 0x00000001071a836a-[PDFView setDocument：waitDuration：] + 1246 16附录0x000000010596c4d1 $ s7Appp14ViewControllerC11viewDidLoadyyF + 1441 17附录0x000000010596c7b4 $ s7Appp14ViewControllerC11viewDidLoadyyFTo + 36 18 UIKitCore 0x000000010d0ec43b-[UIViewController loadViewIfRequired] + 1183 19 UIKitCore 0x000000010d0ec868-[UIViewController视图] + 27 20 UIKitCore 0x000000010d724c33-[UIWindow addRootViewControllerViewIfPossible] + 122 21 UIKitCore 0x000000010d725327-[UIWindow setHidden：forced：] + 289 22 UIKitCore 0x000000010d737f86-[UIWindow makeKeyAndVisible] + 42 23 UIKitCore 0x000000010d6e7f1c-[UIApplication _callInitializationDelegatesForMainScene：transitionContext：] + 4555 24 UIKitCore 0x000000010d6ed0c6-[UIApplication _runWithMainScene：transitionContext：completion：] + 1617 25 UIKitCore 0x000000010cf326d6 __111-[__ UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene：transition：firstActivation：completion：] _ block_invoke + 904 26 UIKitCore 0x000000010cf3afce + [_ UICanvas _enqueuePostSettingUpdateTransactionBlock：] + 153 27 UIKitCore 0x000000010cf322ec-[__ UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene：transition：firstActivation：completion：] + 236 28 UIKitCore 0x000000010cf32c48-[__ UICanvasLifecycleMonitor_Compatability activateEventsOnly：withContext：completion：] + 1091 29 UIKitCore 0x000000010cf30fba __82-[_ UIApplicationCanvas _transitionLifecycleStateWithTransitionContext：completion：] _ block_invoke + 782 30 UIKitCore 0x000000010cf30c71-[_ UIApplicationCanvas _transitionLifecycleStateWithTransitionContext：completion：] + 433 31 UIKitCore 0x000000010cf359b6 __125-[_ UICanvasLifecycleSettingsDiffAction performActionsForCanvas：withUpdatedScene：settingsDiff：fromSettings：transitionContext：] _ block_invoke + 576 32 UIKitCore 0x000000010cf36610 _performActionsWithDelayForTransitionContext + 100 33 UIKitCore 0x000000010cf3571d-[_ UICanvasLifecycleSettingsDiffAction performActionsForCanvas：withUpdatedScene：settingsDiff：fromSettings：transitionContext：] + 223 34 UIKitCore 0x000000010cf3a6d0-[_ UICanvas场景：didUpdateWithDiff：transitionContext：完成：] + 392 35 UIKitCore 0x000000010d6eb9a8-[UIApplication工作区：didCreateScene：withTransitionContext：completion：] + 514 36 UIKitCore 0x000000010d2a2dfa-[UIApplicationSceneClientAgent场景：didInitializeWithEvent：完成：] + 361 37 FrontBoardServices 0x00000001135df125-[FBSSceneImpl _didCreateWithTransitionContext：completion：] + 448 38 FrontBoardServices 0x00000001135e8ed6 __56- [FBSWorkspace客户端：handleCreateScene：withCompletion：] _ block_invoke_2 + 283 39 FrontBoardServices 0x00000001135e8700 __40- [FBSWorkspace _performDelegateCallOut：] _ block_invoke + 53 40 libdispatch.dylib 0x00000001096d7db5 _dispatch_client_callout + 8 41 libdispatch.dylib 0x00000001096db2ba _dispatch_block_invoke_direct + 300 42 FrontBoardServices 0x000000011361a146 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 30 43 FrontBoardServices 0x0000000113619dfe-[FBSSerialQueue _performNext] + 451 44 FrontBoardServices 0x000000011361a393-[FBSSerialQueue _performNextFromRunLoopSource] + 42 45 CoreFoundation 0x00000001082abbe1 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 46 CoreFoundation 0x00000001082ab463 __CFRunLoopDoSources0 + 243 47 CoreFoundation 0x00000001082a5b1f __CFRunLoopRun + 1231 48 CoreFoundation 0x00000001082a5302 CFRunLoopRunSpecific + 626 49图形服务0x00000001107c62fe GSEventRunModal + 65 50个UIKitCore 0x000000010d6eeba2 UIApplicationMain + 140 51 Appp 0x000000010596f68b主+ 75 52 libdyld.dylib 0x000000010974c541开始+ 1 53 ??? 0x0000000000000001 0x0 + 1 ） libc ++ abi.dylib：以类型为NSException的未捕获异常终止（lldb）

Answer 1

如果将myNewView.document = document而不是viewDidAppear:移到viewDidLoad，则文档将加载而不会出现问题。

不幸的是，iOS在12.1和12.2之间进行了更改，因此有必要。

将文档附加到PDFView时SIGABRT崩溃

1 个答案: