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[已解决]swift中代码运行出错:This application is modifying the autolayout engine from a background thread

Swift crifan 1860浏览 0评论

代码:

import QuickLook
                let openFileVC = OpenFileViewController(fullFilePath:fullFilePath)
//                self.showViewController(openFileVC, sender: self)
                let previewController = QLPreviewController()
                previewController.delegate = openFileVC
                previewController.dataSource = openFileVC
                self.showViewController(previewController, sender: self)
import UIKit
import QuickLook
class OpenFileViewController: UIViewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate{
//class OpenFileViewController: UIViewController, QLPreviewControllerDataSource, UIDocumentInteractionControllerDelegate{
   
//    let dic:UIDocumentInteractionController
    let fileUrl:NSURL
   
//    init(fileUrl:NSURL){
    init(fullFilePath:String){
        self.fileUrl = NSURL.fileURLWithPath(fullFilePath)
        print("self.fileUrl=\(self.fileUrl)")
        //self.fileUrl=file:///Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/C9EAE23F-BCF3-4C2E-9D90-DD282CE8FBB2/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/%E5%BC%A0%E7%82%B3%E6%81%8B-%E8%AE%BE%E8%AE%A1.docx
//        self.dic = UIDocumentInteractionController(URL: self.fileUrl)
        super.init(nibName: nil, bundle: nil)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
   
    func numberOfPreviewItemsInPreviewController(controller: QLPreviewController) -> Int {
        return 1
    }
   
    func previewController(controller: QLPreviewController, previewItemAtIndex index: Int) -> QLPreviewItem {
        return self.fileUrl
    }
   
    override func viewDidLoad() {
        super.viewDidLoad()
       
    }
}

出错:

This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes.  This will cause an exception in a future release.
2016-01-19 11:39:51.976 JianDao[22569:1282566] Cannot find preview item for proxy: <QLPreviewItemProxy: 0x7d8a3a90> – 张炳恋-设计.docx (0)
respData==readOutData = true
2016-01-19 11:39:58.906 JianDao[22569:1282674] *** Assertion failure in -[UIApplication _cachedSystemAnimationFenceCreatingIfNecessary:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.30.14/UIApplication.m:1712
2016-01-19 11:39:58.922 JianDao[22569:1282674] *** Terminating app due to uncaught exception ‘NSInternalInconsistencyException’, reason: ‘accessing _cachedSystemAnimationFence requires the main thread’
*** First throw call stack:
(
    0   CoreFoundation                      0x0140da14 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x0379de02 objc_exception_throw + 50
    2   CoreFoundation                      0x0140d8aa +[NSException raise:format:arguments:] + 138
    3   Foundation                          0x01a4fd26 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 118
    4   UIKit                               0x022c2dc0 -[UIApplication _cachedSystemAnimationFenceCreatingIfNecessary:] + 212
    5   UIKit                               0x022c2ea6 -[UIApplication _systemAnimationFenceCreatingIfNecessary:] + 43
    6   UIKit                               0x02358891 +[UIWindow _synchronizedDrawingFence] + 117
    7   UIKit                               0x02bd8e16 -[_UIRemoteViewController synchronizeAnimationsInActions:] + 129
    8   UIKit                               0x02bdcc66 -[_UIRemoteViewController viewWillAppear:] + 1179
    9   QuickLook                           0x0215b8e1 -[QLPreviewController viewWillAppear:] + 198
    10  UIKit                               0x0249fd37 -[UIViewController _setViewAppearState:isAnimating:] + 659
    11  UIKit                               0x024a0427 -[UIViewController __viewWillAppear:] + 147
    12  UIKit                               0x024c35b9 -[UIViewController(UIContainerViewControllerProtectedMethods) beginAppearanceTransition:animated:] + 202
    13  UIKit                               0x024d59cc -[UINavigationController _startCustomTransition:] + 1389
    14  UIKit                               0x024e7769 -[UINavigationController _startDeferredTransitionIfNeeded:] + 803
    15  UIKit                               0x024e8ada -[UINavigationController __viewWillLayoutSubviews] + 68
    16  UIKit                               0x026c4c4a -[UILayoutContainerView layoutSubviews] + 252
    17  UIKit                               0x0fb56d8a -[UILayoutContainerViewAccessibility layoutSubviews] + 50
    18  UIKit                               0x0239a008 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 810
    19  libobjc.A.dylib                     0x037b2059 -[NSObject performSelector:withObject:] + 70
    20  QuartzCore                          0x0204180a -[CALayer layoutSublayers] + 144
    21  QuartzCore                          0x020354ee _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 388
    22  QuartzCore                          0x02035352 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
    23  QuartzCore                          0x02027e8b _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 317
    24  QuartzCore                          0x0205be03 _ZN2CA11Transaction6commitEv + 561
    25  QuartzCore                          0x0205c1ab _ZN2CA11Transaction14release_threadEPv + 289
    26  libsystem_pthread.dylib             0x047ebf54 _pthread_tsd_cleanup + 537
    27  libsystem_pthread.dylib             0x047ebad9 _pthread_exit + 108
    28  libsystem_pthread.dylib             0x047ec536 pthread_get_stackaddr_np + 0
    29  libsystem_pthread.dylib             0x047e9f72 start_wqthread + 34
)
libc++abi.dylib: terminating with uncaught exception of type NSException

如图:

改为:

                let fullFilePath = fullUrl!.path!
                print("fullFilePath=\(fullFilePath)")
                //fullFilePath=/Users/crifan/Library/Developer/CoreSimulator/Devices/84FE8057-ED19-4703-BAE0-7C5156289534/data/Containers/Data/Application/C9EAE23F-BCF3-4C2E-9D90-DD282CE8FBB2/Documents/user-e85906ff-aca6-457f-af46-793e46b51c71/张炳恋设计.docx
                dispatch_async(dispatch_get_main_queue(), { () -> Void in
//                let openFileVC = OpenFileViewController(fileUrl: NSURL(fileURLWithPath: self.fileItem.downloadedFilename, relativeToURL: docDirUrl))
//                let openFileVC = OpenFileViewController(fileUrl:fullUrl!)
                   
                    let openFileVC = OpenFileViewController(fullFilePath:fullFilePath)
                    //                self.showViewController(openFileVC, sender: self)
                    let previewController = QLPreviewController()
                    previewController.delegate = openFileVC
                    previewController.dataSource = openFileVC
                   
                    self.showViewController(previewController, sender: self)
                })

至少可以显示视图了

虽然内容是空白:

去确认,此处要打开的文件是正常的文件。

有去打开别的文件,结果也是空白:

[基本解决]用QLPreviewController打开预览文件但是显示空白

转载请注明:在路上 » [已解决]swift中代码运行出错:This application is modifying the autolayout engine from a background thread

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