当尝试再次查看pdf文件时，从不正确的线程访问的领域Swift 3

-1

我有收藏视图，用户可以点击下载pdf文件。如果下载完成，它会显示pdf文件。但经过PDF出现了，回去然后再次点击细胞再次显示PDF格式，它抛出Realm accessed from incorrect thread.当尝试再次查看pdf文件时，从不正确的线程访问的领域Swift 3

这里是我的代码来下载文件：

func downloadData(_ magazineObject: Magazine, cell: magazineCell) { 
Alamofire.download(magazineObject.urlMagazine, method: .get, encoding: JSONEncoding.default, to: destination) 
     .downloadProgress(queue: DispatchQueue.global(qos: .utility)) { progress in 
      DispatchQueue.main.async() { 
       self.percentProgressFinal = Float(progress.fractionCompleted) 

       magazineObject.progressBarDownload = progress.fractionCompleted.roundToPlaces(places: 2) 
       magazineObject.progressBarTitle = Float(self.displayFinalLabelPercent).cleanValue 

      } 
     } 
     .validate { request, response, temporaryURL, destinationURL in 
      self.localPath = destinationURL 
      magazineObject.pathDatabase = String(describing: self.localPath!) 
      magazineObject.progressBarDownload = Double(self.percentProgressFinal) 
      magazineObject.progressBarTitle = Float(self.displayFinalLabelPercent).cleanValue 
      magazineObject.statusDarkViewAfterRelaunch = 1 

       let mainStoryBoard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil) 
       let vc:PDFKBasicPDFViewer = mainStoryBoard.instantiateViewController(withIdentifier: "NEXT") as! PDFKBasicPDFViewer 
       let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 
       let filePath = "\(documentsPath)/\(magazineObject.title).pdf" 

       let document: PDFKDocument = PDFKDocument(contentsOfFile: filePath, password: nil) 
       vc.loadDocument(document) 

       self.navigationController?.pushViewController(vc, animated: true) 

      magazineObject.statusDownload = self.statusDatabase 

      let realm = try! Realm() 

      try! realm.write { 
       realm.add(magazineObject) 
      } 

      return .success 
    } 
}

，并显示该文件，如果已经下载：

if statusGlobal { 
     if magazineObject.statusDownload == 0 { 
      magazineObject.statusDownload = 1 

      //Alamofire Request 
      downloadData(magazineObject, cell: cell) 

      cell.progressDownload.isHidden = false 
      cell.progressLabel.isHidden = false 

     } else { 
      let mainStoryBoard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil) 
      let vc:PDFKBasicPDFViewer = mainStoryBoard.instantiateViewController(withIdentifier: "NEXT") as! PDFKBasicPDFViewer 
      let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 
      let filePath = "\(documentsPath)/\(magazineObject.title).pdf" 
      let document: PDFKDocument = PDFKDocument(contentsOfFile: filePath, password: nil) 
      vc.loadDocument(document) 

      self.navigationController?.pushViewController(vc, animated: true) 
     } 
    } 
}

但如果我重新运行模拟器，它可以显示我的pdf文件。

来源

2016-12-29 Ariel Gemilang

是你的代码上面你得到一个'Realm'和使用它的_only_地方提供解决呢？ – AustinZ

是的，这是我获得Realm并使用它的唯一地方 –

我通过创建另一个变量

let newMagazineObject = Magazine() 
      newMagazineObject.id = magazineObject.id 
      newMagazineObject.pathDatabase = magazineObject.pathDatabase 
      newMagazineObject.progressBarDownload = magazineObject.progressBarDownload 
      newMagazineObject.progressBarTitle = magazineObject.progressBarTitle 
      newMagazineObject.statusDarkViewAfterRelaunch = magazineObject.statusDarkViewAfterRelaunch 
      newMagazineObject.statusDownload = magazineObject.statusDownload 

      let realm = try! Realm() 
      try! realm.write { 
       realm.add(newMagazineObject) 
      }

来源

2017-01-09 09:18:27

使用Xcode's exception breakpoints来设置抛出的C++异常的断点，然后查看堆栈跟踪的“不正确线程”异常抛出的位置，以查看代码的哪一行触发异常。从那里，你应该能够确定哪个Realm对象不正确地跨线程共享。

来源

2017-01-03 18:23:06 bdash

当尝试再次查看pdf文件时，从不正确的线程访问的领域Swift 3

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