下載完成後從不正確的線程訪問的領域Swift 3

Question

我有一個應用程序，用戶可以下載pdf文件。我最近搬到alamofire 4，迅速3.我嘗試查看PDF文件下載完成之後，但它扔Realm accessed from incorrect thread.

這裏是我的代碼：

Alamofire.download(url, method: .get, encoding: JSONEncoding.default, to: destination) 
     .downloadProgress(queue: DispatchQueue.global(qos: .utility)) { progress in 

      DispatchQueue.main.async { 
       magazineObject.progressBarDownload = self.percentProgress 
       magazineObject.progressBarTitle = self.percentProgressNext.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 
      magazineObject.statusDownload = self.statusDatabase 

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

Answer 1

嘗試創建validate塊內的另一個境界線程對象

.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 
    magazineObject.statusDownload = self.statusDatabase 

    // create new object here 
    let realm = try! Realm() 

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

您可以在境界文檔https://realm.io/docs/swift/latest/#using-a-realm-across-threads