由於未捕獲的異常'NSInternalInconsistencyException'而終止應用程序，原因：'僅在主線程上運行！'

Question

我正在跟蹤應用程序中的崩潰。這個特殊的崩潰給我錯誤「終止應用程序，由於未捕獲的異常'NSInternalInconsistencyException'，原因：'只能在主線程上運行！'」。奇怪的是我似乎無法使用我的設備或模擬器重新創建崩潰，但在我的分析中，它表明這次崩潰發生了很多。

這是代碼在碰撞發生的事情：

indicator.startAnimation() 
let audioData = NSData(contentsOfURL: EditSongViewController.url.urlComplete!) 
let dataImage: NSData = UIImageJPEGRepresentation(songImage.image!, 1.0)! 

let imageFile = PFFile(name: "photo.jpg", data: dataImage) 
let audioFile = PFFile(name: "song.mp4", data: audioData) 
audioFile.saveInBackground() 
imageFile.saveInBackground() 

let testObject = PFObject(className: "PrivateSongs") 
testObject["songFile"] = audioFile 
testObject["image"] = imageFile 
testObject["username"] = PFUser.currentUser().username 
testObject["user"] = PFUser.currentUser() 
testObject["title"] = self.songTitleText.text 
testObject["songInfo"] = self.songInfoText.text 
if RecordViewController.fileURL.songLyrics != nil { 
    testObject["lyrics"] = RecordViewController.fileURL.songLyrics 
} 
if (isPrivate == true) { 
    testObject["isPrivate"] = true 
} else { 
    testObject["isPrivate"] = false 
} 

testObject.saveInBackgroundWithBlock ({ (success, error) -> Void in 
    if (success) { 

     if self.chartsSwitch.on { 
      let chart = PFObject(className: "Songs") 
      chart["artistName"] = PFUser.currentUser().username 
      chart["songFile"] = audioFile 
      chart["title"] = self.songTitleText.text 
      chart["picture"] = imageFile 
      chart["user"] = PFUser.currentUser() 
      chart["likes"] = 0 
      if RecordViewController.fileURL.songLyrics != nil { 
       chart["lyrics"] = RecordViewController.fileURL.songLyrics 
      } 
      chart.saveInBackground() 

     } 
     PostViewControler.share.shareUrl = audioFile.url! 
     self.postButton.hidden = true 
     self.addPictureButton.hidden = true 
     self.indicator.stopAnimation(false, completion: nil) 
     self.navigationController!.pushViewController(self.storyboard!.instantiateViewControllerWithIdentifier("ShareViewController") , animated: true) 

    } else { 
     self.indicator.stopAnimation(false, completion: nil) 
     self.helper.showErrorAlert("Couldn't save your song please try again.") 
    } 
}) 

Answer 1

的錯誤消息是Only run on the main thread!。原因是你在後臺線程中更新UI（testObject.saveInBackgroundWithBlock ({ (success, error) -> Void in）。檢查您的更新UI任務，如隱藏按鈕，停止動畫，導航...，並將其移至主線程。

dispatch_async(dispatch_get_main_queue(), ^{ 
/* Your UI code */ 
});