由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'仅在主线程上运行！'

Question

我正在跟踪应用程序中的崩溃。这个特殊的崩溃给我错误“终止应用程序，由于未捕获的异常'NSInternalInconsistencyException'，原因：'只能在主线程上运行！'”。奇怪的是我似乎无法使用我的设备或模拟器重新创建崩溃，但在我的分析中，它表明这次崩溃发生了很多。

这是代码在碰撞发生的事情：

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

的错误消息是Only run on the main thread!。原因是你在后台线程中更新UI（testObject.saveInBackgroundWithBlock ({ (success, error) -> Void in）。检查您的更新UI任务，如隐藏按钮，停止动画，导航...，并将其移至主线程。

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