領域與RLMException崩潰：對象已被刪除或無效

Question

我有一個領域模型，存儲時間線（我正在製作視頻編輯應用程序），並且相當頻繁地粉碎訪問它的RMArray屬性。該應用程序已發貨，我自己也沒有經歷過，但我的粉絲們經常通知我這次崩潰。這裏是崩潰日誌：

Fatal Exception: RLMException 
Object has been deleted or invalidated. 

Thread : Fatal Exception: RLMException 
0 CoreFoundation     0x2614d45f __exceptionPreprocess + 126 
1 libobjc.A.dylib    0x3407ec8b objc_exception_throw + 38 
2 VideoEditor    0x00293919 RLMGetArray(RLMObjectBase*, unsigned int, NSString*) (RLMRealm_Private.hpp:38) 
3 VideoEditor    0x0018a1b4 VideoEditor.RLMProject.setTimeLineModel (VideoEditor.RLMProject)(VideoEditor.TimeLineModel, beginWriteTransaction : Swift.Bool) ->() (RealmModels.swift:147) 
4 VideoEditor    0x0025eb9c VideoEditor.VideoEditorAPI.saveProject (VideoEditor.VideoEditorAPI)(Swift.Optional<VideoEditor.IProject>, timeLine : VideoEditor.TimeLineModel, name : Swift.String, filterID : Swift.Int, image : ObjectiveC.UIImage) -> Swift.ImplicitlyUnwrappedOptional<VideoEditor.IProject> (VideoEditorAPI.swift:42) 
5 VideoEditor    0x00164754 @objc VideoEditor.ProjectEditorViewController.saveProject (VideoEditor.ProjectEditorViewController)(Swift.ImplicitlyUnwrappedOptional<ObjectiveC.NSNotification>) ->() (ProjectEditorViewController.swift:514) 
6 CoreFoundation     0x26105e31 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 
7 CoreFoundation     0x260616cd _CFXNotificationPost + 1784 
8 Foundation      0x26db7dd9 -[NSNotificationCenter postNotificationName:object:userInfo:] + 72 
9 UIKit       0x296cae2d -[UIApplication _deactivateForReason:notify:] + 528 
10 UIKit       0x298d2dd7 -[UIApplication _handleNonLaunchSpecificActions:forScene:withTransitionContext:] + 1846 
11 UIKit       0x298caafd -[UIApplication workspace:didReceiveActions:] + 80 
12 FrontBoardServices    0x2ca180a9 __31-[FBSSerialQueue performAsync:]_block_invoke + 12 
13 CoreFoundation     0x26113fe5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12 
14 CoreFoundation     0x261132a9 __CFRunLoopDoBlocks + 216 
15 CoreFoundation     0x26111de3 __CFRunLoopRun + 1714 
16 CoreFoundation     0x2605f3b1 CFRunLoopRunSpecific + 476 
17 CoreFoundation     0x2605f1c3 CFRunLoopRunInMode + 106 
18 GraphicsServices    0x2d5bf201 GSEventRunModal + 136 
19 UIKit       0x296c943d UIApplicationMain + 1440 
20 MerryVideoEditor    0x0028c88f main (main.m:16) 
21 libdyld.dylib     0x3460aaaf start + 2 

這裏是RLMProject代碼：

protocol IProject{ 
    var name: String { get set } 
    var filterID: Int { get set } 
    var filterIntensity: CGFloat { get set } 

    /// duration in seconds 
    var duration: Int { get set } 
    var dateCreated: NSDate { get } 

    func setTimeLineModel(timeLine: TimeLineModel, beginWriteTransaction: Bool) 

    // should be done by ProjectImporter 
    func getTimeLineModel() -> TimeLineModel 

    var videoAssets: RLMArray { get } 
    var soundtracks: RLMArray { get }  
} 

class RLMProject: RLMObject, IProject, Printable { 
    dynamic var videoAssets: RLMArray = RLMArray(objectClassName: RLMMediaAsset.className()) 
    dynamic var soundtracks: RLMArray = RLMArray(objectClassName: RLMMediaAsset.className()) 

    dynamic var name: String = "" 

    dynamic var filterID: Int = 0 
    dynamic var filterIntensity: CGFloat = 1 

    dynamic var duration: Int = 0 
    dynamic var dateCreated: NSDate = NSDate() 

    dynamic var idValue: Int = 0 

    func setTimeLineModel(timeLine: TimeLineModel, beginWriteTransaction: Bool = true) { 
     func updateArray(array: RLMArray, withAssetsArray assetsArray: [MediaAsset], type: MediaType){ 
     array.removeAllObjects() 
     for asset in assetsArray{ 
      let model = RLMMediaAsset() 
      model.setMediaAsset(asset) 
      model.setType(type) 
      array.addObject(model) 
      RLMRealm.defaultRealm().addObject(model) 
     } 
     } 
     if beginWriteTransaction { RLMRealm.defaultRealm().beginWriteTransaction() } 

     if videoAssets.invalidated { videoAssets = RLMArray(objectClassName: RLMMediaAsset.className()) } 
     if soundtracks.invalidated { soundtracks = RLMArray(objectClassName: RLMMediaAsset.className()) } 

     updateArray(videoAssets, withAssetsArray: timeLine.videoAssets, .Video) 
     updateArray(soundtracks, withAssetsArray: timeLine.soundtracks, .Soundtrack) 
     duration = Int(CMTimeGetSeconds(timeLine.totalDuration)) 

     dateCreated = NSDate() 
     if beginWriteTransaction { RLMRealm.defaultRealm().commitWriteTransaction() } 
    } 

    func getTimeLineModel() -> TimeLineModel { 
     let timeLine = TimeLineModel() 
     timeLine.videoAssets = videoAssets.map { ($0 as RLMMediaAsset).getMediaAsset() } 
     timeLine.soundtracks = soundtracks.map { ($0 as RLMMediaAsset).getMediaAsset() } 

     return timeLine 
    } 
} 

extension RLMArray { 
    func map<U>(transform: (RLMObject) -> U) -> [U]{ 
     var array: [U] = [] 
     for object in self{ 
      array.append(transform(object)) 
     } 
     return array 
    } 
} 

有誰有一個想法是什麼錯我的代碼？

Answer 1

當RLMProject本身是無效的，這將是不可能的檢查videoAssets.invalidated或soundtracks.invalidated，這就是爲什麼你的堆棧跟蹤顯示未捕獲的異常在RLMGetArray被拋出。

這意味着在您致電setTimeLineModel之前，該對象已從領域中刪除。請在代碼中查找realm.deleteObject(_:)以查看可能發生的情況。

最後，一些一般性的提示，使您的代碼變得更安全，更簡單：

而不是到處RLMRealm.defaultRealm()你RLMObject裏面，你應該使用它的realm屬性。這樣，如果您決定在某個時候更改您的領域的位置，您的RLMObject中的代碼將繼續工作。

另外，您可以使用Swift的免費map函數，而不是在RLMArray上創建擴展來添加地圖。

map(videoAssets) { ($0 as RLMMediaAsset).getMediaAsset() }