从 API 获取数据时，iOS 应用程序在滚动时崩溃

Question

我使用 tableView 来显示帖子，当我滚动页面时，它有时会崩溃并抛出错误：由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因：'无效更新：无效的行数第 0 节。更新后现有节中包含的行数 (119) 必须等于更新前该节中包含的行数 (105)，加上或减去从该节中插入或删除的行数（1 个插入，1 个删除）加上或减去移入或移出该部分的行数（0 移入，0 移出）。'我无法找出它发生的原因 p>

func getFeeds(){
    DispatchQueue.main.async {
        if(self.isCommentsOpened == false && self.spinner == nil && !self.isPaginating && self.isScrollingUp == false){
        self.spinner = CommonUtils.showLoader(view: self)
        }
    }
     var paramsDictionary = [String:Any]()
            let xAuthToken:String=UserDefaults.standard.string(forKey: JsonContants.X_AUTH_TOKEN)!
            let entityId:String=UserDefaults.standard.string(forKey: JsonContants.ENTITY_ID)!
            var apiUrl=domains.global+Apis.feedQueryApi
            apiUrl=apiUrl.replacingOccurrences(of: "{entity_id}", with: entityId)
            if(isPaginating && pageNo<totalPages){
            paramsDictionary[JsonContants.PAGE_NO] = pageNo+1
            paramsDictionary[JsonContants.PAGE_SIZE] = pageSize
            }else{
                paramsDictionary[JsonContants.PAGE_NO] = 1
                paramsDictionary[JsonContants.PAGE_SIZE] = pageSize
            }
            HttpClientApi.instance().makeAPICall(token: xAuthToken,refreshToken: "",url:  apiUrl, params:paramsDictionary, method: .POST, success: { (data, response, error) in
                do {
                    if let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] {
                        let httpStatus=response as HTTPURLResponse!
                        let statusCode=httpStatus?.statusCode
                        let pageDetails = json[JsonContants.PAGE_DETAILS] as! [String:Any]
                        if(pageDetails.count>0){
                            self.pageNo =  pageDetails[JsonContants.PAGE_NO] as! Int
                            self.pageSize =  pageDetails[JsonContants.PAGE_SIZE] as! Int
                            self.totalPages = pageDetails[JsonContants.TOTAL_PAGES] as! Int
                        }
                        let feedsArray = json[JsonContants.FEEDS] as! Array<Dictionary<String, Any>>
                        if(!self.isPaginating){
                            self.feedsJsonArray = feedsArray
                            self.feedIdsArray = [String]()
                            self.feedIdUserIdDict = [String:String]()
                            self.userIdUserJsonDict = [String:[String:Any]]()
                            self.imagesJsonArray = []
                            self.feedIdActivityJsonDict = [String:[[String:Any]]]()
                        }else{
                            self.paginationFeedIdsArray = [String]()
                            self.feedsJsonArray.append(contentsOf: feedsArray)
                        }
                        var paginationUserIdDict = [String]()
                        for object:Dictionary<String,Any> in feedsArray{
                            let feedId=object[JsonContants.FEED_ID] as? String
                            self.feedIdsArray.append(feedId!)
                            let userId = object[JsonContants.USER_ID] as? String
                            self.feedIdUserIdDict[feedId!] = userId
                            if(self.isPaginating){
                            paginationUserIdDict.append(userId!)
                            self.paginationFeedIdsArray.append(feedId!)
                            }
                        }
                         DispatchQueue.main.async {
                        if(!self.isPaginating){
                        self.getUserList(userIds: Array(self.feedIdUserIdDict.values))
                            self.dismissLoader()
                        }else{
                            self.getUserList(userIds: paginationUserIdDict)
                            self.dismissLoader()
                            }
                        }
                    }
                } catch let error {
                    print(error.localizedDescription)
                    DispatchQueue.main.async {
                        if(self.spinner != nil){
                        self.spinner!.dismissLoader()
                        self.spinner = nil
                        }
                        if((self.topScrollSpinnerContainerView.isHidden == false) ||  (self.downScrollSpinnerContainerView.isHidden == false)){
                            self.scrollSpinner!.dismissLoader2()
                            self.topScrollSpinnerContainerView.isHidden = true
                            self.downScrollSpinnerContainerView.isHidden = true
                        }
                    }
                }
                
            }, failure: { (data, response, error) in
                DispatchQueue.main.async {
                    if(self.spinner != nil){
                    self.spinner!.dismissLoader()
                    self.spinner = nil
                    }
                    if((self.topScrollSpinnerContainerView.isHidden == false) ||  (self.downScrollSpinnerContainerView.isHidden == false)){
                        self.scrollSpinner!.dismissLoader2()
                        self.topScrollSpinnerContainerView.isHidden = true
                        self.downScrollSpinnerContainerView.isHidden = true
                    }
                }
                
                print(error?.localizedDescription as Any)
                
            })
}

func showSmallLoaderAtBottom(view: UIView) -> UIView {

        var spinnerView = UIView(frame: CGRect(x: 0, y: 0, width: 50, height:50))
        let spinner = MDCActivityIndicator(frame: CGRect(x: 0, y: 0, width: 50, height:50))
        spinner.cycleColors = [UIColor(named: AppColors.appSkyBlue.rawValue)!, UIColor(named: AppColors.appSkyBlue.rawValue)!,UIColor(named: AppColors.appSkyBlue.rawValue)!,UIColor(named: AppColors.appSkyBlue.rawValue)!]
        spinnerView.addSubview(spinner)
        view.addSubview(spinnerView)
        spinner.startAnimating()
        return spinnerView
        }

func getMoreData(){
    if(self.pageNo < self.totalPages){
        scrollSpinner = showSmallLoaderAtBottom(view: downScrollSpinnerContainerView)
        downScrollSpinnerContainerView.isHidden = false
        isPaginating = true
        self.getFeeds()
    }
}

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    self.currentRow = indexPath.row
    let cell=tableView.dequeueReusableCell(withIdentifier: "feed_tvcell", for: indexPath) as! FeedTableViewCell
    cell.selectionStyle = .none
    cell.feedViewController = self
    cell.feedsStackView.translatesAutoresizingMaskIntoConstraints = false
    
    let feedJson = self.feedsJsonArray[indexPath.row]
    cell.messageTextLabel.numberOfLines = 0
    cell.messageTextLabel.lineBreakMode = .byWordWrapping
    cell.messageTextLabel.sizeToFit()
    if(feedJson[JsonContants.CONTENT] != nil && !(feedJson[JsonContants.CONTENT] as! String).elementsEqual(JsonContants.NA)){
        cell.feedMessageView.isHidden = false
        cell.messageTextLabel.text = (feedJson[JsonContants.CONTENT] as! String).decodeEmoji
    }else{
        cell.feedMessageView.isHidden = true
    }
    let feedId = feedJson[JsonContants.FEED_ID] as! String
    let userId = feedIdUserIdDict[feedId] as! String
    let userJson = userIdUserJsonDict[userId] as? [String:Any]
    var userTitle:[[String:Any]]?
    var lastName:String?
    var firstName:String?
    if(userJson != nil){
        userTitle = userJson![JsonContants.USER_TITLE] as? [[String:Any]]
        lastName = userJson![JsonContants.LAST_NAME] as? String
        firstName = userJson![JsonContants.FIRST_NAME] as? String
    }
    var roles = self.appDefaults.value(forKey: JsonContants.ROLE) as! [String]
    if(firstName != nil){
    cell.feeUserName.text = (firstName as! String)
    }
    if(lastName != nil){
        cell.feeUserName.text = cell.feeUserName.text!+" "+(lastName as! String)
    }
    
    hideAndShowFeedDeleteButton(roles, cell, userId)
    
    addActionTargetsToCellButtons(cell)
    
    var time = feedJson[JsonContants.LAST_ACTIVITY_TIME] as! Int64
    var timeDiff = CommonUtils.getSystemTimeInMillis() - time
    cell.feedTime.text = CommonUtils.getStringValueOfTimeDiff(timeDiff: timeDiff)
    
    setCountZero(cell)
    setLikeCount(feedId, cell, feedJson)
    
    var feedType = feedJson[JsonContants.TYPE] as! String
    
    let feedCommentCount = feedJson[JsonContants.FEED_COMMENT_COUNT] as! Int
    cell.commentCountLabel.text = String(feedCommentCount)
    
    
    if(userJson != nil){
        let userId = userJson![JsonContants.USER_ID] as? String
        var cachedMediaId:UIImage?
        let userJsonFromDb = CoreDataDatabaseManager.coreDataDatabaseManager.getUser(id: userId!)
        if(userJsonFromDb != nil && userJsonFromDb.count>0){
        let imageId = userJsonFromDb[JsonContants.IMAGE_ID] as? String
        if(userId != nil && imageId != nil){
            cachedMediaId  = self.getSavedImage(named : imageId!+"."+"png")
            }
        }
        if(cachedMediaId == nil){
            cell.feedUserImage.image = #imageLiteral(resourceName: "user_default_round")
            getUserImages(userIds: [userId!],cell: cell)
            
        }else{
            cell.feedUserImage.image = cachedMediaId
        }
      
    }else{
        cell.feedUserImage.image = #imageLiteral(resourceName: "user_default_round")
    }
    
    
    if(userJson != nil && userJson![JsonContants.RESIDENT_DETAILS] != nil){
        let residentDetails = userJson![JsonContants.RESIDENT_DETAILS] as! [String:Any]
        let buildingName = residentDetails[JsonContants.BUILDING_NAME] as! String
        let flatName = residentDetails[JsonContants.FLAT_NAME] as! String
        let feedUserName:String = cell.feeUserName.text!
        if(buildingName.count>0 && flatName.count>0){
        cell.feeUserName.text = feedUserName+" - "+buildingName+"("+flatName+")"
        }
    }else if(userTitle != nil && userTitle!.count>0) {
        let titleDict = userTitle![0]
        let name = cell.feeUserName.text
        if(titleDict.count>0){
            var title = titleDict[JsonContants.TITLE] as! String
            if(title.elementsEqual(JsonContants.ADMINISTRATOR)){
            cell.feeUserName.text = name!+" - "+"Admin"
            }
        }
    }
    if(feedType.elementsEqual(JsonContants.SURVEY)){
        let options = feedJson[JsonContants.OPTIONS] as! [[String:Any]]
        setSurveyData(cell, options, feedId, feedJson,indexPath: indexPath)       
        
    }else{
    
    if(feedJson[JsonContants.MEDIA_INFO] != nil && (feedJson[JsonContants.MEDIA_INFO] as! [String:Any]) != nil &&
        (feedJson[JsonContants.MEDIA_INFO] as! [String:Any]).count>0){
       let  mediaJson = feedJson[JsonContants.MEDIA_INFO] as! [String:Any]
        let mediaType = mediaJson[JsonContants.MEDIA_TYPE] as! String
        cell.optionsTableView.isHidden = true
        cell.surveyTotalVotesLabel.isHidden = true
        cell.surveyTotalVotesLabelContainer.isHidden = true
        cell.feedVideoView.isHidden = true
        cell.feedImageView.isHidden = true
        
        if(mediaType.elementsEqual(JsonContants.IMAGE)){
            configureFeedImageViewAndSetImage(cell, mediaJson, feedId,indexPath)
        }else{
            configureFeedMediaViewAndSetVideo(cell, mediaJson, indexPath)
        }
    }else{
        cell.mediaType = "TEXT"
        hideFeedMediaViews(cell)
        cell.layoutIfNeeded()
    }
    
    }
     if(indexPath.row == (self.feedsJsonArray.count-2)){
                DispatchQueue.main.async{
                    self.getMoreData()
                }
     }
    cell.layoutIfNeeded()
    return cell
}

Answer 1

当您在 TableView 中显式插入或删除单元格或部分并且没有同时重新调整行或部分计数以匹配时，就会出现这种错误。在您的情况下，错误消息准确地告诉您计数不匹配是什么。您发布的代码未显示 TableView 中的任何插入或删除行，因此它必须在您的代码中的其他地方发生，也许在您的 getFeeds() 方法中？