ios – ‘*** – [__ NSArrayM insertObject：atIndex：]：执行UITableView动画重新加载时,对象不能为nil

概述问题摘要：当UITableViewCell的UITableViewCell的高度从UITextView编辑它的文本时,当UITableView中有很多单元格时,它会崩溃.使用iOS 8自定义单元格. 长问题：我已经成功实现,所以我可以动态地使用iOS 8自定义单元格进入单元格UITextView的文本,并改变单元格高度而不失去焦点(firstReponder).但是,如果tableView太大(行 问题摘要：当UItableVIEwCell的UItableVIEwCell的高度从UITextVIEw编辑它的文本时,当UItableVIEw中有很多单元格时,它会崩溃.使用iOS 8自定义单元格.

长问题：我已经成功实现,所以我可以动态地使用iOS 8自定义单元格进入单元格UITextVIEw的文本,并改变单元格高度而不失去焦点(firstReponder).但是,如果tableVIEw太大(行数太多),则会崩溃.这是我的堆栈跟踪：

Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'*** First throw call stack:(0   CoreFoundation                      0x000000010b3b3d85 __exceptionPreprocess + 1651   libobjc.A.dylib                     0x000000010b9cbdeb objc_exception_throw + 482   CoreFoundation                      0x000000010b274cc5 -[__NSArrayM insertObject:atIndex:] + 9013   UIKit                               0x0000000108b05439 __46-[UItableVIEw _updateWithItems:updateSupport:]_block_invoke1029 + 1804   UIKit                               0x0000000108a7e838 +[UIVIEw(UIVIEwAnimationWithBlocks) _setupAnimationWithDuration:delay:vIEw:options:factory:animations:start:animationStateGenerator:completion:] + 5825   UIKit                               0x0000000108a7ec6d +[UIVIEw(UIVIEwAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 1056   UIKit                               0x0000000108b05048 -[UItableVIEw _updateWithItems:updateSupport:] + 45907   UIKit                               0x0000000108afd5a0 -[UItableVIEw _endCellAnimationsWithContext:] + 153608   Test RYM                            0x0000000107e6a173 _TFE8Test_RYMCSo11UItableVIEw31reloadDataAnimatedKeePingOffsetfT_T_ + 1639   Test RYM                            0x0000000107e6a242 _TToFE8Test_RYMCSo11UItableVIEw31reloadDataAnimatedKeePingOffsetfT_T_ + 3410  Test RYM                            0x0000000107dcda90 _TFC8Test_RYM20AgendaVIEwController19cellHeightDIDUpdatefTCSo11NSIndexPath6heightV12CoreGraphics7CGfloat_T_ + 14411  Test RYM                            0x0000000107dcdb04 _TToFC8Test_RYM20AgendaVIEwController19cellHeightDIDUpdatefTCSo11NSIndexPath6heightV12CoreGraphics7CGfloat_T_ + 6812  Test RYM                            0x0000000107e725cb _TFC8Test_RYM27AgendaDecisiontableVIEwCell20updateTextVIEwHeightfT_T_ + 90713  Test RYM                            0x0000000107e731fa _TFC8Test_RYM27AgendaDecisiontableVIEwCell17textVIEwDIDChangefCSo10UITextVIEwT_ + 42

并导致它的代码：

// In UItableVIEw extensionfunc reloadDataAnimatedKeePingOffset() {    //let offset = contentOffset    //UIVIEw.setAnimationsEnabled(false)    beginUpdates()    endUpdates()    //UIVIEw.setAnimationsEnabled(true)    //layoutIfNeeded()    //contentOffset = offset}// In a self-sizing UItableVIEwCell subclassfunc updateTextVIEwHeight() {    let size = decisionTextVIEw.bounds.size    let newSize = decisionTextVIEw.sizeThatFits(CGSize(wIDth: size.wIDth,height: CGfloat.max))    let newHeight = newSize.height    if size.height != newHeight {        textVIEwHeightConstraint.constant = newHeight        agendaVIEwController?.cellHeightDIDUpdate(indexPath!,height: newSize.height)    }}// In the VIEwController managing the tableVIEwpublic func cellHeightDIDUpdate(indexPath: NSIndexPath,height: CGfloat) {    updateHelperAlphas()    tableVIEw?.reloadDataAnimatedKeePingOffset()}

它在调用endUpdates()时崩溃.我已经尝试删除tableVIEw：estimateHeightForRowAtIndexPath：方法在UITableView insertRowsAtIndexPaths throwing __NSArrayM insertObject:atIndex:’object cannot be nil’ error中没有成功.

它似乎只发生在列表很长时间.

编辑：我使用的更多方法：

public func tableVIEw(tableVIEw: UItableVIEw,estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGfloat {    return 48.0}public func tableVIEw(tableVIEw: UItableVIEw,heightForheaderInSection section: Int) -> CGfloat {    if (section == 0) {        return 0    }    else {        let currentSectionIsEmpty = sectionIsEmpty(section)        if ((!isInEditProtocolMode && isProtocolMode) || isPrevIoUsProtocolMode) && currentSectionIsEmpty {            return 0        }        let subSection = sectionHelper.subSectionForSection(section)        let isProtocoltopSection = isProtocolMode && subSection == 0        if (isProtocoltopSection) {            return UItableVIEwautomaticDimension        }        else {            return agendaheaderHeight        }    }}public func tableVIEw(tableVIEw: UItableVIEw,estimatedHeightForheaderInSection section: Int) -> CGfloat {    if (section == 0) {        return 0    }    else {        let subSection = sectionHelper.subSectionForSection(section)        let isProtocoltopSection = isProtocolMode && subSection == 0        if (isProtocoltopSection) {            return protocolAgendaheaderHeight        }        else {            return agendaheaderHeight        }    }}public overrIDe func vIEwDIDLoad() {    super.vIEwDIDLoad()    tableVIEw.rowHeight = UItableVIEwautomaticDimension}

EDIT2：
这几乎是同样的问题. tableView crashes on end up with more than 16 items然而,我无法消除细胞高度的估计,因为这破坏了我的自动调整细胞图的动态高度.

编辑3：
尝试(从下面的评论)使用CATransaction.setdisableActions(_)和setContentOffset(_：动画:)没有任何帮助.这似乎与此无关,除了beginUpdates()和endUpdates()都没有帮助. reloadDataAnimatedKeePingOffset()似乎只被调用一次,没有其他reloadData似乎被调用在同一时间.将估计高度设置为1而不是0也没有帮助.它奇怪地显示零标题而不是高度1.

编辑4：
根据请求,我的numberOrRowsInSection和cellForRowAtIndexPath方法(有点复杂)：

public func tableVIEw(tableVIEw: UItableVIEw,numberOfRowsInSection section: Int) -> Int{    let mainSection = sectionHelper.mainSectionForSection(section)    let subSection = sectionHelper.subSectionForSection(section)    let isheaderSection = subSection <= 0    if isheaderSection {        return isProtocolMode ? 0 : cellIDSectionList[0].count    }    let rowType = sectionHelper.rowTypeForSection(section)    let agenda = agendaForSection(section)    switch rowType {    case .NoteRow:        return mainSectionShowingPlaceholderNewNoteCell == mainSection || !agenda.protocolString.isEmpty ? 1 : 0    case .ActionRow:        let count = max(0,agenda.actionListCount())        return count    case .DecisionRow:        var count = agenda.decisions.count ?? 0        count = max(0,count)        count = indexPathShowingPlaceholderNewDecisionCell?.section == section ? count+1 : count        return count    default:        return 0    }}public func tableVIEw(tableVIEw: UItableVIEw,cellForRowAtIndexPath indexPath: NSIndexPath) -> UItableVIEwCell{    let row = indexPath.row    let section = indexPath.section    let cellID = cellIDForIndexPath(indexPath)    let cell = tableVIEw.dequeueReusableCellWithIDentifIEr(cellID,forIndexPath: indexPath)    let allowEditing = (isInEditProtocolMode || !isProtocolMode) && !isPrevIoUsProtocolMode    if let TitleCell = cell as? StandardTitletableVIEwCell {        TitleCell.setup(agendaForSection(section),meeting:selectedMeeting!,indexPath:indexPath)        TitleCell.delegate = self    }    if let descriptionCell = cell as? StandardDescriptiontableVIEwCell {        descriptionCell.setup(agendaForSection(section),indexPath: indexPath,forceExpand: hasExpandedDescriptionCellVIEw)        descriptionCell.delegate = self    }    if let noteCell = cell as? AgendaNotestableVIEwCell {        noteCell.setup(agendaForSection(section),allowEditing:allowEditing)        noteCell.agendaVIEwController = self    }    if let decisionCell = cell as? AgendaDecisiontableVIEwCell {        let decisionList = agendaForSection(section).decisions        let isNewDecisionCell = row >= decisionList.count        if !isNewDecisionCell {            let decision = decisionList[row]            decisionCell.setup(decision,allowEditing: allowEditing)        }        else {            decisionCell.setup(newDecisionToAdd!,allowEditing: allowEditing)        }        decisionCell.agendaVIEwController = self    }    if let actionCell = cell as? StandardtableVIEwCell,let actionList = agendaForSection(section).actionList {            let action = actionList.actions[row]            actionCell.setupAsActionListCell(action:action,delegate: self)    }    if let textCell = cell as? MeetingTexttableVIEwCell {        var placeholderText = ""        if indexPathIsActionTextPlaceholderCell(indexPath) {            placeholderText = __("agenda.noActions.text")        }        else if indexPathIsDecisionTextPlaceholderCell(indexPath) {            placeholderText = __("agenda.noDecisions.text")        }        textCell.setup(placeholderText)    }    return cell}public func tableVIEw(tableVIEw: UItableVIEw,vIEwForheaderInSection section: Int) -> UIVIEw?{    if (section == 0) {        return nil    }    let subSection = sectionHelper.subSectionForSection(section)    let cellID = isProtocolMode && subSection == 0 ? protocolheaderCellID : headerCellID    let cell = tableVIEw.dequeueReusableheaderfooterVIEwWithIDentifIEr(cellID)    let agenda = agendaForSection(section)    if let standardheaderCell = cell as? StandardtableVIEwheaderCell {        let subSection = sectionHelper.subSectionForSection(section)        let currentSectionIsEmpty = sectionIsEmpty(section)        let protocolisLocked = selectedMeeting!.protocolisLocked        if (isPrevIoUsProtocolMode && currentSectionIsEmpty) {            return nil        }        let allowEditing = (isInEditProtocolMode || !isProtocolMode) && !isPrevIoUsProtocolMode && !protocolisLocked        let showRightAddbutton = ((subSection == 1 && currentSectionIsEmpty) || subSection == 2 || (subSection == 3 && indexPathShowingPlaceholderNewDecisionCell?.section != section)) && allowEditing        let headerTitle = headerTitleList[subSection]        standardheaderCell.setupWithText(headerTitle,section:section,showAddbutton: showRightAddbutton,delegate: self)    }    else if let protocolheaderCell = cell as? ProtocoltableVIEwheaderCell {        let showSeparator = section > 1        let onlyShowAttachmentIfItHaveAttachments = isPrevIoUsProtocolMode || (isProtocolMode && !isInEditProtocolMode)        let showAttachmentIcon = !onlyShowAttachmentIfItHaveAttachments || agenda.attachments.count > 0        protocolheaderCell.setup(showSeparator: showSeparator,agenda: agenda,section: section,showProtocolicon: false,showAttachmentIcon: showAttachmentIcon,delegate: self)    }    return cell!.wrappedInNewVIEw()}// In UIVIEw extensionfunc wrappedInNewVIEw() -> UIVIEw{    let vIEw = UIVIEw(frame: frame)    autoresizingMask = [.FlexibleHeight,.FlexibleWIDth]    vIEw.addSubvIEw(self)    return vIEw}

解决方法 这是关于这个iOS BUG的雷达： http://openradar.appspot.com/15729686
所有我建议你要做的是取代这个：

public func tableVIEw(tableVIEw: UItableVIEw,estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGfloat {    return 48.0}

有了这个：

tableVIEw.rowHeight = UItableVIEwautomaticDimensiontableVIEw.estimatedRowHeight = 48.0

如果还是崩溃了,那么也尝试去除tableVIEw：estimatedHeightForheaderInSection：方法

我们应该穿过我们的手指,希望这个雷达将关闭与新的iOS X 总结

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