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 + 165 1 libobjc.A.dylib 0x000000010b9cbdeb objc_exception_throw + 48 2 CoreFoundation 0x000000010b274cc5 -[__NSArrayM insertObject:atIndex:] + 901 3 UIKit 0x0000000108b05439 __46-[UITableView _updateWithItems:updateSupport:]_block_invoke1029 + 180 4 UIKit 0x0000000108a7e838 +[UIView(UIViewAnimationWithBlocks) _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 582 5 UIKit 0x0000000108a7ec6d +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 105 6 UIKit 0x0000000108b05048 -[UITableView _updateWithItems:updateSupport:] + 4590 7 UIKit 0x0000000108afd5a0 -[UITableView _endCellAnimationsWithContext:] + 15360 8 Test RYM 0x0000000107e6a173 _TFE8Test_RYMCSo11UITableView31reloadDataAnimatedKeepingOffsetfT_T_ + 163 9 Test RYM 0x0000000107e6a242 _TToFE8Test_RYMCSo11UITableView31reloadDataAnimatedKeepingOffsetfT_T_ + 34 10 Test RYM 0x0000000107dcda90 _TFC8Test_RYM20AgendaViewController19cellHeightDidUpdatefTCSo11NSIndexPath6heightV12CoreGraphics7CGFloat_T_ + 144 11 Test RYM 0x0000000107dcdb04 _TToFC8Test_RYM20AgendaViewController19cellHeightDidUpdatefTCSo11NSIndexPath6heightV12CoreGraphics7CGFloat_T_ + 68 12 Test RYM 0x0000000107e725cb _TFC8Test_RYM27AgendaDecisionTableViewCell20updateTextViewHeightfT_T_ + 907 13 Test RYM 0x0000000107e731fa _TFC8Test_RYM27AgendaDecisionTableViewCell17textViewDidChangefCSo10UITextViewT_ + 42
并导致它的代码:
// In UITableView extension func reloadDataAnimatedKeepingOffset() { //let offset = contentOffset //UIView.setAnimationsEnabled(false) beginUpdates() endUpdates() //UIView.setAnimationsEnabled(true) //layoutIfNeeded() //contentOffset = offset } // In a self-sizing UITableViewCell subclass func 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 tableView public 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 extension func wrappedInNewView() -> UIView { let view = UIView(frame: frame) autoresizingMask = [.FlexibleHeight,.FlexibleWidth] view.addSubview(self) return view }
解决方法
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 = UITableViewAutomaticDimension tableView.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