ios swift：Tableview“un”-checkmark cell

在cellForRowAtIndexPath方法中，我这样做，当我知道，有数据我可以勾选：

 if (self.selectedLessonObject != nil){ if(lessons["name"] as String == selectedLessonObject["name"] as String){ cell.accessoryType = .Checkmark } } 

在didSelectRowAtIndexPath我执行：

 // update the checkmark for the current row let cell = tableView.cellForRowAtIndexPath(indexPath) cell?.accessoryType = .Checkmark 

我还搞不清楚如何在select新的单元格之前取消select旧的单元格？

如何将选定的行保存在cellForRowAtIndexPath并在didSelectRowAtIndexPath访问它以取消select它？

谢谢！！

编辑：

当我尝试这个：

 var lastSelectedRow: NSIndexPath? = nil 

在cellForRowAtIndexPath

 if (self.selectedLessonObject != nil){ if(lessons.objectId == selectedLessonObject.objectId){ cell.accessoryType = .Checkmark lastSelectedRow = tableView.indexPathForSelectedRow() }else{ cell.accessoryType = .None } } println("selected: \(lastSelectedRow)") 

我得到一个零输出。

在didSelectRowAtIndexPath我想到了这个：

 // Other row is selected - need to deselect it // catch the previous selected row var oldcell = tableView.cellForRowAtIndexPath(lastSelectedRow!) oldcell?.accessoryType = .None 

但我无法捕捉从当前行从cellForRowAtIndexPath didSelectRowAtIndexPath

Answer 1

如果您在didSelectRowAtIndexPathselect新行，请检查新属性是否为空，如果是，则通过调用

 if let last = lastSelectedRow { let oldSelectedCell = tableView.cellForRowAtIndexPath(last) oldSelectedCell.accessoryType = .None } lastSelectedRow = indexPath let cell = tableView.cellForRowAtIndexPath(indexPath) cell.accessoryType = .Checkmark 

在cellForRowAtIndexPath检查新属性是否为空，等于indexPath，否则取消勾选：

 if let last = lastSelectedRow { if (self.selectedLessonObject != nil){ if(lessons.objectId == selectedLessonObject.objectId && last == indexPath){ cell.accessoryType = .Checkmark }else{ cell.accessoryType = .None } } else{ cell.accessoryType = .None } } else{ if (self.selectedLessonObject != nil){ if(lessons.objectId == selectedLessonObject.objectId){ cell.accessoryType = .Checkmark lastSelectedRow = indexPath }else{ cell.accessoryType = .None } } } 

Answer 2

您可以保存indexPath或所选单元格的行。 或者你可以试着从：

 tableview.indexPathForSelectedRow() 

Answer 3

 lastSelectedRow = indexPath let cell = tableView.cellForRowAtIndexPath(indexPath) cell!.accessoryType = .Checkmark if selected.count > 0{ if selected.containsObject(lastSelectedRow!.row){ if cell!.accessoryType == .Checkmark{ cell!.accessoryType = .None selected.removeObject(lastSelectedRow!.row) }else{ cell!.accessoryType = .Checkmark } }else{ selected.addObject(lastSelectedRow!.row) } }else{ selected.addObject(lastSelectedRow!.row) }