使表格视图部分迅速扩展

Question

我正在关注this教程，以扩展和折叠我的表视图部分。由于这个演示是在swift 2.2中完成的，因此根据swift 3.0进行了所有更改。我在if条件下遇到了以下函数（currentSectionCells [row] [“isVisible”]），它给出了我的错误“Type'NSFastEnumerationIterator.Element'（又名'Any'没有下标成员'）”。

func getIndicesOfVisibleRows() {
    visibleRowsPerSection.removeAll()

    for currentSectionCells in cellDescriptors {
        var visibleRows = [Int]()

        for row in 0...((currentSectionCells as! [[String: AnyObject]]).count - 1) {
            if currentSectionCells[row]["isVisible"] as! Bool == true {
                visibleRows.append(row)
            }
        }

        visibleRowsPerSection.append(visibleRows)
    }
}

我尝试过类型转换如下

    func getIndicesOfVisibleRows() {
    visibleRowsPerSection.removeAll()

    for currentSectionCells in cellDescriptors {
        var visibleRows = [Int]()

        for row in 0...((((currentSectionCells) as? NSMutableArray)?.count)! - 1) {

            let temp = [currentSectionCells][row] as? NSMutableDictionary
            let temp2 = temp?["isVisible"] as! Bool

            if temp2  == true {
                visibleRows.append(row)
            }
        }

        visibleRowsPerSection.append(visibleRows)
    }
}

但是这让我在运行时遇到了崩溃“让temp2 = temp？[”isVisible“]为！Bool”Crash说“EXC_BAD_INSTRUCTION”并且temp显示为nil。

请帮帮我们TIA

表视图委托和数据源

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    if cellDescriptors != nil {
        return cellDescriptors.count
    }
    else {
        return 0
    }
}


func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return visibleRowsPerSection[section].count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let currentCellDescriptor = getCellDescriptorForIndexPath(indexPath: indexPath as NSIndexPath)
    let cell = tableView.dequeueReusableCell(withIdentifier: currentCellDescriptor["cellIdentifier"] as! String, for: indexPath) as! CustomCell

    if currentCellDescriptor["cellIdentifier"] as! String == "sectionCellIdentifier" {
        if let primaryTitle = currentCellDescriptor["secondaryTitle"]
        {
            cell.sectionTitleLabel.text = primaryTitle as? String
        }
    }
    else if currentCellDescriptor["cellIdentifier"] as! String == "shortAnswerCell" {
        cell.questionTitle.text = currentCellDescriptor["primaryTitle"] as? String
        cell.questionTextView.text = currentCellDescriptor["secondaryTitle"] as? String
        cell.answerTextView.text =  currentCellDescriptor["answerTitle"] as? String

    }

    return cell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let indexOfTappedRow = visibleRowsPerSection[indexPath.section][indexPath.row]

    let temp = cellDescriptors[indexPath.section] as? NSArray
            let temp2 = temp?[indexOfTappedRow ] as? NSDictionary
            let temp3 = temp2?["isExpandable"] as! Bool

    if temp3 == true {
        var shouldExpandAndShowSubRows = false
        if temp3 == false {
            // In this case the cell should expand.
            shouldExpandAndShowSubRows = true
        }

        temp2?.setValue(shouldExpandAndShowSubRows, forKey: "isExpanded")

        for i in (indexOfTappedRow + 1)...(indexOfTappedRow + (temp2?["additionalRows"] as! Int)) {
            (temp![i] as AnyObject).setValue(shouldExpandAndShowSubRows, forKey: "isVisible")
        }
    }
    getIndicesOfVisibleRows()
    tblExpandable.reloadSections(NSIndexSet(index: indexPath.section) as IndexSet, with: UITableViewRowAnimation.fade)
}

Answer 1

另一答案

Answer 2

另一答案