UITableView 选择 onLoad

Question

我有这个tableView：

而且效果很好，我正在使用它来过滤从 http 请求接收到的数据。我想在更改视图时保存选择并在返回时重置它。我试过（见注释的代码）但我没有错误。 有人可以帮助我或解释我该怎么做吗？

这是我的代码：

// MARK: TableView
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return names.count
}

// Customize header
override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView {
    let view: UIView = UIView(frame: CGRectMake(0, 0, tableView.frame.size.width, 18))
    let label: UILabel = UILabel(frame: CGRectMake(10, 5, tableView.frame.size.width, 18))
    label.font = UIFont.boldSystemFontOfSize(18)
    let string: String = names[section]
    label.text = string
    label.textColor = .redColor()
    label.textAlignment = NSTextAlignment.Left
    view.addSubview(label)
    view.backgroundColor = ColorHex().UIColorFromHex(0xEEEEEE)
    return view
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    var number: Int!

    switch section {
    case 0:
        number = 1 //reset filter
        break
    case 1:
        number = statusesDict.count
        break
    case 2:
        number = queuesDict.count
        break
    case 3:
        number = typesDict.count
        break
    case 4:
        number = severitiesDict.count
    default:
        break
    }

    return number
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{

    let cell: TicketsFilterCell! = tableView.dequeueReusableCellWithIdentifier("cellTicketFilter", forIndexPath: indexPath) as! TicketsFilterCell

    cell.delegate = self

    if self.selectedIndexPathArray.contains(indexPath) {
        cell.switchFilter.setOn(true, animated: false)
    } else {
        cell.switchFilter.setOn(false, animated: false)
    }


    if(indexPath.section == 0) {

        let text = "Resetta tutti i filtri"

        cell.textFilter.text = text

    } else if(indexPath.section == 1) {

        let text = statusesDict[indexPath.row]?.capitalizedString

        cell.textFilter.text = text

    } else if(indexPath.section == 2) {

        let text = queuesDict[indexPath.row]?.capitalizedString

        cell.textFilter.text = text

    } else if(indexPath.section == 3) {

        let text = typesDict[indexPath.row]?.capitalizedString

        cell.textFilter.text = text

    } else if (indexPath.section == 4) {

        let text = severitiesDict[indexPath.row]?.capitalizedString

        cell.textFilter.text = text

    }


    return cell

}

//change value to true for edit tableView rows
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool
{
    return false
}


//show selection
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{

    if let index = self.selectedIndexPathArray.indexOf(indexPath) {
        self.selectedIndexPathArray.removeAtIndex(index)
    } else {
        self.selectedIndexPathArray.append(indexPath)
    }

    let cell = self.tableview.cellForRowAtIndexPath(indexPath) as! TicketsFilterCell
    cell.toggleSwitch()


}

func switchButtonTapped(WithStatus status: Bool, ForCell cell: TicketsFilterCell) {
    let indexPath = self.tableview .indexPathForCell(cell)

    if (status == true) {

        if self.selectedIndexPathArray.indexOf(indexPath!) == nil {
            self.selectedIndexPathArray.append(indexPath!)
        }


        //update dictSelected
        switch (self.tableview.indexPathForCell(cell)!.section) {
        case 0:
            print("section 0, reset all filter")
            self.dictSelectedReset.updateValue(true, forKey: String((indexPath?.row)! + 1))
            break
        case 1:
            //take data from status
            print("section 1, value -> \(statusesDict[(indexPath?.row)!]) for row \(String(indexPath!.row))")
            self.dictSelectedStatus.updateValue(statusesDict[(indexPath?.row)!]!, forKey: String((indexPath?.row)! + 1))
            break
        case 2:
            //take data from queue
            print("section 2, value -> \(queuesDict[(indexPath?.row)!]) for row \(String(indexPath!.row))")
            self.dictSelectedQueue.updateValue(queuesDict[(indexPath?.row)!]!, forKey: String((indexPath?.row)! + 1))
            break
        case 3:
            //take data from type
            print("section 3, value -> \(typesDict[(indexPath?.row)!]) for row \(String(indexPath!.row))")
            self.dictSelectedType.updateValue(typesDict[(indexPath?.row)!]!, forKey: String((indexPath?.row)! + 1))
            break
        case 4:
            //take data from severity
            print("section 4, value in -> \(severitiesDict[(indexPath?.row)!]) for row \(String(indexPath!.row))")
            self.dictSelectedSeverity.updateValue(severitiesDict[(indexPath?.row)!]!, forKey: String((indexPath?.row)! + 1))
            break
        default:
            break
        }

    }
    else {

        if let index = self.selectedIndexPathArray.indexOf(indexPath!) {
            self.selectedIndexPathArray.removeAtIndex(index)
        }


        //update dictSelected
        //if exist, delete re-tapped

        switch (self.tableview.indexPathForCell(cell)!.section) {
        case 0:
            if (dictSelectedReset.keys.contains(String((indexPath?.row)! + 1))) {
                dictSelectedReset.removeValueForKey(String((indexPath?.row)! + 1))
            }
            break
        case 1:
            if (dictSelectedStatus.keys.contains(String((indexPath?.row)! + 1))) {
                dictSelectedStatus.removeValueForKey(String((indexPath?.row)! + 1))
            }
            break
        case 2:
            if (dictSelectedQueue.keys.contains(String((indexPath?.row)! + 1))) {
                dictSelectedQueue.removeValueForKey(String((indexPath?.row)! + 1))
            }
            break
        case 3:
            if (dictSelectedType.keys.contains(String((indexPath?.row)! + 1))) {
                dictSelectedType.removeValueForKey(String((indexPath?.row)! + 1))
            }
            break
        case 4:
            if (dictSelectedSeverity.keys.contains(String((indexPath?.row)! + 1))) {
                dictSelectedSeverity.removeValueForKey(String((indexPath?.row)! + 1))
            }
            break
        default:
            break
        }
    }

这是单元格的代码：

protocol CellProtocol : class {
func switchButtonTapped(WithStatus status : Bool, ForCell cell : TicketsFilterCell)
}
class TicketsFilterCell: UITableViewCell {

@IBOutlet var textFilter: UILabel!
@IBOutlet weak var switchFilter: UISwitch!

weak var delegate : CellProtocol!

class var reuseIdentifier: String? {
    get {
        return "TicketsFilterCell"
    }
}

override func awakeFromNib() {
    super.awakeFromNib()
}


//  Uncomment here to show switches that are preselected on load

//    override func setSelected(selected: Bool, animated: Bool) {
//        super.setSelected(selected, animated: animated)
//        self.delegate .switchButtonTapped(WithStatus: selected, ForCell: self)
//    }



@IBAction func switchTapped(sender: UISwitch) {

    self.delegate.switchButtonTapped(WithStatus: sender.on, ForCell: self)

}

// select UISwitch and change status
func toggleSwitch() {
    if self.switchFilter.on {
        self.switchFilter .setOn(false, animated: true)
    } else {
        self.switchFilter .setOn(true, animated: true)
    }
    self.delegate.switchButtonTapped(WithStatus: self.switchFilter.on, ForCell: self)
}

}

我真的不知道怎么做才对..

提前致谢。

Answer 1

你的方法应该是这样的。

1. 取一个数组 [say boolArr] 等于您在
中使用的 number 变量的计数

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int)

这个数组 [boolArr] 应该包含你的布尔按钮的状态，即。是打开还是关闭。

1. 在调用 viewwilldisappear 时保存此 [boolArr]。

2. 从视图中加载同一个数组[boolArr]中的数据会出现并在cellForRowAtIndexPath中进一步使用。

3. 在cellForRowAtIndexPath中加载数据时添加必要的nil和empty检查。