Question

***更新：耶！它现在有效！***我一直在寻找几个小时，但还没有找到我想要解决的问题。有一些答案在那里使用目标c，但我正在尝试Swift，我似乎无法得到翻译的代码。（打赌你不能说我对此有多新！）我有一个简单的tableView，它显示了一个数组中的传输类型列表。按下每个单元格时，会弹出一个警告，询问用户之前是否使用过这种类型的运输。他们可以回答是或否。如果答案是肯定的，那么我想取消隐藏tableView中的一个标签。好像应该这么简单，但我正在撕扯我的头发。 tableview工作完美，警报工作完美;我似乎无法取消隐藏tableView中的标签。我想我需要在某个地方重新加载tableView，但我一直都会收到错误，说我不建议这样做。

这些是我的自定义单元格类中的出口：

class TransportCell: UITableViewCell {

@IBOutlet weak var transportationTitleLabel: UILabel!
@IBOutlet weak var typeLabel: UILabel!
@IBOutlet weak var transportationImage: UIImageView!
}

这是我的tableviewcontroller：

class TransportationTableViewController: UITableViewController {

struct TransportItem
{
    var label: String
    var subTitle: String
    var isHidden: Bool
}

let TransportationItems = [TransportItem(label: "Bus", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Helicopter", subTitle: "I have used this type before.", isHidden: false),
    TransportItem(label: "Truck", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Boat", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Bicycle", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Motorcycle", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Plane", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Train", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Car", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Scooter", subTitle: "I have used this type before.", isHidden: true),
    TransportItem(label: "Caravan", subTitle: "I have used this type before.", isHidden: true)]



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

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {

    return 1
}

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

    return TransportationItems.count
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell:TransportCell = tableView.dequeueReusableCellWithIdentifier("transportCell", forIndexPath: indexPath) as TransportCell

    var item = TransportationItems[indexPath.row]

    cell.transportationTitleLabel.text = item.label
    cell.typeLabel.text = item.subTitle
    cell.typeLabel.hidden = item.isHidden

    var imageName = UIImage(named:item.label)
    cell.transportationImage.image = imageName

    return cell
}

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
    var item = self.TransportationItems[indexPath.row]

    let alert = UIAlertController(title: "Used this transport?", message: "You selected \(item.label)", preferredStyle: UIAlertControllerStyle.Alert)

    alert.addAction(UIAlertAction(title: "No", style: UIAlertActionStyle.Cancel, handler: nil))
    alert.addAction(UIAlertAction(title: "Yes", style: UIAlertActionStyle.Default, handler: { alertAction in

        println(item.label)
        println(item.subTitle)

        var customCell = self.tableView.cellForRowAtIndexPath(indexPath) as TransportCell
        customCell.typeLabel.hidden = false


    }))
    self.presentViewController(alert, animated: true, completion: nil)
}

Answer 1

修改您的数据源（transportationItems）以执行struct而不是String：

struct TransportItem {
    var label: String
    var hidden: Bool
}

let transportationItems = [
                           TransportItem(label: "Bus", hidden: true),
                           ........
                           TransportItem(label: "Caravan", hidden: true)
                           ]

然后转到cellForRowAtIndexPath，然后执行：

var item = transportationItems[indexPath.row]
cell.typeLabel?.text = item.label
cell.typeLabel?.hidden = item.hidden

最后：

// THIS IS WHERE YOU LOST
// REMOVE THE CODE YOU HAVE, AND DO THIS
var item = self.transportationItems[indexPath.row]
item.hidden = false
self.tableView.reloadData()

如何将boolean从警报视图传递到swift中的自定义uitableviewcell

1 个答案: