tableview单元格上的步进（swift）

Question

我将stepper的两个出口和动作放入tableview单元格，并使用协议委托将其连接到tableview。当我在第一行中点击步进器时，步进器值在第一行中正常显示，但它也出现在某个随机行中。怎么解决这个问题？

的UITableViewCell

protocol ReviewCellDelegate{
    func stepperButton(sender: ReviewTableViewCell)
}

class ReviewTableViewCell: UITableViewCell {
   @IBOutlet weak var countStepper: UIStepper!
   @IBOutlet weak var stepperLabel: UILabel!

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
}

override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
}

@IBAction func stepperButtonTapped(sender: UIStepper) {
    if delegate != nil {
        delegate?.stepperButton(self)
        stepperLabel.text = "x \(Int(countStepper.value))"

    }
}

视图控制器

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cellIdentifier = "reviewCell"
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! ReviewTableViewCell


    var imageView: UIImageView?
    let photoG = self.photos[indexPath.row]
    imageView = cell.contentView.viewWithTag(1) as? UIImageView
    //let layout = cell.goodiesImage
    let tag = indexPath.row // +1
    cell.tag = tag
    photoG.fetchImageWithSize(CGSize(width: 1000, height: 1000), completeBlock: { image, info in
        if cell.tag == tag {
            imageView?.image = image
            cell.goodiesImage.image = image
        }
    })

func stepperButton(sender: ReviewTableViewCell) {
    if let indexPath = tableView.indexPathForCell(sender){
        print(indexPath)
    }
}

Answer 1

正如@ A-Live所提到的，您的组件正在被重用，因此需要进行更新。

所以在你的视图控制器中：

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cellIdentifier = "reviewCell"
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! ReviewTableViewCell


    var imageView: UIImageView?
    let photoG = self.photos[indexPath.row]
    imageView = cell.contentView.viewWithTag(1) as? UIImageView
    //let layout = cell.goodiesImage
    let tag = indexPath.row // +1
    cell.tag = tag
    photoG.fetchImageWithSize(CGSize(width: 1000, height: 1000), completeBlock: { image, info in
    if cell.tag == tag {
        imageView?.image = image
        cell.goodiesImage.image = image
    }
})
    cell.countStepper.value = XXX[indexPath.row].value; //Here you update your view
    cell.stepperLabel.text = "x \(Int(cell.countStepper.value))" //And here

和

func stepperButton(sender: ReviewTableViewCell) {
    if let indexPath = tableView.indexPathForCell(sender){
        print(indexPath)
        XXX[sender.tag].value = sender.counterStepper.value //Here you save your updated value
}

Answer 2

加载单元格时重置步进器的值。您可以在单元格的prepareForReuse方法中重置单元格属性值。在ReviewTableViewCell类中添加以下方法。

 override func prepareForReuse() 
 {
   super.prepareForReuse()

   countStepper.value = 0.0 
 }

Answer 3

在uitableViewCell VC中：

1 - 添加这些字段

var cellDelegate: cellProtocol?
var index: IndexPath?

2 - 然后在委托中添加：

func onStepperClick(index: Int, sender: UIStepper)

3 - 当您将步进器拖动为动作时使用此操作：

@IBAction func cellStepper(_ sender: UIStepper) {
    cellDelegate?.onStepperClick(index: (index?.row)!, sender: sender)
    sender.maximumValue = 1  //for incrementing
    sender.minimumValue = -1 //for decrementing
    //this will make sense later
}

在ViewController中

1 - 将这些添加到具有cellAtRow变量的tableView函数中。

cell.cellDelegate = self
cell.index = indexPath 

2 - 使用它代替stepperButton函数

func onStepperClick(index: Int, sender: UIStepper) {
    print(index)

    if sender.value == 1.0{
        //positive side of stepper was pressed
    }else if sender.value == -1.0{
        //negative side of stepper was pressed
    }

    sender.value = 0  //resetting to zero so sender.value produce different values on plus and minus

}

希望这对你有用