[英]Stepper on tableview cell (swift)
我将步进器的插座和动作放入 tableview 单元格中,并使用协议委托将其连接到 tableview。 当我在第一行点击步进器时,步进器值在第一行正常出现,但它也出现在一些随机行中。 如何解决这个问题?
表视图单元格
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)
}
}
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。 在您的ReviewTableViewCell
类中添加以下方法。
override func prepareForReuse()
{
super.prepareForReuse()
countStepper.value = 0.0
}
正如@A-Live 所提到的,您的组件正在被重用,因此需要更新。
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
}
在 tableViewCell 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 - 当您将步进器作为动作拖过时,请使用以下命令:
@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
}
在视图控制器中
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 功能
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
注意:1.MY Cell 类是正常的..所有更改都在 viewcontroller 类中 2.我已经采用 stepper 并在它上面添加了 ibAddButton,其约束与 ibStepper 相同
class cell: UITableViewCell {
@IBOutlet weak var ibAddButton: UIButton!
@IBOutlet weak var ibStepper: UIStepper!
@IBOutlet weak var ibCount: UILabel!
@IBOutlet weak var ibLbl: UILabel!
}
1.定义空int数组[Int]()
var countArray = [Int]()
2. 将 countArray 与您想要在 tableview 中填充的数据数量一起添加为零
for arr in self.responseArray{
self.countArray.append(0)
}
3.在单元格中的行
func tableView(_ tableView: UITableView, cellForRowAt indexPath:
IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! cell
let dict = responseArray[indexPath.row] as? NSDictionary ?? NSDictionary()
cell.ibLbl.text = dict["name"] as? String ?? String()
if countArray[indexPath.row] == 0{
cell.ibAddButton.tag = indexPath.row
cell.ibStepper.isHidden = true
cell.ibAddButton.isHidden = false
cell.ibCount.isHidden = true
cell.ibAddButton.addTarget(self, action: #selector(addPressed(sender:)), for: .touchUpInside)
}else{
cell.ibAddButton.isHidden = true
cell.ibStepper.isHidden = false
cell.ibStepper.tag = indexPath.row
cell.ibCount.isHidden = false
cell.ibCount.text = "\(countArray[indexPath.row])"
cell.ibStepper.addTarget(self, action: #selector(stepperValueChanged(sender:)), for: .valueChanged)}
return cell
}
4.objc函数
@objc func stepperValueChanged(sender : UIStepper){
if sender.stepValue != 0{
countArray[sender.tag] = Int(sender.value)
}
ibTableView.reloadData()
}
@objc func addPressed(sender : UIButton){
countArray[sender.tag] = 1//countArray[sender.tag] + 1
ibTableView.reloadData()
}
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