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UITableView在滚动时会丢失与所选单元格关联的属性。如何保存这些属性?-斯威夫特

uitableview swift ios

jamesMcKey · 技术社区 · 6 年前

我有一个带有自定义弹出窗口的应用程序,其中包含一个表视图(见下文)。当我点击复选框(ui按钮)时,我交换背景图像,并在选中和未选中之间切换。当我有一个复选框时,当我向上或向下滚动时,复选框默认回到unchecked。有人能告诉我如何在滚动时保持每个单元格的选中状态吗?

 class CustomHashTagPopup: UIViewController, UITableViewDelegate, UITableViewDataSource{


// CREATE TABLEVIEW CELLS
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = self.tableViewPicker.dequeueReusableCell(withIdentifier: "pickerCell") as! PreviewTableViewCustomPickerCell

    if(indexPath == [0,0]){
        let image = UIImage.init(named: "add")
        cell.checkBoxOutlet.setBackgroundImage(image!, for: .normal)
        cell.pickerLabel.text = "Create New HashTag"
        cell.isCreateTagCell = true

    }else{
        let image = UIImage.init(named: "uncheck")
        cell.checkBoxOutlet.setBackgroundImage(image!, for: .normal)
        cell.pickerLabel.text = arrayHashTags[indexPath.row]
        cell.isCreateTagCell = false
    }
    return cell

}


 }


 class PreviewTableViewCustomPickerCell: UITableViewCell {

 var isSelect: Bool = false
var isCreateTagCell: Bool = false // TO DISTINGUISH 'CEATE NEW HASHTAG OPTION'



/*** OUTLETS ***/

@IBOutlet weak var checkBoxOutlet: UIButton!
@IBOutlet weak var pickerLabel: UILabel!


 // TAP ON CHECK BOX
@IBAction func checkBoxBtn(_ sender: Any) {


    if(isSelect == false && isCreateTagCell == false){
        isSelect = true
        // SHOW GREEN SELECTED CHECK BOX
        let image = UIImage.init(named: "tick")
        self.checkBoxOutlet.setBackgroundImage(image!, for: .normal)

    }else if(isSelect == true && isCreateTagCell == false){
        isSelect = false
        // SHOW UNCHECKED BOX
        let image = UIImage.init(named: "uncheck")
        self.checkBoxOutlet.setBackgroundImage(image!, for: .normal)
    }
}

1 回复 | 直到 6 年前

Shehata Gamal 6 年前

cellForRowAt ,您可以为里面的按钮将操作委托给vc

let arr = [false,true,false,false,false] first index is dummy as it will be skipped in Create New HashTag

@objc func btnClicked(_ sender:UIButton) {
   arr[sender.tag] = !arr[sender.tag]
    // reload indexPath of row = sender.tag , section = 0
}

内部 cellForRowAt公司

if (indexPath == [0,0]) {
    let image = UIImage(named: "add")
    cell.checkBoxOutlet.setBackgroundImage(image!, for: .normal)
    cell.pickerLabel.text = "Create New HashTag"
    cell.isCreateTagCell = true

}else{
    let image = UIImage(named: arr[indexPath.row] ? "tick" : "uncheck") // edited here 
    cell.checkBoxOutlet.setBackgroundImage(image!, for: .normal)
    cell.pickerLabel.text = arrayHashTags[indexPath.row]
    cell.isCreateTagCell = false
}

cell.button.addTarget(self, action: #selector(btnClicked(_:)), for: .touchUpInside)
cell.button.tag = indexPath.row