Swift投射错误，应该没有

Question

我试图显示两个xib文件中的一个，具体取决于驱动UITable Population的数组内部的内容，但是我在以下函数中遇到了一个转换错误：

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if(phoneNo[indexPath.row] == "dropdowncell") {
            //this means that the cell populated should be a dropdown cell
            let nib2 = UINib(nibName: "DropDownOptionsCell", bundle: nil)
            print("dropdown if statement hit son")

            self.myTableView.register(nib2, forCellReuseIdentifier: "cell")
            let cell2 = myTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! DropDownOptionsCell

            //cell2.dropDown.tag = indexPath.row
            //cell2.dropDown.addTarget(self, action: #selector(self.test(sender:)), for:UIControlEvents.touchUpInside)

            return cell2
        }
        else {
            //this means the cell populated should be a contact cell
            let nib = UINib(nibName: "ContactCell", bundle: nil)

            self.myTableView.register(nib, forCellReuseIdentifier: "cell")
            let cell = myTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ContactCell

            print("/n/n below is the cell")
            print(cell)

            //below gets the index
            var val = indexPath.row

            print("beliw is the name")
            print(name)

            print("/n/n below is the val")
            print(val)

            cell.dropDown.tag = indexPath.row
            cell.dropDown.addTarget(self, action: #selector(self.test(sender:)), for:UIControlEvents.touchUpInside)

            if(phoneNo.contains("dropdowncell")) {
                //this gets rid of uneven amount in the two arrays
                var testArray = [String]()
                testArray = phoneNo
                print(phoneNo)
                print("drop down index below")
                print(dropDownIndex)
                let testInd = testArray.remove(at: dropDownIndex)
                print("below is the testArray")
                print(testArray)
                val = testArray.count
            }

            //below assigns the values of the fields on the cell
            //cell.contactName.text = (name[val])

            return cell
        }

        return UITableViewCell()
    }

由于以下错误，此功能失败：

  

无法将'Phlare.ContactCell'（0x1056a1fe8）类型的值转换为'Phlare.DropDownOptionsCell'

以下代码行发生此错误：

let cell2 = myTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! DropDownOptionsCell

Answer 1

两个单元格不能具有相同的单元格标识符。在运行之前，请仔细匹配任一单元格上的标识符。

希望它有所帮助。

我刚刚通过替换正确的小区标识符来纠正您的代码。

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if(phoneNo[indexPath.row] == "dropdowncell") {
            //this means that the cell populated should be a dropdown cell
            let nib2 = UINib(nibName: "DropDownOptionsCell", bundle: nil)
            print("dropdown if statement hit son")

            self.myTableView.register(nib2, forCellReuseIdentifier: "cell")
            let cell2 = myTableView.dequeueReusableCell(withIdentifier: "DropDownOptionsCell", for: indexPath) as! DropDownOptionsCell

            //cell2.dropDown.tag = indexPath.row
            //cell2.dropDown.addTarget(self, action: #selector(self.test(sender:)), for:UIControlEvents.touchUpInside)

            return cell2
        }
        else {
            //this means the cell populated should be a contact cell
            let nib = UINib(nibName: "ContactCell", bundle: nil)

            self.myTableView.register(nib, forCellReuseIdentifier: "cell")
            let cell = myTableView.dequeueReusableCell(withIdentifier: "ContactCell", for: indexPath) as! ContactCell

            print("/n/n below is the cell")
            print(cell)

            //below gets the index
            var val = indexPath.row

            print("beliw is the name")
            print(name)

            print("/n/n below is the val")
            print(val)

            cell.dropDown.tag = indexPath.row
            cell.dropDown.addTarget(self, action: #selector(self.test(sender:)), for:UIControlEvents.touchUpInside)

            if(phoneNo.contains("dropdowncell")) {
                //this gets rid of uneven amount in the two arrays
                var testArray = [String]()
                testArray = phoneNo
                print(phoneNo)
                print("drop down index below")
                print(dropDownIndex)
                let testInd = testArray.remove(at: dropDownIndex)
                print("below is the testArray")
                print(testArray)
                val = testArray.count
            }

            //below assigns the values of the fields on the cell
            //cell.contactName.text = (name[val])

            return cell
        }

        return UITableViewCell()
    }