[英]Cannot assign value of type '[String]' to type 'String?'
I can't call array in the tableView delegate method cellForRow at indexPath. 我无法在indexPath的tableView委托方法cellForRow中调用数组。 it gives an error message: 它给出一个错误信息:
Cannot assign value of type string to typeString? 无法将字符串类型的值分配给typeString?
import UIKit
struct cellData {
var open = Bool()
var currentRides = [String]()
var RequestedRides = [String]()
var sectionData = [String]()
}
class RideResultViewController: ContentViewController, UITableViewDelegate, UITableViewDataSource {
let currentRidesArray = ["1", "2", "3"]
let RequestedRidesArray = ["A", "B", "C"]
var tableViewData = [cellData]()
@IBAction func segmentedValueChanged(_ sender: Any) {
}
override func viewDidLoad() {
super.viewDidLoad()
//Expandable cell initailization
tableViewData = [cellData(open: false, currentRides: currentRidesArray, RequestedRides: RequestedRidesArray, sectionData: ["cell1", "cell2", "cell3"])]
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell") else {return UITableViewCell()}
if segmentedControl.selectedSegmentIndex == 0 {
cell.textLabel?.text = tableViewData[indexPath.section].currentRides
} else if segmentedControl.selectedSegmentIndex == 1 {
cell.textLabel?.text = RequestedRidesArray[indexPath.row]
}
return cell
} else {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell") else {return UITableViewCell()}
if segmentedControl.selectedSegmentIndex == 0 {
cell.textLabel?.text = tableViewData[indexPath.section].sectionData[indexPath.row]
} else if segmentedControl.selectedSegmentIndex == 1 {
cell.textLabel?.text = tableViewData[indexPath.section].sectionData[indexPath.row]
}
return cell
}
}
The code not building. 代码未构建。 I tied to put it in a square bracket but it still gave same error. 我绑在方括号中,但它仍然给出相同的错误。
Its because this is [String]
an array of String 其原因是因为这是[String]
String数组
Change this line to 将此行更改为
cell.textLabel?.text = tableViewData[indexPath.section].currentRides
This line 这条线
cell.textLabel?.text = tableViewData[indexPath.section].currentRides[indexPath.row]
The error is self explainary.. 错误是自我解释。
Cannot assign value of type '[String]' to type 'String?' 无法将类型“ [String]”的值分配给类型“ String?”
It means you are assigning an array of string ie [String] to string type which is not allowed. 这意味着您正在将字符串数组(即[String])分配给不允许的字符串类型。
When you are setting cell.textLabel?.text = ...
please make sure that you are assigning String type
not [String] type
. 设置cell.textLabel?.text = ...
请确保您分配的是String type
而不是[String] type
。
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