Question

所以我创建了一个具有两个TableView和一个Segment Control的View Controller。下面的代码给了我两个错误。

（return serviceImage.count）给出了一个错误，说明返回后的代码永远不会被执行。

2.（cell.myReviewPic！.image = UIImage（named：reviewPhoto [indexPath.row]））在解包可选值时返回意外发现的错误

我的代码

@IBAction func segmentedControlChanged(_ sender: Any) {
    myTableServiceU.reloadData()
    myTableService.reloadData()
}


@IBOutlet weak var segmentControl: UISegmentedControl!
@IBOutlet weak var myTableServiceU: UITableView!
@IBOutlet weak var myTableService: UITableView!

let serviceName: [String] = ["Whataburger", "Red Lobster", "Pizzahut", "McDonalds", "Burger King", "Sushi Garden", "In & Out Burger", "Canes", "Jimmy Johns"]

let serviceImage: [String] = ["place1,", "place2", "plac3", "place4", "place5", "place6", "place7", "place8", "place9"]

let serviceNumber: [String] = ["38", "35", "29", "25", "23", "19", "17", "12", "11"]

let brandPhoto: [String] = ["TK", "MC", "BA"]


override func viewDidLoad() {
    super.viewDidLoad()

    myTableService.dataSource = self
    myTableService.delegate = self

}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    switch(segmentControl.selectedSegmentIndex)
    {
    case 0:
        return  brandPhoto.count
    case 1:
        return  serviceName.count
        return  serviceImage.count
        return  serviceNumber.count
        break
    default:
        break
    }

    return 0
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! ServiceCell


    switch(segmentControl.selectedSegmentIndex)
    {
    case 0:
        cell.myReviewPic.image = UIImage(named: brandPhoto[indexPath.row])
        break

    case 1:
        cell.myServiceName.text = serviceName[indexPath.row]
        cell.myServiceImage.image = UIImage(named: serviceImage[indexPath.row])
        cell.myServiceNumber.text = serviceNumber[indexPath.row]
        break

    default:
        break
    }

    return cell
}

}

Answer 1

return  serviceName.count
return  serviceImage.count // Line will be ignored
return  serviceNumber.count // Line will be ignored

返回后的
[...]代码永远不会被执行。

这只是一个警告，因为只有serviceName数组才会返回它的数量。

cell.myReviewPic!.image = UIImage(named: reviewPhoto[indexPath.row]))

在展开可选值时意外发现nil

myReviewPic为零，您正尝试使用!强制解包它。可能无法通过IBOutlet连接到ServiceCell nib / xib。

我的代码中的自定义TableView +段控制器的格式和错误

1 个答案: