ios - 预期返回 'UITableViewCell' 和两个 tableView 的函数中缺少返回值

Question

我用的是croll view，一个view里面有两个(或者很多)tableView像这样

但在功能上:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

这是一个错误

missing return in a function expected to return 'UITableViewCell'

但是我做到了

返回单元格

错误是怎么发生的？

class DetailViewController: UIViewController, UITableViewDataSource, UITableViewDelegate  {
@IBOutlet weak var scroll: UIScrollView!

@IBOutlet var recipesImageView: UIImageView!
@IBOutlet var tableView:UITableView!
@IBOutlet var tableView2: UITableView!

var recipes:Recipe!
var noodles:Recipe!
var snacks:Recipe!
var category: Int = Int()

@IBAction func segmented(sender: AnyObject) {
    switch sender.selectedSegmentIndex {
        case 0:
            scroll.setContentOffset(CGPoint(x:0, y:0), animated: true)
        case 1:
            scroll.setContentOffset(CGPoint(x:375, y:0), animated: true)
        case 2:
            scroll.setContentOffset(CGPoint(x:750, y:0), animated: true)
        case 3:
            scroll.setContentOffset(CGPoint(x:1125, y:0), animated: true)


        default:
            print()
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    switch self.category {
        case 0:
            self.recipesImageView.image = UIImage(named: recipes.image)
            title = self.recipes.name
        case 1:
            self.recipesImageView.image = UIImage(named: noodles.image)
            title = self.noodles.name
        case 2:
            self.recipesImageView.image = UIImage(named: snacks.image)
            title = self.snacks.name
        case 3:
            self.recipesImageView.image = UIImage(named: noodles.image)
            title = self.noodles.name
        case 4:
            self.recipesImageView.image = UIImage(named: noodles.image)
            title = self.noodles.name
        default:
            self.recipesImageView.image = UIImage(named: recipes.image)
            title = self.recipes.name
    }

    self.tableView.backgroundColor = UIColor(red: 240.0/255.0, green: 240.0/255.0, blue: 240.0/255.0, alpha: 0.5)

    //刪除多餘的隔線
    self.tableView.tableFooterView = UIView(frame: CGRectZero)

    self.tableView.separatorColor = UIColor(red: 240.0/255.0, green: 240.0/255.0, blue: 240.0/255.0, alpha: 1)

    //title = self.recipes.name

    tableView.estimatedRowHeight = 36.0;
    tableView.rowHeight = UITableViewAutomaticDimension;

    self.tableView.delegate = self
    self.tableView.dataSource = self

    self.tableView2.delegate = self
    self.tableView2.dataSource = self

}

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

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    var cellNum:Int?

    if tableView == self.tableView {
        cellNum = 4
    }
    else if tableView == self.tableView2 {
        cellNum = 1
    }

    return cellNum!
}



func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {


if(tableView == self.tableView) {
    let cell: DetailTableViewCell = tableView.dequeueReusableCellWithIdentifier("Cell") as! DetailTableViewCell
    //cell.backgroundColor = UIColor.clearColor()
    if self.category == 0 {
        switch indexPath.row {
        case 0:
            cell.fieldLabel.text = "名稱"
            cell.valueLabel.text = recipes.name
            cell.amountLabel.text = ""

        case 1:
            cell.fieldLabel.text = "類型"
            cell.valueLabel.text = recipes.type
            cell.amountLabel.text = ""

        case 2:
            cell.fieldLabel.text = "收藏"
            cell.valueLabel.text = (recipes.isFavor) ? "Yes" : "No"
            cell.amountLabel.text = ""

        case 3:
            cell.fieldLabel.text = "食材"
            cell.valueLabel.text = recipes.material
            cell.amountLabel.text = recipes.amount
        default:
            cell.fieldLabel.text = ""
            cell.valueLabel.text = ""
            cell.amountLabel.text = ""
        }
    }

    if self.category == 1 {
        switch indexPath.row {
        case 0:
            cell.fieldLabel.text = "名稱"
            cell.valueLabel.text = noodles.name
            cell.amountLabel.text = ""

        case 1:
            cell.fieldLabel.text = "類型"
            cell.valueLabel.text = noodles.type
            cell.amountLabel.text = ""

        case 2:
            cell.fieldLabel.text = "收藏"
            cell.valueLabel.text = (noodles.isFavor) ? "Yes" : "No"
            cell.amountLabel.text = ""

        case 3:
            cell.fieldLabel.text = "食材"
            cell.valueLabel.text = noodles.material
            cell.amountLabel.text = noodles.amount
        default:
            cell.fieldLabel.text = ""
            cell.valueLabel.text = ""
            cell.amountLabel.text = ""
        }
    }

    if self.category == 2 {
        switch indexPath.row {
        case 0:
            cell.fieldLabel.text = "名稱"
            cell.valueLabel.text = snacks.name
            cell.amountLabel.text = ""

        case 1:
            cell.fieldLabel.text = "類型"
            cell.valueLabel.text = snacks.type
            cell.amountLabel.text = ""

        case 2:
            cell.fieldLabel.text = "收藏"
            cell.valueLabel.text = (snacks.isFavor) ? "Yes" : "No"
            cell.amountLabel.text = ""

        case 3:
            cell.fieldLabel.text = "食材"
            cell.valueLabel.text = snacks.material
            cell.amountLabel.text = snacks.amount
        default:
            cell.fieldLabel.text = ""
            cell.valueLabel.text = ""
            cell.amountLabel.text = ""
        }
    }

    if self.category == 3 {
        switch indexPath.row {
        case 0:
            cell.fieldLabel.text = "名稱"
            cell.valueLabel.text = noodles.name
            cell.amountLabel.text = ""

        case 1:
            cell.fieldLabel.text = "類型"
            cell.valueLabel.text = noodles.type
            cell.amountLabel.text = ""

        case 2:
            cell.fieldLabel.text = "收藏"
            cell.valueLabel.text = (noodles.isFavor) ? "Yes" : "No"
            cell.amountLabel.text = ""

        case 3:
            cell.fieldLabel.text = "食材"
            cell.valueLabel.text = noodles.material
            cell.amountLabel.text = noodles.amount
        default:
            cell.fieldLabel.text = ""
            cell.valueLabel.text = ""
            cell.amountLabel.text = ""
        }
    }

    if self.category == 4 {
        switch indexPath.row {
        case 0:
            cell.fieldLabel.text = "名稱"
            cell.valueLabel.text = noodles.name
            cell.amountLabel.text = ""

        case 1:
            cell.fieldLabel.text = "類型"
            cell.valueLabel.text = noodles.type
            cell.amountLabel.text = ""

        case 2:
            cell.fieldLabel.text = "收藏"
            cell.valueLabel.text = (noodles.isFavor) ? "Yes" : "No"
            cell.amountLabel.text = ""

        case 3:
            cell.fieldLabel.text = "食材"
            cell.valueLabel.text = noodles.material
            cell.amountLabel.text = noodles.amount
        default:
            cell.fieldLabel.text = ""
            cell.valueLabel.text = ""
            cell.amountLabel.text = ""
        }
    }
    return cell
}
else if tableView == tableView2 {
    let cell: MaterialDetailTableViewCell = tableView.dequeueReusableCellWithIdentifier("Cell2") as! MaterialDetailTableViewCell
    //cell.backgroundColor = UIColor.clearColor()
    if self.category == 0 {
        switch indexPath.row {
        case 0:
            cell.materialLabel.text = recipes.material
        default:
            cell.materialLabel.text = ""
        }
    }
    if self.category == 1 {
        switch indexPath.row {
        case 0:
            cell.materialLabel.text = noodles.material
        default:
            cell.materialLabel.text = ""
        }
    }
    if self.category == 2 {
        switch indexPath.row {
        case 0:
            cell.materialLabel.text = snacks.material
        default:
            cell.materialLabel.text = ""
        }
    }
    if self.category == 3 {
        switch indexPath.row {
        case 0:
            cell.materialLabel.text = noodles.material
        default:
            cell.materialLabel.text = ""
        }
    }
    if self.category == 4 {
        switch indexPath.row {
        case 0:
            cell.materialLabel.text = noodles.material
        default:
            cell.materialLabel.text = ""
        }
    }
    return cell
}
       //-----------------------this line appear error
}


//避免被前面一頁的隱藏導覽列所影響
override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    self.navigationController?.hidesBarsOnSwipe = false
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}

/*
 // MARK: - Navigation

 // In a storyboard-based application, you will often want to do a little preparation before navigation
 override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
 // Get the new view controller using segue.destinationViewController.
 // Pass the selected object to the new view controller.
 }
 */

Answer 1

当 tableView != self.tableView 和 tableView != tableView2 时，您什么都不返回。这就是您看到此错误的原因。如果您确定无法达到此要求，请尝试删除您的 else if 条件