Question

我有一个带有自定义单元格resultsCell的UITableView。它包含4个UILabel和6个UIButton，看起来像这样（我标记了每个框的类型）：

UITableView中大约有10个这些单元格，因此当然可以重复使用这些单元格。每当我上下滚动多次时，单元格中的每个UILabel都会完美地更新为每个单元格，但是，UIButton并不总是正确更新，并且会显示不同的值。每个按钮都链接到IBAction，该IBAction使用segue将用户重定向到其他视图。如何修复不更新的UIButton？还是有更好的方法来实现此目的而无需按钮？

代码：

UITableViewCell类：

class ResultsTableViewCell: UITableViewCell {
@IBOutlet weak var red1: UIButton!
@IBOutlet weak var red2: UIButton!
@IBOutlet weak var red3: UIButton!
@IBOutlet weak var redScore: UILabel!
@IBOutlet weak var blue1: UIButton!
@IBOutlet weak var blue2: UIButton!
@IBOutlet weak var blue3: UIButton!
@IBOutlet weak var blueScore: UILabel!
@IBOutlet weak var teamsLabel: UILabel!
@IBOutlet weak var scoreLabel: UILabel!

    override func prepareForReuse() { //I tried doing this with no luck.
        super.prepareForReuse()
        red1?.setTitle("", for: .normal)
        red2?.setTitle("", for: .normal)
        red3?.setTitle("", for: .normal)
        blue1?.setTitle("", for: .normal)
        blue2?.setTitle("", for: .normal)
        blue3?.setTitle("", for: .normal)
    }

}

UITableView出队可重用单元格代码

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "resultsCell") as! ResultsTableViewCell
    let thisMatch = resultsDict[indexPath.row] as! [String:String]
    cell.red1?.setTitle(thisMatch["red2"], for: .normal)
    cell.red2?.setTitle(thisMatch["red2"], for: .normal)
    cell.red3?.setTitle(thisMatch["red3"], for: .normal)
    cell.blue1?.setTitle(thisMatch["blue1"], for: .normal)
    cell.blue2?.setTitle(thisMatch["blue2"], for: .normal)
    cell.blue3?.setTitle(thisMatch["blue3"], for: .normal)
    cell.redScore?.text = thisMatch["redScore"]
    cell.blueScore?.text = thisMatch["blueScore"]
    if (playerID == thisMatch["red1"]) {
        cell.red1?.underline()
    } else if (playerID == thisMatch["red2"]) {
        cell.red2?.underline()
    } else if (playerID == thisMatch["red3"]) {
        cell.red3?.underline()
    } else if (playerID == thisMatch["blue1"]) {
        cell.blue1?.underline()
    } else if (playerID == thisMatch["blue2"]) {
        cell.blue2?.underline()
    } else if (playerID == thisMatch["blue3"]) {
        cell.blue3?.underline()
    }

    return cell    
}

thisMatch

{
        "red1": "1234",
        "red2": "4567",
        "red3": "8901",
        "blue1": "2345",
        "blue2": "6789",
        "blue3": "0123",
        "redScore": "456",
        "blueScore": "789",
}

按钮应显示什么：

下划线扩展名：

extension UIButton {
func underline() {
    let attributedString = NSMutableAttributedString(string: (self.titleLabel?.text!)!)
    attributedString.addAttribute(NSAttributedString.Key.underlineStyle,
                                  value: NSUnderlineStyle.single.rawValue,
                                  range: NSRange(location: 0, length: (self.titleLabel?.text!.count)!))
    self.setAttributedTitle(attributedString, for: .normal)
}

}

Answer 1

每个Button都在重用，因此我们也应该分配不带下划线的大小写。尝试使用此代码。

 override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "resultsCell") as! ResultsTableViewCell
    let thisMatch = resultsDict[indexPath.row] as! [String:String]

    cell.redScore?.text = thisMatch["redScore"]
    cell.blueScore?.text = thisMatch["blueScore"]


    if (playerID == thisMatch["red1"]) {
        cell.red1?.setTitle(thisMatch["red1"], for: .normal)
        cell.red1?.underline()
    } else {
       cell.red1?.setTitle(thisMatch["red1"], for: .normal)
    }


    if (playerID == thisMatch["red2"]) {
        cell.red2?.setTitle(thisMatch["red2"], for: .normal)
        cell.red2?.underline()
    }else {
        cell.red2?.setTitle(thisMatch["red2"], for: .normal)
    }

    if (playerID == thisMatch["red3"]) {
        cell.red3?.setTitle(thisMatch["red3"], for: .normal)
        cell.red3?.underline()
    } else {
        cell.red3?.setTitle(thisMatch["red3"], for: .normal)
    }

    if (playerID == thisMatch["blue1"]) {
        cell.blue1?.setTitle(thisMatch["blue1"], for: .normal)
        cell.blue1?.underline()
    } else {
        cell.blue1?.setTitle(thisMatch["blue1"], for: .normal)
    }

    if (playerID == thisMatch["blue2"]) {
        cell.blue2?.setTitle(thisMatch["blue2"], for: .normal)
        cell.blue2?.underline()
    }else {
        cell.blue2?.setTitle(thisMatch["blue2"], for: .normal)
    }

     if (playerID == thisMatch["blue3"]) {
        cell.blue3?.setTitle(thisMatch["blue3"], for: .normal)
        cell.blue3?.underline()
     } else {
        cell.blue3?.setTitle(thisMatch["blue3"], for: .normal)
    }

    return cell
}

单元格重用后，UITableView不更新UIButton

1 个答案: