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Swift 如何将视图TableViewCell强制转换为UIGestureView

swift uitableview swift3 uiview

Swift 如何将视图TableViewCell强制转换为UIGestureView,swift,uitableview,swift3,uiview,uigesturerecognizer,Swift,Uitableview,Swift3,Uiview,Uigesturerecognizer,我正在尝试更改手势视图点击上的“我的表格视图”单元格内容，但出现了错误 线程1：信号SIGABRT 无法将“UILabel”（0x117f4ad68）类型的值强制转换为“MyApplication.Read” func ReadAnswer(_ sender: UIGestureRecognizer) { let CellIndex = sender.view?.tag print(CellIndex!) let test = sender.view as! Read!

我正在尝试更改手势视图点击上的“我的表格视图”单元格内容，但出现了错误

线程1：信号SIGABRT

无法将“UILabel”（0x117f4ad68）类型的值强制转换为“MyApplication.Read”

func ReadAnswer(_ sender: UIGestureRecognizer)  {
    let CellIndex = sender.view?.tag
    print(CellIndex!)
    let test = sender.view as! Read!  // This produces error

    test?.comment.text = "You have clicked on cell \(CellIndex)"
}

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

    mycell.comment.tag = indexPath.row
    mycell.comment.text = streamsModel.Posts[indexPath.row]

    let Gesture = UITapGestureRecognizer(target: self, action: #selector(ReadAnswer(_:)))
    Gesture.delegate = self as? UIGestureRecognizerDelegate

    mycell.comment.addGestureRecognizer(Gesture)

    return cell
}

func ReadAnswer(_ sender: UIGestureRecognizer)  {
    let CellIndex = sender.view?.tag
    print(CellIndex!)


    let test = sender.view as! Read!  // This produces error

    test?.comment.text = "You have clicked on cell \(CellIndex)"

}
再次点击标签我想改变标签的内容，说你点击了单元格（CellIndex）。我可以在每次单击时获得正确的索引，但是在“Let Test”（让测试）中会出现错误。

一些背景点：不要每次添加单元格时都添加手势识别器。随着你的细胞被回收，你将拥有越来越多的手势识别器。在自定义单元格类中添加一个标志，告诉您是否已经添加了手势识别器，如果尚未添加，则仅添加一个

（不会阻止代码工作，但仍然很重要）。Swift中的方法名称和变量名称应以小写字母开头。类和类型名称应以大写字母开头

至于你的强制施法失败的原因，听起来像是你牢房的
mycell.comment
出口不是你想要的类型
Read
。根据错误，它的类型是
UILabel
，而不是
Read
（不管是什么）。但是，您没有为我们提供足够的信息来帮助处理该零件。您需要解释如何设置my class的出口，还需要解释什么是
读取类型。
您被添加到
UILabel
<代码>注释
是
UILabel

let Gesture = UITapGestureRecognizer(target: self, action: #selector(ReadAnswer(_:)))
Gesture.delegate = self as? UIGestureRecognizerDelegate

mycell.comment.addGestureRecognizer(Gesture)
在手势动作中，sender.view应该是UILabel。因此发生了以下错误

无法将“UILabel”（0x117f4ad68）类型的值强制转换为“MyApplication.Read”

func ReadAnswer(_ sender: UIGestureRecognizer)  {
    let CellIndex = sender.view?.tag
    print(CellIndex!)
    let test = sender.view as! Read!  // This produces error

    test?.comment.text = "You have clicked on cell \(CellIndex)"
}

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

    mycell.comment.tag = indexPath.row
    mycell.comment.text = streamsModel.Posts[indexPath.row]

    let Gesture = UITapGestureRecognizer(target: self, action: #selector(ReadAnswer(_:)))
    Gesture.delegate = self as? UIGestureRecognizerDelegate

    mycell.comment.addGestureRecognizer(Gesture)

    return cell
}

func ReadAnswer(_ sender: UIGestureRecognizer)  {
    let CellIndex = sender.view?.tag
    print(CellIndex!)


    let test = sender.view as! Read!  // This produces error

    test?.comment.text = "You have clicked on cell \(CellIndex)"

}
解决问题

   func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        return staticArrayy.count
    }

    //Setting cells data
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell = self.myDemoTableView.dequeueReusableCell(withIdentifier: "Cell") as! CustomTableViewCell

        ///Adding Gesture
        let Gesture : UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tableViewVC.ReadAnswer(_:)))
        Gesture.numberOfTapsRequired = 1
        Gesture.cancelsTouchesInView = false
        Gesture.delegate = self
        cell.comment.addGestureRecognizer(Gesture)

        cell.comment.isUserInteractionEnabled = true

        ///Assuming mycell.comment.text is a Label Connected
        cell.comment.text = staticArrayy[indexPath.row]

        return cell
    }

//Setting height of cells
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{        
    return 60
}
我们必须用字典来解释这件事。因此，我们可以避免tableView重用。你可以给我的Uisteper。逻辑如下

var textDict = [Int : String]()
override func viewDidLoad() {
    super.viewDidLoad()

    for i in 0..<70 // numberOfRows
    {
        textDict[i] = "Hello"
    }
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return 70
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "table", for: indexPath) as! TblTableViewCell

    let Gesture = UITapGestureRecognizer(target: self, action: #selector(ReadAnswer))
    Gesture.delegate = self as? UIGestureRecognizerDelegate

    cell.commentLbl.tag = indexPath.row
    cell.commentLbl.isUserInteractionEnabled = true
    cell.commentLbl.addGestureRecognizer(Gesture)

    cell.commentLbl.text = textDict[indexPath.row]

    return cell
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

    return 50
}

@objc func ReadAnswer(_ sender: UIGestureRecognizer)  {

    let CellIndex : Int = (sender.view?.tag)!

    textDict[CellIndex] = "You have clicked on cell \(CellIndex)"

    tblView.reloadData()

}

var textDict=[Int:String]（）
重写func viewDidLoad（）{
super.viewDidLoad（）
对于0..Int中的i{
返回70
}
func tableView（tableView:UITableView，cellForRowAt indexath:indexPath）->UITableViewCell{
让cell=tableView.dequeueReusableCell（标识符为：“table”，for:indexPath）作为！TblTableViewCell
让手势=UITapGestureRecognitor（目标：自我，操作：#选择器（ReadAnswer））
signature.delegate=self-as？UIgestureRecognitizerDelegate
cell.commentLbl.tag=indexPath.row
cell.commentLbl.isUserInteractionEnabled=true
cell.commentLbl.AddGestureRecognitor（手势）
cell.commentLbl.text=textDict[indexPath.row]
返回单元
}
func tableView（tableView:UITableView，heightForRowAt indexath:indexPath）->CGFloat{
返回50
}
@objc func ReadAnswer（\发送方：UIgestureRecognitor）{
让CellIndex:Int=（sender.view？.tag）！
textDict[CellIndex]=“您已单击单元格\（CellIndex）”
tblView.reloadData（）
}
在您的
ReadAnswer
函数中，
sender
引用了它所附加到的视图。该视图是您命名的
注释
的
UILabel

按如下方式更改您的功能：


func ReadAnswer(_ sender: UIGestureRecognizer)  {
    let CellIndex = sender.view?.tag
    print(CellIndex!)
    if let test = sender.view as? UILabel {

        test.comment.text = "You have clicked on cell \(CellIndex)"
    }
}



这是我刚刚写的测试答案

我的阵列


var staticArrayy = ["1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1","1"]


我的tableview代表


   func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        return staticArrayy.count
    }

    //Setting cells data
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell = self.myDemoTableView.dequeueReusableCell(withIdentifier: "Cell") as! CustomTableViewCell

        ///Adding Gesture
        let Gesture : UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tableViewVC.ReadAnswer(_:)))
        Gesture.numberOfTapsRequired = 1
        Gesture.cancelsTouchesInView = false
        Gesture.delegate = self
        cell.comment.addGestureRecognizer(Gesture)

        cell.comment.isUserInteractionEnabled = true

        ///Assuming mycell.comment.text is a Label Connected
        cell.comment.text = staticArrayy[indexPath.row]

        return cell
    }

//Setting height of cells
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{        
    return 60
}


点击手势处理程序


@objc func ReadAnswer(_ sender: UITapGestureRecognizer)
    {
        //Get position in View
        let myPosition = sender.location(in: self.myDemoTableView)

        //Get current Index Path
        let indexPath : IndexPath = self.myDemoTableView.indexPathForRow(at: myPosition)!

        //Time to Show Answer
        var cell = self.myDemoTableView.dequeueReusableCell(withIdentifier: "Cell") as! CustomTableViewCell
        cell = self.myDemoTableView.cellForRow(at: indexPath) as! CustomTableViewCell
        cell.comment.text = "You have clicked on cell \(indexPath.row)"

        //Re-Deque issue
        //Update the Array Content at same Index whose value is changed
        self.staticArrayy[indexPath.row] = cell.comment.text!
    }


我的手机类


import UIKit

class CustomTableViewCell: UITableViewCell
{

    @IBOutlet weak var comment: UILabel!


    override func awakeFromNib()
    {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool)
    {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}


输出：

第一次加载tableView时



单击TableView单元格时


你能添加30多个单元格并检查吗？是否重复使用？同样，你能解释更多吗？我最多可以添加30行，下一步要做什么？单击，第1行，更改标签文本，然后滚动到底部，看到任何差异吗？好的，我得到了重新确定的问题，解决了检查更新的答案，谢谢你的信息，我错过了做这个示例好的，请核对我的答案。两者都是相同的，