Question

背景：
我有一个带有2个投票按钮的自定义单元格的tableview，它可以从服务器中提取JSON数据，如果它说用户不允许投票，那么它会在禁用按钮的情况下加载单元格，而不是默认颜色蓝色。

问题：
当有人单击单元格上的按钮进行投票时，它会禁用/灰色单元格的按钮，但是当我滚动单元格并向后滚动时，它只会默认返回启用的蓝色按钮，直到我从表格中拉出来刷新它再次获取服务器数据。

我认为解决方案：
我应该修改存储用户是否可以投票的本地数组（disableArray）在点击的按钮的indexPath，但我不知道如何。

那么如何从我的自定义tableViewCell子类中的投票函数中访问和修改 disableArray ？

这是我的自定义tableViewCell的代码：

 import UIKit

    class MainTableViewCell: UITableViewCell {

        @IBOutlet weak var totalvoteLabel: UILabel!
        @IBOutlet weak var upButton: UIButton!
        @IBOutlet weak var downButton: UIButton!

        var number: Int?{
            return Int(totalvoteLabel.text!)
        }

        override func awakeFromNib() {
            super.awakeFromNib()
        }


        @IBAction func downvote(sender: AnyObject) {
            totalvoteLabel.text = String(number! - 1)
            upButton.userInteractionEnabled = false
            downButton.userInteractionEnabled = false
            upButton.setImage(UIImage(named: "upArrowGray.png"), forState: UIControlState.Normal)
            downButton.setImage(UIImage(named: "downArrowGray.png"), forState: UIControlState.Normal)
            totalvoteLabel.textColor =  UIColor(red: 188/255, green: 183/255, blue: 174/255, alpha: 1.0)

        }
        @IBAction func upvote(sender: AnyObject) {
            totalvoteLabel.text = String(number! + 1)
            upButton.userInteractionEnabled = false
            downButton.userInteractionEnabled = false
            upButton.setImage(UIImage(named: "upArrowGray.png"), forState: UIControlState.Normal)
            downButton.setImage(UIImage(named: "downArrowGray.png"), forState: UIControlState.Normal)
            totalvoteLabel.textColor =  UIColor(red: 188/255, green: 183/255, blue: 174/255, alpha: 1.0)      
        }
    }

和我的tableView的代码：

   func numberOfSectionsInTableView(tableView: UITableView) -> Int {
            return 1
        }
        func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
                           return postArray.count
            }

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

            let cell : MainTableViewCell! = tableView.dequeueReusableCellWithIdentifier("MainTableViewCell") as! MainTableViewCell

            cell.totalvoteLabel.text = voteArray[indexPath.row]
            cell.ID = idArray[indexPath.row]

            if(disableArray[indexPath.row] == "1"){
                cell.upButton.userInteractionEnabled = false
                cell.downButton.userInteractionEnabled = false
                cell.upButton.setImage(UIImage(named: "upArrowGray.png"), forState: UIControlState.Normal)
                cell.downButton.setImage(UIImage(named: "downArrowGray.png"), forState: UIControlState.Normal)
                cell.totalvoteLabel.textColor =  UIColor(red: 188/255, green: 183/255, blue: 174/255, alpha: 1.0)
                cell.disable = true
            }else{
                cell.upButton.userInteractionEnabled = true
                cell.downButton.userInteractionEnabled = true
                cell.upButton.setImage(UIImage(named: "upArrow.png"), forState: UIControlState.Normal)
                cell.downButton.setImage(UIImage(named: "downArrow.png"), forState: UIControlState.Normal)
                cell.totalvoteLabel.textColor =  UIColor(red: 43/255, green: 192/255, blue: 228/255, alpha: 1.0)
            }

            return cell as MainTableViewCell
        }

Answer 1

是的，每次点击其中一个按钮时，您都应该更新disableArray。你可以通过授权实现这一目标。

创建一个采用NSIndexPath
在MainTableViewCell内为indexPath和委托
调用委托并从upVote和downVote方法传递indexPath。

现在MainTableViewCell的代码应如下所示：

import UIKit

//**** The Protocol ****
protocol MyCellProtocol {
    func updateDisableArray (indexPath: NSIndexPath)
}

class MainTableViewCell: UITableViewCell {

    @IBOutlet weak var totalvoteLabel: UILabel!
    @IBOutlet weak var upButton: UIButton!
    @IBOutlet weak var downButton: UIButton!

    var number: Int?{
        return Int(totalvoteLabel.text!)
    }

    //**** Variable to store the indexPath ****
    var indexPath: NSIndexPath!

    //**** Variable for the delegate ****
    var cellDelegate: MyCellProtocol?

    override func awakeFromNib() {
        super.awakeFromNib()
    }


    @IBAction func downvote(sender: AnyObject) {
        totalvoteLabel.text = String(number! - 1)
        upButton.userInteractionEnabled = false
        downButton.userInteractionEnabled = false
        upButton.setImage(UIImage(named: "upArrowGray.png"), forState: UIControlState.Normal)
        downButton.setImage(UIImage(named: "downArrowGray.png"), forState: UIControlState.Normal)
        totalvoteLabel.textColor =  UIColor(red: 188/255, green: 183/255, blue: 174/255, alpha: 1.0)

        //****  Call the delegate method with the indexPath ****
        self.cellDelegate?.updateDisableArray(indexPath)

    }
    @IBAction func upvote(sender: AnyObject) {
        totalvoteLabel.text = String(number! + 1)
        upButton.userInteractionEnabled = false
        downButton.userInteractionEnabled = false
        upButton.setImage(UIImage(named: "upArrowGray.png"), forState: UIControlState.Normal)
        downButton.setImage(UIImage(named: "downArrowGray.png"), forState: UIControlState.Normal)
        totalvoteLabel.textColor =  UIColor(red: 188/255, green: 183/255, blue: 174/255, alpha: 1.0)

        //****  Call the delegate method with the indexPath ****
        self.cellDelegate?.updateDisableArray(indexPath)      
    }
}

在表格视图的cellForRowAtIndexPath方法中，配置Cell的cellDelegate和indexPath属性，如下所示：

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

    let cell : MainTableViewCell! = tableView.dequeueReusableCellWithIdentifier("MainTableViewCell") as! MainTableViewCell

    //**** Set self to be the cellDelegate ****
    cell.cellDelegate = self

    //**** Set the indexPath property of the cell ****
    cell.indexPath = indexPath

    cell.totalvoteLabel.text = voteArray[indexPath.row]

使包含tableView的ViewController和disableArray确认为MyCellProtocol：
```
class ViewControllerOfYourTableView: UIViewController, MyCellProtocol {
```

在视图控制器中实现MyCellProtocol。您可以在cellForRowAtIndexPath方法之后立即执行此操作：

func updateDisableArray (indexPath: NSIndexPath) {
    //**** update the array at the indexPath of the clicked button ****
    self.disableArray[indexPath.row] = "1"
}

当单元格滚动时，Tableview设置会消失

1 个答案: