Question

我在UITableViewCell中有一个UIButton，一旦按下按钮，图像就会改变。虽然所选按钮按预期选择，但一旦UITableView滚动，所选图像就会消失，因为细胞会被重复使用。

我在编写逻辑时遇到了麻烦。请帮忙。

我的代码如下，在Swift 3中。

CellForRow：

func addSongButtonIdentifier(cell: UITableViewCell, _ index: Int) {
    let addButton = cell.viewWithTag(TABLE_CELL_TAGS.addButton) as! UIButton

    //accessibilityIdentifier is used to identify a particular element which takes an input parameter of a string

    //assigning the indexpath button
    addButton.accessibilityIdentifier = String (index)
    // print("visible Index:",index)
    print("Index when scrolling :",addButton.accessibilityIdentifier!)

    addButton.setImage(UIImage(named: "correct"), for: UIControlState.selected)
    addButton.setImage(UIImage(named: "add_btn"), for: UIControlState.normal)

    addButton.isSelected = false
    addButton.addTarget(self, action: #selector(AddToPlaylistViewController.tapFunction), for:.touchUpInside)
}

这是创建单元格的位置：

func tapFunction(sender: UIButton) {
    print("IndexOfRow :",sender.accessibilityIdentifier!)
    // if let seporated by a comma defines, if let inside a if let. So if the first fails it wont come to second if let


    if let rowIndexString =  sender.accessibilityIdentifier, let rowIndex = Int(rowIndexString) {
    self.sateOfNewSongArray[rowIndex] = !self.sateOfNewSongArray[rowIndex]//toggle the state when tapped multiple times
    }
    sender.isSelected = !sender.isSelected //image toggle
    print(" Array Data: ", self.sateOfNewSongArray)

    selectedSongList.removeAll()

    for (index, element) in self.sateOfNewSongArray.enumerated() {
        if element{
            print("true:", index)

            selectedSongList.append(songDetailsArray[index])

            print("selectedSongList :",selectedSongList)
        }
    }
}

点击功能：

SELECT TABLE_NAME, CONSTRAINT_NAME FROM USER_CONSTRAINTS 
WHERE R_OWNER = 'OWNERNAME' AND STATUS ='ENABLED' AND CONSTRAINT_TYPE = 'R' 
AND R_CONSTRAINT_NAME IN ( SELECT CONSTRAINT_NAME FROM ALL_CONSTRAINTS  
WHERE CONSTRAINT_TYPE IN ('P', 'U') AND TABLE_NAME = 'REGIONS' 
AND OWNER = 'OWNERNAME' )

Answer 1

您需要有一个数组，用于存储选择的索引，例如您拥有的selectedSongList数组。然后在你的cellForRow方法中你需要使用来自这个数组的bool proparty给你的按钮选择或取消选择状态，或者在你的addSongButtonIdentifier方法中选择状态需要

addButton.isSelected = selectedSongList.contains(indexPath.row)

Answer 2

创建一个Model类来填充UITableView并在该模型中获取UIImage varaivals，它将保存单元格的当前图像。单击按钮操作时，只需使用当前图像更改UIImage变量。

滚动时UITableViewCell图像消失

2 个答案: