快速在表格视图上按下时如何更改标签文本的颜色？

Question

I have a UITableView with a cell that has 1 UILabel in it. I want the cell labels text color to change when the cell is pressed. How do I do that?

This is what I tried:

 func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
        let cell:UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as UITableViewCell

        let label:UILabel = cell.viewWithTag(1) as UILabel
        label.textColor = UIColor(red: 46/255.0, green: 204/255.0, blue: 113/255.0, alpha: 1.0)
        cell.reloadInputViews()



    }

Answer 1

Subclass UITableViewCell and overwrite setSelected.

@IBOutlet weak var label: UILabel!
override func setSelected(selected: Bool, animated: Bool) {
  if (selected) {
    label.textColor = UIColor.redColor()
  } else {
    label.textColor = UIColor.blackColor()
  }
}

Answer 2

Implement the didDeselectRowAtIndexPath delegate method. In this method you should set the label back to the normal color.

func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
  let cell = tableView.cellForRowAtIndexPath(indexPath)
  let label: UILabel = cell.viewWithTag(1) as UILabel
  label.textColor = UIColor.redColor()
}

override func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
  let cell = tableView.cellForRowAtIndexPath(indexPath)
  let label: UILabel = cell.viewWithTag(1) as UILabel
  label.textColor = UIColor.blackColor()
}

Also, remove .reloadInputViews() unless you actually need it. This is probably wiping any updating of textColor.

Answer 3

Swift 3 version looks like:

override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)
    if (selected) {
         self.artistLabel.textColor = UIColor.lightGray
    } else {
         self.artistLabel.textColor = UIColor.black
    }
}

just mention that this is much clear and better way to do it than in didSelectRowAtIndexPath

Answer 4

What I generally uses for such situations is overriding setHighlighted in UITableViewCell subclass as:

override func setHighlighted(_ highlighted: Bool, animated: Bool) {
    super.setHighlighted(highlighted, animated: animated)
    label.textColor = UIColor.redColor()
}

For this, you have to use custom table view cells to override particular method.