我怎样才能突出显示一个项目？

Question

我有标签的集合视图，您可以选择标签。目前您可以选择任意多个，但我想将其限制为只有一个。只能选择一个标签。如果您选择一个标签并单击另一个标签，则之前的标签将返回到原始颜色，新选择的标签将更改颜色。

 func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell: celltell = tc.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! celltell

        cell.t.text = av[indexPath.item]
        cell.t.layer.borderColor = UIColor.blackColor().CGColor
        cell.t.backgroundColor = UIColor.whiteColor
        cell.t.layer.borderWidth = 0.5
        cell.t.tag = indexPath.row

        let tapGesture = UITapGestureRecognizer(target: self, action: "tme:")
        cell.t.addGestureRecognizer(tapGesture)
        cell.t.userInteractionEnabled = true

    return cell
}

 func tme(gest: UITapGestureRecognizer){

    let label: UILabel = gest.view as! UILabel
    label.backgroundColor = UIColor.redColor
    label.textColor = UIColor.whiteColor()
    checker = label.tag

}

Answer 1

take gloable variable at top of viewDidLoad
Var selectedIndex : Int  

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell: celltell = tc.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! celltell

        cell.t.text = av[indexPath.item]
        cell.t.layer.borderColor = UIColor.blackColor().CGColor
        cell.t.backgroundColor = UIColor.whiteColor
        cell.t.layer.borderWidth = 0.5
        cell.t.tag = indexPath.row
        if(indexPath.row == selectedIndex){
            label.backgroundColor = UIColor.redColor
           label.textColor = UIColor.whiteColor()

        }
        else{
            label.backgroundColor = UIColor.whiteColor
           label.textColor = UIColor.redColor()
        }
        let tapGesture = UITapGestureRecognizer(target: self, action: "tme:")
        cell.t.addGestureRecognizer(tapGesture)
        cell.t.userInteractionEnabled = true

    return cell
}

 func tme(gest: UITapGestureRecognizer){

    let label: UILabel = gest.view as! UILabel
    selectedIndex = label.tag
    self.collectionView.reloadData();
}

Answer 2

只需为标签设置突出显示的颜色。