在选择另一个单元格按钮时将以前的单元格按钮图像设置为其默认状态

Question

当另一个Cell Button 被选中时，我想将之前选择的Cell Button 图像更改为其默认状态。

默认状态sender.selected = false未选择按钮时

按下按钮后sender.selected = true

func collectionView(collectionView: UICollectionView,
                    cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(
                   reuseIdentifier, forIndexPath: indexPath) as! RadioCollectionViewCell

    cell.btnPlay.addTarget(self,
        action: Selector("audioControlButtonAction:"),
        forControlEvents: UIControlEvents.TouchUpInside)
    cell.btnPlay.tag = indexPath.row
    return cell
}        

func audioControlButtonAction(sender: UIButton) {

    if sender.selected == false {
        sender.selected = true 
    } else {
        sender.selected = false
    }
}

谁能告诉我如何做到这一点？ 谢谢

Answer 1

var selectIndex:Int = -1

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell 
{
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! RadioCollectionViewCell

    cell.btnPlay.addTarget(self, action: Selector("audioControlButtonAction:"), forControlEvents: UIControlEvents.TouchUpInside)
    cell.btnPlay.tag = indexPath.row+1

    return cell
}

func audioControlButtonAction(sender: UIButton) 
{
    if selectIndex != -1 && selectIndex != sender.tag
    {
        let bt:UIButton = self.view.viewWithTag(selectIndex) as! UIButton
        if bt.selected == true
        {
            bt.selected = false
        }
    }

    if sender.selected == false
    {
        sender.selected = true
        selectIndex = sender.tag
    }
    else
    {
        sender.selected = false
        selectIndex = -1
    }
 }