我以10个单元格的UICollectionView为例。我想为选定的单元格添加边框,稍后,在选择另一个单元格时,要删除先前的边框,并向新的选定单元格添加边框。
我怎样才能做到这一点?
我已经试过了:
var selected = [NSIndexPath]()
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
self.imageView.image = applyFilter(self.colorCubeFilterFromLUT("\(self.LUTs[indexPath.row])")!, image: self.image!)
self.selected.append(indexPath)
}
func collectionView(collectionView: UICollectionView, didHighlightItemAtIndexPath indexPath: NSIndexPath) {
let cell = self.filtersCollectionView.cellForItemAtIndexPath(indexPath) as! FiltersCollectionViewCell
cell.imageView.layer.borderWidth = 3.0
cell.imageView.layer.borderColor = UIColor.brownColor().CGColor
}
func collectionView(collectionView: UICollectionView, didUnhighlightItemAtIndexPath indexPath: NSIndexPath) {
if self.selected.count > 1 && indexPath == self.selected[self.selected.count - 1] {
let cell = self.filtersCollectionView.cellForItemAtIndexPath(indexPath) as! FiltersCollectionViewCell
cell.imageView.layer.borderWidth = 0.0
cell.imageView.layer.borderColor = UIColor.clearColor().CGColor
}
}
但它不起作用。我做错了什么?
最佳答案
您可以将所选的indexPath
保存到变量中,并在cellForItemAtIndexPath
中检查当前indexPath
是否等于所选的索引路径(每次选择collectionView
时都需要重新加载)
var selectedIndexPath: NSIndexPath{
didSet{
collectionView.reloadData()
}
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
selectedIndexPath = indexPath
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
var borderColor: CGColor! = UIColor.clearColor().CGColor
var borderWidth: CGFloat = 0
if indexPath == selectedIndexPath{
borderColor = UIColor.brownColor().CGColor
borderWidth = 1 //or whatever you please
}else{
borderColor = UIColor.clearColor().CGColor
borderWidth = 0
}
cell.imageView.layer.borderWidth = borderWidth
cell.imageView.layer.borderColor = borderColor
}
关于ios - 如何在didSelect上向UICollectionViewCell添加边框,并在选择另一个UICollectionViewCell上删除边框?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/37775839/