在这里,我正在尝试突出显示选择的UICollectionViewCell,如图所示.我尝试将边框添加到选定的单元格,边框位于单元格内容视图中.这是我的尝试：
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
let cell = priorityCollectionView.cellForItem(at: indexPath) as? BCPriorityListCollectionViewCell
let borderWidth: CGFloat = 6
cell?.contentView.frame = (cell?.labelBackground.frame.insetBy(dx: +borderWidth,dy: +borderWidth))!
cell?.contentView.layer.borderColor = cell?.backgroundColor?.cgColor
cell?.contentView.layer.borderWidth = borderWidth
}
func collectionView(_ collectionView: UICollectionView,didDeselectItemAt indexPath: IndexPath) {
let cell = priorityCollectionView.cellForItem(at: indexPath) as? BCPriorityListCollectionViewCell
let borderWidth: CGFloat = 0
cell?.contentView.frame = (cell?.labelBackground.frame.insetBy(dx: +borderWidth,dy: +borderWidth))!
cell?.contentView.layer.borderColor = UIColor.clear.cgColor
cell?.contentView.layer.borderWidth = borderWidth
}
这该怎么做？
解决方法
只需使用变换比例缩放选定的单元格,而不是为所选单元格添加边框宽度.在didSelect中编写此代码：
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
let selectedCell = priorityCollectionView.cellForItem(at: indexPath) as? BCPriorityListCollectionViewCell
priorityCollectionView.bringSubview(toFront: selectedCell!)
UIView.animate(withDuration: 0.2,delay: 0,usingSpringWithDamping: 5,initialSpringVelocity: 0,options: [],animations: {
selectedCell?.transform = CGAffineTransform(scaleX: 1.2,y: 2)
})
}
在didDeselect中：
func collectionView(_ collectionView: UICollectionView,didDeselectItemAt indexPath: IndexPath) {
let unselectedCell = priorityCollectionView.cellForItem(at: indexPath) as? BCPriorityListCollectionViewCell
UIView.animate(withDuration: 0.2,animations: {
unselectedCell?.transform = .identity
})
}
结果：