xcode UICollectionViewCell 快速选择多个单元格
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UICollectionViewCell Selecting multiple cells swift
提问by Mohamed Horani
I'm trying to make an app to select multiple Cells, so let's assume we have 9 cells Indexed from 0 to 8.
我正在尝试制作一个应用程序来选择多个单元格，所以假设我们有 9 个单元格索引从 0 到 8。
Here is what i was trying to do...
这就是我想要做的......
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
var cell = collectionView.cellForItemAtIndexPath(indexPath)
if cell?.selected == true {
cell?.backgroundColor = UIColor.orangeColor()
}
}
And Deselect Func()
并取消选择 Func()
func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
var cell = collectionView.cellForItemAtIndexPath(indexPath)
cell?.backgroundColor = UIColor.clearColor()
}
It's simple enough if a user selects a cell -> orange if deselects a cell -> clearColor 'white' So yea this code is working except
如果用户选择一个单元格 -> 如果取消选择一个单元格 -> 橙色 -> clearColor 'white' 所以是的，这段代码正在工作，除了
If a user selects cell 0, it also change the color of cell 6, "keep in mind cell 6 is not selected it just change it's appearance". Same for Cell 1 if it selected cell 7 changes and so on, also if i deselect either cell 0 or cell 6 both Changes.
如果用户选择单元格 0，它也会更改单元格 6 的颜色，“请记住，单元格 6 没有被选中，它只是改变了它的外观”。如果单元格 1 选择了单元格 7 更改等，则单元格 1 也是如此，如果我取消选择单元格 0 或单元格 6 都更改。
So i've tried cell?.selected == true, UICollectionView.allowsMultipleSelection = trueboth properties did not work for me.
所以我试过了cell?.selected == true，UICollectionView.allowsMultipleSelection = true这两个属性都不适合我。
am i doing something Wrong ?
is it an issue related to Cell Reuse ? if so could you explain this behavior ?
难道我做错了什么 ？
这是一个与细胞重用有关的问题吗？如果是这样，你能解释一下这种行为吗？
回答by Munahil
Do this :
做这个 ：
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
var cell = collectionView.cellForItemAtIndexPath(indexPath)
if cell?.selected == true {
cell?.backgroundColor = UIColor.orangeColor()
}
else
cell?.backgroundColor = UIColor.clearColor()
}
Also make a custom cell for UICollectionViewCell. Also change in your cellForItemAtIndexPathfunction :
还为 UICollectionViewCell 创建一个自定义单元格。也改变你的cellForItemAtIndexPath功能：
if cell?.selected == true
cell?.backgroundColor = UIColor.orangeColor()
else
cell?.backgroundColor = UIColor.clearColor()
回答by glemoulant
First set collectionView.allowsMultipleSelection
第一套 collectionView.allowsMultipleSelection
then for exemple to change border on click :
然后例如在单击时更改边框：
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let selectedCell : UICollectionViewCell = collectionView.cellForItem(at: indexPath)!
selectedCell.layer.borderWidth = 2
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
let unselectedCell : UICollectionViewCell = collectionView.cellForItem(at: indexPath)!
unselectedCell.layer.borderWidth = 0
}
