在 Swift 中更改 UICollectionView 中的单元格背景颜色 [英] Changing cell background color in UICollectionView in Swift

问题描述

我正在使用水平集合视图来滚动日期.集合视图包含 30 个单元格.如果我选择第一个单元格，以指示选择，单元格背景颜色已从默认颜色红色变为棕色.然后，如果我选择另一个单元格，则选定的单元格颜色已从红色变为棕色.但第一个单元格 BGColor 保持不变(棕色).如何通过单击其他单元格更改为默认颜色?

I am using horizontal collection view to scroll dates. Collection view contain 30 cells. If I select first cell, to indicate the selection, cell background color has been change to brown from default color red. Then, if I select another cell, selected cell color has changed to brown from red. But first cell BGColor remains the same (brown). How can i change to default color by clicking other cell?

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

    var cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", 
   forIndexPath: indexPath) as myViewCell

    cell.date_label.text = arr_date[indexPath.item]

    }

        func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath 
       indexPath: NSIndexPath) {

        var cell = collectionView.cellForItemAtIndexPath(indexPath) as myViewCell

        if(cell.selected)
        {
            cell.backgroundColor = UIColor.brownColor()

        }
        else
        {
            cell.backgroundColor = UIColor.redColor()
        }

    }

推荐答案

可以使用collectionView函数，参数didSelectItemAtIndexPath

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath 
   indexPath: NSIndexPath) {

       let selectedCell:UICollectionViewCell = myCollectionView.cellForItemAtIndexPath(indexPath)!
       selectedCell.contentView.backgroundColor = UIColor(red: 102/256, green: 255/256, blue: 255/256, alpha: 0.66)
}

这会为选中的UICollectionViewCell创建一个常量，然后你只需改变背景的颜色

This creates a constant for the selected UICollectionViewCell, then you just change the background's color

然后要在取消选择时返回原来的颜色，你必须使用函数collectionView和参数didDeselectItemAtIndexPath

And then for return to the original color when it is deselected, you must use the function collectionView with the parameter didDeselectItemAtIndexPath

func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
        let cellToDeselect:UICollectionViewCell = myCollectionView.cellForItemAtIndexPath(indexPath)!
        cellToDeselect.contentView.backgroundColor = UIColor.clearColor()
}

然后你把颜色改成原来的！

And you change the color to the original one!

例如，这里是此代码在 filterApp 中的屏幕截图

For example here is the screenshot from this code in a filterApp

UICollectionView 示例

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