[英]UICollectionview Reuse Existing cell
我想生成具有100个单元格的collectionview,但是不应该在每次滚动时重新分配它,但是在我的代码中,它总是新创建单元格。
任何人都可以帮助我避免此问题,请在下面找到我的代码,
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return colorArray.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let colleCell: colorCell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! colorCell
colleCell.bgColor.backgroundColor = UIColor(red: colorArray[indexPath.row].valueForKey("Red") as! CGFloat/255, green: colorArray[indexPath.row].valueForKey("Green") as! CGFloat/255, blue: colorArray[indexPath.row].valueForKey("Blue") as! CGFloat/255, alpha: 1.0)
return colleCell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
let cell:colorCell = collectionView.cellForItemAtIndexPath(indexPath) as! colorCell
cell.layer.borderWidth = 2.0
cell.layer.borderColor = UIColor.whiteColor().CGColor
selectedColor = indexPath.row
sampleColorView.backgroundColor = UIColor(red: colorArray[indexPath.row].valueForKey("Red") as! CGFloat/255, green: colorArray[indexPath.row].valueForKey("Green") as! CGFloat/255, blue: colorArray[indexPath.row].valueForKey("Blue") as! CGFloat/255, alpha: 1.0)
self.view.backgroundColor = UIColor(red: colorArray[indexPath.row].valueForKey("Red") as! CGFloat/255, green: colorArray[indexPath.row].valueForKey("Green") as! CGFloat/255, blue: colorArray[indexPath.row].valueForKey("Blue") as! CGFloat/255, alpha: 0.7)
sampleColorView.layer.cornerRadius = 75
}
func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath)
{
let cell:colorCell = collectionView.cellForItemAtIndexPath(indexPath) as! colorCell
selectedIndex = -1;
cell.layer.borderWidth = 0.0
cell.layer.borderColor = UIColor.grayColor().CGColor
self.view.backgroundColor = UIColor.grayColor()
}
我认为它已正确重用,请仔细检查? 但是我建议设置选定/取消选定单元格样式的方法,您可以覆盖UICollectionViewCell的selected属性。
class ColorCell : UICollectionViewCell{
override var selected: Bool{
didSet {
layer.borderWidth = selected ? 2 : 0
layer.borderColor = selected ? UIColor.whiteColor().CGColor : UIColor.grayColor().CGColor
}
/* your code */
}
和UICollectionViewDelegate实现:
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
selectedColor = indexPath.row
sampleColorView.backgroundColor = /*Color*/
view.backgroundColor = /*Color*/
sampleColorView.layer.cornerRadius = 75
}
func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
selectedIndex = -1;
self.view.backgroundColor = UIColor.grayColor()
}
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