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我试图访问集合视图中的单元格,然后将字体重量更改为粗体,当用户点击单元格,但我似乎有一些问题。当试图访问我的集合视图网点时,我收到此错误。无法访问uicollectionview单元
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
但我似乎并不明白这是因为该单元格的标识符是正确的,而且类名也是正确的。
与小区选择
protocol InfiniteCollectionViewDelegate
{
func didSelectCellAtIndexPath(collectionView: UICollectionView, unmodifiedIndexPath: NSIndexPath, usableIndexPath: NSIndexPath)
}
处理使用协议
extension InfiniteCollectionView: UICollectionViewDelegate
{
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
infiniteDelegate?.didSelectCellAtIndexPath(self, unmodifiedIndexPath: indexPath, usableIndexPath: NSIndexPath(forRow: getCorrectedIndex(indexPath.row - indexOffset), inSection: 0))
}
}
的方式我设立集合视图
func cellForItemAtIndexPath(collectionView: UICollectionView, dequeueIndexPath: NSIndexPath, usableIndexPath: NSIndexPath) -> UICollectionViewCell
{
let cell = navigationCollectionView.dequeueReusableCellWithReuseIdentifier("newsCell", forIndexPath: dequeueIndexPath) as! newsTypeCell
cell.newsTypeLbl.text = cellItems[usableIndexPath.row]
return cell
}
协议
取得集合观察室出口
func didSelectCellAtIndexPath(collectionView: UICollectionView, unmodifiedIndexPath: NSIndexPath, usableIndexPath: NSIndexPath)
{
navigationCollectionView.scrollToItemAtIndexPath(unmodifiedIndexPath, atScrollPosition: UICollectionViewScrollPosition.CenteredHorizontally, animated: true)
let cell = navigationCollectionView!.cellForItemAtIndexPath(usableIndexPath) as! newsTypeCell
print(cell.newsTypeLbl.text)
}
我想在标签打印的价值,并尝试什么你建议通过这样做'if let label = cell.newsTypeLbl {print(label.text)}'但是发生的所有事情似乎是在这一行中断开let cell = navigationCollectionView!.cellForItemAtIndexPath(usableIndexPath)as! newsTypeCell' – Tunds
错误在说什么? –
同样的致命错误:意外地发现零,同时展开一个可选值 (lldb) – Tunds