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我試圖訪問集合視圖中的單元格,然後將字體重量更改爲粗體,當用戶點擊單元格,但我似乎有一些問題。當試圖訪問我的集合視圖網點時,我收到此錯誤。無法訪問uicollectionview單元
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
但我似乎並不明白這是因爲該單元格的標識符是正確的,而且類名也是正確的。
與小區選擇
protocol InfiniteCollectionViewDelegate
{
func didSelectCellAtIndexPath(collectionView: UICollectionView, unmodifiedIndexPath: NSIndexPath, usableIndexPath: NSIndexPath)
}
處理使用協議
extension InfiniteCollectionView: UICollectionViewDelegate
{
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
infiniteDelegate?.didSelectCellAtIndexPath(self, unmodifiedIndexPath: indexPath, usableIndexPath: NSIndexPath(forRow: getCorrectedIndex(indexPath.row - indexOffset), inSection: 0))
}
}
的方式我設立集合視圖
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
}
協議
取得集合觀察室出口
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)
}
我想在標籤打印的價值,並嘗試什麼你建議通過這樣做'if let label = cell.newsTypeLbl {print(label.text)}'但是發生的所有事情似乎是在這一行中斷開let cell = navigationCollectionView!.cellForItemAtIndexPath(usableIndexPath)as! newsTypeCell' – Tunds
錯誤在說什麼? –
同樣的致命錯誤:意外地發現零,同時展開一個可選值 (lldb) – Tunds