Question

我试图创建一个自动滚动的无限滚动UICollectionView。当在collectionView中点击一个单元格时，我需要删除该单元格。

我有一些工作，但问题是，每次它到达collectionView的末尾，当它应该循环＆＃39;结束了，它结结巴巴并跳了起来。我知道这是因为我使用collectionView.reloadData()。我的问题是，有没有其他方法可以在不调用reloadData的情况下执行此操作，因此它不会跳转？

（此处＆＃39; s a video of the problem）

这是我的代码：

class CollectionViewController: UICollectionViewController {
var animationTimer : NSTimer!
var data = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p"]

override func viewDidLoad() {
    super.viewDidLoad()
    startTimer()
}


func startTimer() {
    animationTimer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: "onFire:", userInfo: nil, repeats: true)
}

func onFire(sender : AnyObject) {
    collectionView?.contentOffset = CGPointMake((collectionView?.contentOffset.x)! + 1, 0)
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func scrollViewDidScroll(scrollView: UIScrollView) {

    let xContentOffset = scrollView.contentOffset.x
    let contentHeight = scrollView.contentSize.width - (collectionView?.frame.width)!

    if xContentOffset >= contentHeight {
        collectionView?.reloadData()
        collectionView?.contentOffset = CGPointMake(0, 0)
    }
}

override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return data.count
}


override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! CollectionViewCell

    cell.label.text = data[indexPath.row]

    return cell
}

override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    data.removeAtIndex(indexPath.row)
    collectionView.deleteItemsAtIndexPaths([indexPath])
}

谢谢！

创建无限滚动的UICollectionView而不会出现断断续续的情况

0 个答案: