UICollectionView 自定义水平分页布局

Question

[![collectionview 示例][1]][1]

我正在尝试使用集合视图来模拟此行为。我已经开始使用这种方法，它让我更接近了。尽管当我在水平分页 CollectionView 上越来越向右滑动时，内容越来越向左移动。单元格之间的间距也关闭了。我认为它需要自定义布局，但不确定。

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {

    return CGSize(width: collectionView.frame.width - 20, height: collectionView.frame.height - 20)

}

Answer 1

这取决于3个因素 1）部分插图 2) 单元间距 3) 单元格大小

每个人的任何改变都必须改变别人针对您的情况

1) 左右设置为20

2) 将单元格间距设置为 10

func collectionView(collectionView: UICollectionView,
    layout collectionViewLayout: UICollectionViewLayout,
    minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
        return 10
}
func collectionView(collectionView: UICollectionView, layout
    collectionViewLayout: UICollectionViewLayout,
    minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
        return 10
}

3) 设置单元格大小

func collectionView(collectionView: UICollectionView,
    layout collectionViewLayout: UICollectionViewLayout,
    sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        return CGSize(width: collectionView.frame.width / 1.15 ,height: collectionView.frame.height)
}

4) 这将使单元格在屏幕中居中

func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

    let pageWidth:CGFloat = scrollView.frame.width / 1.15 + cellSpacing ;

    let currentOffset:CGFloat = scrollView.contentOffset.x;
    let targetOffset:CGFloat = targetContentOffset.memory.x
    var newTargetOffset:CGFloat = 0;

    if targetOffset > currentOffset
    {
        newTargetOffset = ceil(currentOffset / pageWidth) * pageWidth;
    }
    else
    {
        newTargetOffset = floor(currentOffset / pageWidth) * pageWidth;
    }

    if newTargetOffset < 0
    {
        newTargetOffset = 0
    }
    else if newTargetOffset > scrollView.contentSize.width
    {
    newTargetOffset = scrollView.contentSize.width;
    }

    targetContentOffset.memory.x = currentOffset

    scrollView.setContentOffset(CGPointMake(newTargetOffset, 0), animated: true)

}

Answer 2

我更改了一些@Mohamed 的解决方案，它非常适合我：

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

    let cellSpacing: CGFloat = self.collectionView(self.collectionView, layout: self.collectionView.collectionViewLayout, minimumInteritemSpacingForSectionAt: 0)
    let pageWidth: CGFloat = self.pageWidth + cellSpacing

    let currentOffset = scrollView.contentOffset.x
    let targetOffset = targetContentOffset.pointee.x
    targetContentOffset.pointee.x = currentOffset

    var pageNumber = 0
    if targetOffset > currentOffset {
        pageNumber = Int(ceil(currentOffset / pageWidth))
    }
    else {
        pageNumber = Int(floor(currentOffset / pageWidth))
    }

    let indexPath = IndexPath(row: pageNumber, section: 0)
    self.collectionView.scrollToItem(at: indexPath, at: UICollectionView.ScrollPosition.centeredHorizontally, animated: true)
}

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