ios - 迅速3错误:参数标签'(_ :)'与UICollectionViewLayout(转盘)上任何可用的重载都不匹配

Question

我是编程新手，我想对CollectionView做出圆形效果，我有以下几点:

 override func prepare()
{
    super.prepare()

    let centerX = collectionView!.contentOffset.x + (collectionView!.bounds.width / 2.0)
    attributesList = (0..<collectionView!.numberOfItems(inSection: 0)).map { (i)
        -> CircularLayoutAttributes in
        // 1
        let attributes = CircularLayoutAttributes(forCellWithIndexPath: IndexPath(forItem: i, inSection: 0))
        attributes.size = self.itemSize
        // 2
        attributes.center = CGPoint(x: centerX, y: self.collectionView!.bounds.midY)
        // 3
        attributes.angle = self.anglePerItem*CGFloat(i)
        return attributes
    }

但是我得到了错误:参数标签'(_ :)'与任何可用的重载都不匹配，如图片所示，我在做什么错？

Answer 1

语法在Swift 3中已更改。

用:
IndexPath(item: i, section: 0)