swift 3 error : Argument labels '(_:)' do not match any available overloads on UICollectionViewLayout (Spinning wheel)

Question

我是编程新手，我正在尝试对 CollectionView 制作圆形效果，我有以下内容：

 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
    }

但我收到错误：参数标签“(_:)”与任何可用的重载不匹配，如图所示，我做错了什么？

Answer 1

Swift 3.

语法发生了变化

使用：

IndexPath(item: i, section: 0)