getCurrentIndex 方法 在阿语环境下就 无法实现了

[blockshark]

正确的写法应该是这样
private func getCurrentIndex() -> Int {
let point = self.convert(collectionView.center, to: self.collectionView)
let indexPath = self.collectionView.indexPathForItem(at: point)
return indexPath?.item ?? 0
}