Swift 3.0: Value of type 'IndexSet' has no member 'enumerateIndexesUsingBlock'

问题

Receiving Value of type 'IndexSet' has no member 'enumerateIndexesUsingBlock' error at enumerateIndexesUsingBlock.

/**
Extension for creating index paths from an index set
*/
extension IndexSet {
    /**
    - parameter section: The section for the created NSIndexPaths
    - return: An array with NSIndexPaths
    */
    func bs_indexPathsForSection(_ section: Int) -> [IndexPath] {
        var indexPaths: [IndexPath] = []

        self.enumerateIndexesUsingBlock { (index:Int, _) in
            indexPaths.append(IndexPath(item: index, section: section));
        }

        return indexPaths
    }
}

回答1:

The Foundation type NSIndexSet has a enumerateIndexesUsingBlock method. The corresponding overlay type IndexSet from Swift 3 is a collection, therefore you can just map each index to an IndexPath:

extension IndexSet {
    func bs_indexPathsForSection(_ section: Int) -> [IndexPath] {
        return self.map { IndexPath(item: $0, section: section) }
    }
}

来源：https://stackoverflow.com/questions/39638538/swift-3-0-value-of-type-indexset-has-no-member-enumerateindexesusingblock