---
title: "init(indexSet:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/nsindexset/init(indexset:)"
---

# init(indexSet:)

Initializes an allocated NSIndexSet object with an index set.

## Declaration

```swift
init(indexSet: IndexSet)
```

## Parameters

- `indexSet`: An index set.

## Return Value

Return Value Initialized NSIndexSet object with indexSet.

## Discussion

Discussion This method is a designated initializer for NSIndexSet.

## See Also

### Creating Index Sets

- [init(index:)](foundation/nsindexset/init(index:).md)
- [init(indexesIn:)](foundation/nsindexset/init(indexesin:).md)