---
title: "init(deltas:mappingData:)"
framework: Core Text
role: symbol
role_heading: Initializer
path: "coretext/bslnformat1part/init(deltas:mappingdata:)"
---

# init(deltas:mappingData:)

## Declaration

```swift
init(deltas: (Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16, Int16), mappingData: SFNTLookupTable)
```