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# CTFontCreateForString(_:_:_:)

Returns a font reference that most accurately maps the string range based on the current font.

```
func CTFontCreateForString(_ currentFont: CTFont, _ string: CFString, _ range: CFRange) -> CTFont
```

## Parameters

`currentFont`

The current font that contains a valid cascade list.

`string`

A Unicode string containing characters that can’t be encoded by the current font.

`range`

A <doc://com.apple.documentation/documentation/CoreFoundation/CFRange> structure specifying the range of the string to map.

## Return Value

The best substitute font from the cascade list of the current font that can encode the specified string range.

## Discussion

If the current font can encode the string range, the function retains and returns the font.

## See Also

[`CTFontCopyCharacterSet`](/documentation/CoreText/CTFontCopyCharacterSet(_:))

Returns the Unicode character set of the font.

[`CTFontGetGlyphsForCharacters`](/documentation/CoreText/CTFontGetGlyphsForCharacters(_:_:_:_:))

Performs basic character-to-glyph mapping.

[`kCTFontCascadeListAttribute`](/documentation/CoreText/kCTFontCascadeListAttribute)

The cascade list used for a font reference.


---

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