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# Core Text Data Types

## Topics

### Data Types

[`typealias ATSFontRef`](/documentation/CoreText/ATSFontRef)

[`typealias CTFontCollectionSortDescriptorsCallback`](/documentation/CoreText/CTFontCollectionSortDescriptorsCallback)

The collection sorting callback type.

[`typealias CTFontDescriptorProgressHandler`](/documentation/CoreText/CTFontDescriptorProgressHandler)

The progress callback type.


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