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# CTFontManagerUnregisterFontDescriptors(_:_:_:)

Unregisters font descriptors with the font manager.

```
func CTFontManagerUnregisterFontDescriptors(_ fontDescriptors: CFArray, _ scope: CTFontManagerScope, _ registrationHandler: ((CFArray, Bool) -> Bool)?)
```

## Parameters

`fontDescriptors`

An array of font descriptors to unregister.

`scope`

A scope constant that defines the availability and lifetime of the registration. See [`CTFontManagerScope`](/documentation/CoreText/CTFontManagerScope) for more details.

`registrationHandler`

A block called as errors arise or upon completion.

    The block’s     `errors`     parameter contains an array of     <doc://com.apple.documentation/documentation/CoreFoundation/CFError>     references; an empty array indicates no errors unregistering the font descriptors. Each error reference contains a     <doc://com.apple.documentation/documentation/CoreFoundation/CFArray>     of font descriptors corresponding to [`kCTFontManagerErrorFontDescriptorsKey`](/documentation/CoreText/kCTFontManagerErrorFontDescriptorsKey)    . These represent the font descriptors causing the error and failing to unregister successfully.

    This block may be called multiple times during the unregistration process. The     `done`     parameter becomes     <doc://com.apple.documentation/documentation/Swift/true>     when the unregistration process completes. Return     <doc://com.apple.documentation/documentation/Swift/false>     from the block to stop the unregistration operation, like after receiving an error.

## Discussion

Unregistered fonts don’t participate in font descriptor matching.

---

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