---
title: QCCompositionRepository
framework: quartz
role: symbol
role_heading: Class
path: quartz/qccompositionrepository
---

# QCCompositionRepository

The QCCompositionRepository class represents a system-wide centralized repository of built-in and installed Quartz Composer compositions (/Library/Compositions and ~/Library/Compositions). The QCCompositionRepository class cannot be subclassed.

## Declaration

```swift
class QCCompositionRepository
```

## Overview

Overview Compositions in the repository are represented by the QCComposition class. You can use the methods of the QCCompositionRepository class to fetch all compositions or only those that meet specific criteria.

## Topics

### Getting the Composition Repository

- [shared()](quartz/qccompositionrepository/shared().md)

### Fetching Compositions

- [composition(withIdentifier:)](quartz/qccompositionrepository/composition(withidentifier:).md)
- [compositions(withProtocols:andAttributes:)](quartz/qccompositionrepository/compositions(withprotocols:andattributes:).md)
- [allCompositions()](quartz/qccompositionrepository/allcompositions().md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Classes

- [QCComposition](quartz/qccomposition.md)
- [QCCompositionLayer](quartz/qccompositionlayer.md)
- [QCCompositionParameterView](quartz/qccompositionparameterview.md)
- [QCCompositionPickerPanel](quartz/qccompositionpickerpanel.md)
- [QCCompositionPickerView](quartz/qccompositionpickerview.md)
- [QCPatchController](quartz/qcpatchcontroller.md)
- [QCPlugIn](quartz/qcplugin.md)
- [QCPlugInViewController](quartz/qcpluginviewcontroller.md)
- [QCRenderer](quartz/qcrenderer.md)
- [QCView](quartz/qcview.md)