---
title: Core Foundation Constants
framework: corefoundation
role: collectionGroup
role_heading: API Collection
path: corefoundation/core-foundation-constants
---

# Core Foundation Constants

## Topics

### Constants

- [CFByteOrderBigEndian](corefoundation/cfbyteorderbigendian.md)
- [CFByteOrderLittleEndian](corefoundation/cfbyteorderlittleendian.md)
- [CFByteOrderUnknown](corefoundation/cfbyteorderunknown.md)
- [kCFCoreFoundationVersionNumber10_10](corefoundation/kcfcorefoundationversionnumber10_10.md)
- [kCFCoreFoundationVersionNumber10_10_1](corefoundation/kcfcorefoundationversionnumber10_10_1.md)
- [kCFCoreFoundationVersionNumber10_10_2](corefoundation/kcfcorefoundationversionnumber10_10_2.md)
- [kCFCoreFoundationVersionNumber10_10_3](corefoundation/kcfcorefoundationversionnumber10_10_3.md)
- [kCFCoreFoundationVersionNumber10_10_4](corefoundation/kcfcorefoundationversionnumber10_10_4.md)
- [kCFCoreFoundationVersionNumber10_10_5](corefoundation/kcfcorefoundationversionnumber10_10_5.md)
- [kCFCoreFoundationVersionNumber10_10_Max](corefoundation/kcfcorefoundationversionnumber10_10_max.md)
- [kCFCoreFoundationVersionNumber10_11](corefoundation/kcfcorefoundationversionnumber10_11.md)
- [kCFCoreFoundationVersionNumber10_11_1](corefoundation/kcfcorefoundationversionnumber10_11_1.md)
- [kCFCoreFoundationVersionNumber10_11_2](corefoundation/kcfcorefoundationversionnumber10_11_2.md)
- [kCFCoreFoundationVersionNumber10_11_3](corefoundation/kcfcorefoundationversionnumber10_11_3.md)
- [kCFCoreFoundationVersionNumber10_11_4](corefoundation/kcfcorefoundationversionnumber10_11_4.md)
- [kCFCoreFoundationVersionNumber10_11_Max](corefoundation/kcfcorefoundationversionnumber10_11_max.md)
- [kCFCoreFoundationVersionNumber10_7_5](corefoundation/kcfcorefoundationversionnumber10_7_5.md)
- [kCFCoreFoundationVersionNumber10_8](corefoundation/kcfcorefoundationversionnumber10_8.md)
- [kCFCoreFoundationVersionNumber10_8_1](corefoundation/kcfcorefoundationversionnumber10_8_1.md)
- [kCFCoreFoundationVersionNumber10_8_2](corefoundation/kcfcorefoundationversionnumber10_8_2.md)
- [kCFCoreFoundationVersionNumber10_8_3](corefoundation/kcfcorefoundationversionnumber10_8_3.md)
- [kCFCoreFoundationVersionNumber10_8_4](corefoundation/kcfcorefoundationversionnumber10_8_4.md)
- [kCFCoreFoundationVersionNumber10_9](corefoundation/kcfcorefoundationversionnumber10_9.md)
- [kCFCoreFoundationVersionNumber10_9_1](corefoundation/kcfcorefoundationversionnumber10_9_1.md)
- [kCFCoreFoundationVersionNumber10_9_2](corefoundation/kcfcorefoundationversionnumber10_9_2.md)
- [kCFCoreFoundationVersionNumber_iOS_6_0](corefoundation/kcfcorefoundationversionnumber_ios_6_0.md)
- [kCFCoreFoundationVersionNumber_iOS_6_1](corefoundation/kcfcorefoundationversionnumber_ios_6_1.md)
- [kCFCoreFoundationVersionNumber_iOS_7_0](corefoundation/kcfcorefoundationversionnumber_ios_7_0.md)
- [kCFCoreFoundationVersionNumber_iOS_7_1](corefoundation/kcfcorefoundationversionnumber_ios_7_1.md)
- [kCFCoreFoundationVersionNumber_iOS_8_0](corefoundation/kcfcorefoundationversionnumber_ios_8_0.md)
- [kCFCoreFoundationVersionNumber_iOS_8_1](corefoundation/kcfcorefoundationversionnumber_ios_8_1.md)
- [kCFCoreFoundationVersionNumber_iOS_8_2](corefoundation/kcfcorefoundationversionnumber_ios_8_2.md)
- [kCFCoreFoundationVersionNumber_iOS_8_3](corefoundation/kcfcorefoundationversionnumber_ios_8_3.md)
- [kCFCoreFoundationVersionNumber_iOS_8_4](corefoundation/kcfcorefoundationversionnumber_ios_8_4.md)
- [kCFCoreFoundationVersionNumber_iOS_8_x_Max](corefoundation/kcfcorefoundationversionnumber_ios_8_x_max.md)
- [kCFCoreFoundationVersionNumber_iOS_9_0](corefoundation/kcfcorefoundationversionnumber_ios_9_0.md)
- [kCFCoreFoundationVersionNumber_iOS_9_1](corefoundation/kcfcorefoundationversionnumber_ios_9_1.md)
- [kCFCoreFoundationVersionNumber_iOS_9_2](corefoundation/kcfcorefoundationversionnumber_ios_9_2.md)
- [kCFCoreFoundationVersionNumber_iOS_9_3](corefoundation/kcfcorefoundationversionnumber_ios_9_3.md)
- [kCFCoreFoundationVersionNumber_iOS_9_4](corefoundation/kcfcorefoundationversionnumber_ios_9_4.md)
- [kCFCoreFoundationVersionNumber_iOS_9_x_Max](corefoundation/kcfcorefoundationversionnumber_ios_9_x_max.md)
- [kCFNotFound](corefoundation/kcfnotfound.md)
- [kCFURLAddedToDirectoryDateKey](corefoundation/kcfurladdedtodirectorydatekey.md)
- [kCFURLApplicationIsScriptableKey](corefoundation/kcfurlapplicationisscriptablekey.md)
- [kCFURLCanonicalPathKey](corefoundation/kcfurlcanonicalpathkey.md)
- [kCFURLDocumentIdentifierKey](corefoundation/kcfurldocumentidentifierkey.md)
- [kCFURLFileProtectionComplete](corefoundation/kcfurlfileprotectioncomplete.md)
- [kCFURLFileProtectionCompleteUnlessOpen](corefoundation/kcfurlfileprotectioncompleteunlessopen.md)
- [kCFURLFileProtectionCompleteUntilFirstUserAuthentication](corefoundation/kcfurlfileprotectioncompleteuntilfirstuserauthentication.md)
- [kCFURLFileProtectionKey](corefoundation/kcfurlfileprotectionkey.md)
- [kCFURLFileProtectionNone](corefoundation/kcfurlfileprotectionnone.md)
- [kCFURLGenerationIdentifierKey](corefoundation/kcfurlgenerationidentifierkey.md)
- [kCFURLIsApplicationKey](corefoundation/kcfurlisapplicationkey.md)
- [kCFURLQuarantinePropertiesKey](corefoundation/kcfurlquarantinepropertieskey.md)
- [kCFURLTagNamesKey](corefoundation/kcfurltagnameskey.md)
- [kCFURLUbiquitousItemDownloadingErrorKey](corefoundation/kcfurlubiquitousitemdownloadingerrorkey.md)
- [kCFURLUbiquitousItemDownloadingStatusCurrent](corefoundation/kcfurlubiquitousitemdownloadingstatuscurrent.md)
- [kCFURLUbiquitousItemDownloadingStatusDownloaded](corefoundation/kcfurlubiquitousitemdownloadingstatusdownloaded.md)
- [kCFURLUbiquitousItemDownloadingStatusKey](corefoundation/kcfurlubiquitousitemdownloadingstatuskey.md)
- [kCFURLUbiquitousItemDownloadingStatusNotDownloaded](corefoundation/kcfurlubiquitousitemdownloadingstatusnotdownloaded.md)
- [kCFURLUbiquitousItemUploadingErrorKey](corefoundation/kcfurlubiquitousitemuploadingerrorkey.md)
- [kCFURLVolumeIsEncryptedKey](corefoundation/kcfurlvolumeisencryptedkey.md)
- [kCFURLVolumeIsRootFileSystemKey](corefoundation/kcfurlvolumeisrootfilesystemkey.md)
- [kCFURLVolumeSupportsCompressionKey](corefoundation/kcfurlvolumesupportscompressionkey.md)
- [kCFURLVolumeSupportsExclusiveRenamingKey](corefoundation/kcfurlvolumesupportsexclusiverenamingkey.md)
- [kCFURLVolumeSupportsFileCloningKey](corefoundation/kcfurlvolumesupportsfilecloningkey.md)
- [kCFURLVolumeSupportsSwapRenamingKey](corefoundation/kcfurlvolumesupportsswaprenamingkey.md)
- [CGFLOAT_EPSILON](corefoundation/cgfloat_epsilon.md)
- [CGFLOAT_IS_DOUBLE](corefoundation/cgfloat_is_double.md)
- [CGFLOAT_MAX](corefoundation/cgfloat_max.md)
- [CGFLOAT_MIN](corefoundation/cgfloat_min.md)
- [COREFOUNDATION_CFPLUGINCOM_SEPARATE](corefoundation/corefoundation_cfplugincom_separate.md)
- [ISA_PTRAUTH_DISCRIMINATOR](corefoundation/isa_ptrauth_discriminator.md)
- [kCFErrorLocalizedFailureKey](corefoundation/kcferrorlocalizedfailurekey.md)
- [kCFURLDirectoryEntryCountKey](corefoundation/kcfurldirectoryentrycountkey.md)
- [kCFURLFileContentIdentifierKey](corefoundation/kcfurlfilecontentidentifierkey.md)
- [kCFURLFileIdentifierKey](corefoundation/kcfurlfileidentifierkey.md)
- [kCFURLFileProtectionCompleteWhenUserInactive](corefoundation/kcfurlfileprotectioncompletewhenuserinactive.md)
- [kCFURLIsPurgeableKey](corefoundation/kcfurlispurgeablekey.md)
- [kCFURLIsSparseKey](corefoundation/kcfurlissparsekey.md)
- [kCFURLMayHaveExtendedAttributesKey](corefoundation/kcfurlmayhaveextendedattributeskey.md)
- [kCFURLMayShareFileContentKey](corefoundation/kcfurlmaysharefilecontentkey.md)
- [kCFURLUbiquitousItemIsExcludedFromSyncKey](corefoundation/kcfurlubiquitousitemisexcludedfromsynckey.md)
- [kCFURLVolumeAvailableCapacityForImportantUsageKey](corefoundation/kcfurlvolumeavailablecapacityforimportantusagekey.md)
- [kCFURLVolumeAvailableCapacityForOpportunisticUsageKey](corefoundation/kcfurlvolumeavailablecapacityforopportunisticusagekey.md)
- [kCFURLVolumeMountFromLocationKey](corefoundation/kcfurlvolumemountfromlocationkey.md)
- [kCFURLVolumeSubtypeKey](corefoundation/kcfurlvolumesubtypekey.md)
- [kCFURLVolumeSupportsAccessPermissionsKey](corefoundation/kcfurlvolumesupportsaccesspermissionskey.md)
- [kCFURLVolumeSupportsFileProtectionKey](corefoundation/kcfurlvolumesupportsfileprotectionkey.md)
- [kCFURLVolumeSupportsImmutableFilesKey](corefoundation/kcfurlvolumesupportsimmutablefileskey.md)
- [kCFURLVolumeTypeNameKey](corefoundation/kcfurlvolumetypenamekey.md)
- [kCFUserNotificationAlertTopMostKey](corefoundation/kcfusernotificationalerttopmostkey.md)
- [kCFUserNotificationKeyboardTypesKey](corefoundation/kcfusernotificationkeyboardtypeskey.md)

## See Also

### Reference

- [CFStream](corefoundation/cfstream.md)
- [Core Foundation Structures](corefoundation/core-foundation-structures.md)
- [Core Foundation Enumerations](corefoundation/core-foundation-enumerations.md)
- [Core Foundation Functions](corefoundation/core-foundation-functions.md)
- [Core Foundation Data Types](corefoundation/core-foundation-data-types.md)
- [Core Foundation Macros](corefoundation/corefoundation-macros.md)