class · iOS 17.0+ · SDK 27.1
class CMTagCMTag is used to label something about a resource or other media construct. A CMTag contains a category and a value to represent a particular tag that might be assigned to or associated with another resource. There is only one of each of the category and the value so any notion of "has" is about the respective singular element. CMTags carry a single value that can be carried in 64 bits. This can include data types such as signed 64-bit integers, floating point values fitting in 64 bits, up to 64 bit of flags, and other data types fitting within 64 bits. A CMTag value should not be used to carry pointers or objects. If such a reference is needed, it is okay to carry an index into an out-of-band data structure that itself has a memory reference or an object reference.
static stereoView(value: CMStereoViewComponents): CMTypedTag<CMStereoViewComponents>static func stereoView(_ value: CMStereoViewComponents) -> CMTypedTag<CMStereoViewComponents>Initializes a CMTag instance for a stereoView tag with the specified value. - Parameters: - value: The value for the tag.
get description(): stringvar description: String { get }A textual representation of this instance. Calling this property directly is discouraged. Instead, convert an instance of any type to a string by using the `String(describing:)` initializer. This initializer works with any type, and uses the custom `description` property for types that conform to `CustomStringConvertible`: struct Point: CustomStringConvertible { let x: Int, y: Int var description: String { return "(\(x), \(y))" } } let p = Point(x: 21, y: 30) let s = String(describing: p) print(s) // Prints "(21, 30)" The conversion of `p` to a string in the assignment to `s` uses the `Point` type's `description` property.
static packingType(value: CMPackingType): CMTypedTag<CMPackingType>static func packingType(_ value: CMPackingType) -> CMTypedTag<CMPackingType>Initializes a CMTag instance for a packingType tag with the specified value. - Parameters: - value: The value for the tag.
static pixelFormat(value: SDKHandle): CMTypedTag<SDKHandle>static func pixelFormat(_ value: OSType) -> CMTypedTag<OSType>Initializes a CMTag instance for a pixelFormat tag with the specified value. - Parameters: - value: The value for the tag.
static init(rawCategory: SDKHandle, rawTagValue: CMTag_Value): CMTaginit(rawCategory: CMTag.RawCategory, rawTagValue: CMTag.Value)Initializes a CMTag instance with the specified category and value. - Parameters: - category: The category to use for the CMTag. - rawTagValue: The value to use for the CMTag.
get rawCategory(): SDKHandlefinal let rawCategory: CMTag.RawCategoryThe category for the tag.
get rawTagValue(): CMTag_Valuefinal let rawTagValue: CMTag.ValueThe value for the tag.
static mediaSubType(value: CMFormatDescription_MediaSubType): CMTypedTag<CMFormatDescription_MediaSubType>static func mediaSubType(_ value: CMFormatDescription.MediaSubType) -> CMTypedTag<CMFormatDescription.MediaSubType>Initializes a CMTag instance for a mediaSubType tag with the specified value. - Parameters: - value: The value for the tag.
static videoLayerID(value: number): CMTypedTag<number>static func videoLayerID(_ value: Int64) -> CMTypedTag<Int64>Initializes a CMTag instance for a videoLayerID tag with the specified value. - Parameters: - value: The value for the tag.
static projectionType(value: CMProjectionType): CMTypedTag<CMProjectionType>static func projectionType(_ value: CMProjectionType) -> CMTypedTag<CMProjectionType>Initializes a CMTag instance for a projectionType tag with the specified value. - Parameters: - value: The value for the tag.
static stereoViewInterpretation(value: CMStereoViewInterpretationOptions): CMTypedTag<CMStereoViewInterpretationOptions>static func stereoViewInterpretation(_ value: CMStereoViewInterpretationOptions) -> CMTypedTag<CMStereoViewInterpretationOptions>Initializes a CMTag instance for a stereoViewInterpretation tag with the specified value. - Parameters: - value: The value for the tag.
value(category: CMTypedTag_Category<number>): (number) | nullfunc value<T>(onlyIfMatching category: CMTypedTag<T>.Category) -> T? where T : SendableReturns the strongly typed value for a tag if it matches the specified category. Returns nil if the category of the tag doesn't match the specified category. - Parameters: - category: The category to match.
static trackID(value: number): CMTypedTag<number>static func trackID(_ value: CMPersistentTrackID) -> CMTypedTag<CMPersistentTrackID>Initializes a CMTag instance for a trackID tag with the specified value. - Parameters: - value: The value for the tag.
static channelID(value: number): CMTypedTag<number>static func channelID(_ value: Int64) -> CMTypedTag<Int64>Initializes a CMTag instance for a channelID tag with the specified value. - Parameters: - value: The value for the tag.
static mediaType(value: CMFormatDescription_MediaType): CMTypedTag<CMFormatDescription_MediaType>static func mediaType(_ value: CMFormatDescription.MediaType) -> CMTypedTag<CMFormatDescription.MediaType>Initializes a CMTag instance for a mediaType tag with the specified value. - Parameters: - value: The value for the tag.
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