CoreAudio · IOS API REFERENCE

ManagedAudioChannelLayout.ChannelDescriptions

struct · iOS 13.0+ · SDK 27.1

struct ChannelDescriptions

A collection of `AudioChannelDescription`s.

Members (4)

get · iOS 13.0+

startIndex

TypeScript

get startIndex(): number

Swift declaration

var startIndex: Int { get }

The position of the first element in a nonempty collection. If the collection is empty, `startIndex` is equal to `endIndex`.

get · iOS 13.0+

count

TypeScript

get count(): number

Swift declaration

var count: Int { get }

The number of elements in the collection. To check whether a collection is empty, use its `isEmpty` property instead of comparing `count` to zero. Unless the collection guarantees random-access performance, calculating `count` can be an O(*n*) operation. - Complexity: O(1) if the collection conforms to `RandomAccessCollection`; otherwise, O(*n*), where *n* is the length of the collection.

get · iOS 13.0+

endIndex

TypeScript

get endIndex(): number

Swift declaration

var endIndex: Int { get }

The collection's "past the end" position---that is, the position one greater than the last valid subscript argument. When you need a range that includes the last element of a collection, use the half-open range operator (`..<`) with `endIndex`. The `..<` operator creates a range that doesn't include the upper bound, so it's always safe to use with `endIndex`. For example: let numbers = [10, 20, 30, 40, 50] if let index = numbers.firstIndex(of: 30) { print(numbers[index ..< numbers.endIndex]) } // Prints "[30, 40, 50]" If the collection is empty, `endIndex` is equal to `startIndex`.

subscript · iOS 13.0+

subscript

TypeScript

subscript(index: number): _CoreAudioTypes_AudioChannelDescription

Swift declaration

subscript(index: ManagedAudioChannelLayout.ChannelDescriptions.Index) -> ManagedAudioChannelLayout.ChannelDescriptions.Element { get set }

Accesses the element at the specified position. For example, you can replace an element of an array by using its subscript. var streets = ["Adams", "Bryant", "Channing", "Douglas", "Evarts"] streets[1] = "Butler" print(streets[1]) // Prints "Butler" You can subscript a collection with any valid index other than the collection's end index. The end index refers to the position one past the last element of a collection, so it doesn't correspond with an element. - Parameter position: The position of the element to access. `position` must be a valid index of the collection that is not equal to the `endIndex` property. - Complexity: O(1)

Skipped declarations

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