RealityFoundation · IOS API REFERENCE

IKComponent.ConstraintCollection

struct · iOS 18.0+ · SDK 27.1

struct ConstraintCollection

Ordered dictionary like container with fixed size. Supports subscripting by index, element's identifier or element's name.

Members (11)

get · iOS 18.0+

startIndex

TypeScript

get startIndex(): number

Swift declaration

var startIndex: IKComponent.ConstraintCollection.Index { get }

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

method · iOS 18.0+

makeIterator

TypeScript

makeIterator(): IKComponent_ConstraintCollection_Iterator

Swift declaration

func makeIterator() -> IKComponent.ConstraintCollection.Iterator

Returns an iterator over the elements of the collection.

method · iOS 18.0+

set

TypeScript

set(newValue: IKComponent_Constraint): (IKComponent_Constraint) | null

Swift declaration

@discardableResult mutating func set(_ newValue: IKComponent.ConstraintCollection.Element) -> IKComponent.ConstraintCollection.Element?

Updates the element with identifier matching the new value. - Parameter newValue: The new value to store. - Returns: The previous value if the identifier was found, nil otherwise.

get · iOS 18.0+

count

TypeScript

get count(): number

Swift declaration

var count: Int { get }

The number of elements in the collection.

method · iOS 18.0+

index

TypeScript

index(after: number): number

Swift declaration

func index(after: IKComponent.ConstraintCollection.Index) -> IKComponent.ConstraintCollection.Index

Returns the position immediately after the given index. The successor of an index must be well defined. For an index `i` into a collection `c`, calling `c.index(after: i)` returns the same index every time. - Parameter i: A valid index of the collection. `i` must be less than `endIndex`. - Returns: The index value immediately after `i`.

get · iOS 18.0+

isEmpty

TypeScript

get isEmpty(): boolean

Swift declaration

var isEmpty: Bool { get }

A Boolean value indicating whether the collection is empty.

method · iOS 18.0+

contains

TypeScript

contains(id: IKRig_Constraint_ID): boolean

Swift declaration

func contains(_ id: IKComponent.ConstraintCollection.Element.ID) -> Bool

Returns a Boolean value that indicates whether the collection contains an element with a specific identifier. - Parameter id: The identifier of the element to look up.

get · iOS 18.0+

endIndex

TypeScript

get endIndex(): number

Swift declaration

var endIndex: IKComponent.ConstraintCollection.Index { 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 18.0+

subscript

TypeScript

subscript(id: IKRig_Constraint_ID): (IKComponent_Constraint) | null

Swift declaration

subscript(id: IKComponent.ConstraintCollection.Element.ID) -> IKComponent.ConstraintCollection.Element? { get set }

Accesses the element with the specified identifier. The following set scenarios are ignored: * Setting nil * Setting element with different id, e.g. `collection[ID(2)]?.id = ID(3) * Setting element with id not in the set - Parameter id: The identifier of the requested element.

subscript · iOS 18.0+

subscript

TypeScript

subscript41475(name: string): (IKComponent_Constraint) | null

Swift declaration

subscript(name: String) -> IKComponent.ConstraintCollection.Element? { get set }

Accesses the element with the specified name. Has the same setter restrictions as ``IKComponent/ConstraintCollection/subscript(id:)`` - Parameter name: The name of the requested element.

subscript · iOS 18.0+

subscript

TypeScript

subscript65015(position: number): IKComponent_Constraint

Swift declaration

subscript(position: IKComponent.ConstraintCollection.Index) -> IKComponent.ConstraintCollection.Element { get set }

Accesses the element at the specified position. The following example accesses an element of an array through its subscript to print its value: var streets = ["Adams", "Bryant", "Channing", "Douglas", "Evarts"] print(streets[1]) // Prints "Bryant" 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)

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