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Showing content from https://docs.nativescript.org/guide/ios-runtime-types below:

iOS Runtime Types | NativeScript

NativeScript provides the interop module for working with native C types, pointers, pointer arithmetic and memory.

Using interop Creating a pointer

The Pointer type allows you to represent a void*.

Using the constructor

To create a new pointer with the given offset, use the constructor:

ts

const interop1 = new interop.Pointer(34)

Creating a pointer by adding an offset from an existing pointer ts

const interop2 = interop1.add(4)

Creating a pointer by removing an offset to an existing pointer ts

const interop3 = interop1.subtract(3)

interop API Pointer.toNumber() ts

pointerInstance.toNumber()

Converts the value of a Pointer instance to a number.

adopt ts

interop.adopt(ptr: Pointer): AdoptedPointer

Makes the specified pointer adopted.

free ts

interop.free(ptr: Pointer): void

Releases the memory of the specified unadopted pointer.

sizeof ts

interop.sizeof(type: any): number

Returns the size of the provided type. The type can be: a class constructor (of Objective-C interface), an instance (wrapper of Objective-C interface), struct constructor, struct instance, reference, protocol, function (for c function), fundamental types

alloc ts

interop.alloc(size: number): AdoptedPointer

Allocates memory size in bytes.

handleof ts

interop.handleof(instance: any): Pointer

A JavaScript object can obtain a reference to the underlying native object. The instance can represent a class constructor (for an Objective-C interface), an instance (wrapper of an Objective-C interface), a struct instance, a reference, a protocol, a function (for C functions), or a block.

bufferFromData ts

interop.bufferFromData(data: NSData): ArrayBuffer

Wraps an NSData instance in an ArrayBuffer.

new Reference(value)

Creates a new reference around a JavaScript value. The native representation of the type will be determined during the first time the Reference is used in an operation involving marshalling.

new Reference(type: Type<T>, data: Pointer)

Creates a reference from the pointer with a given type.

new Reference(type: Type<T>, value: any)

Creates a new reference around a value of a certain type.

new FunctionReference(func: T)

Creates a function reference that can be marshalled as a native function pointer. The JavaScript reference must be allocated in memory as long as the native code needs the function.

interop types

"void": Type<void>
bool: Type<boolean>
int8: Type<number>
uint8: Type<number>
int16: Type<number>
uint16: Type<number>
int32: Type<number>
uint32: Type<number>
int64: Type<number>
uint64: Type<number>
float: Type<number>
double: Type<number>
UTF8CString: Type<Reference<number>>
unichar: Type<string>
id: Type<any>
protocol: Type<any>
"class": Type<any>
selector: Type<string>

new StructType()

Create a new instance of the struct.

new StructType (obj: T)

Create a new instance of the struct and initialize it from the fields of the provided object.

equals ts

someStructTypeIntastance.equals(left: T, right: T): boolean

Checks two structs for equality.

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