NSData from Byte array in Swift

Question

I\'m trying to create an NSData var from an array of bytes.

In Obj-C I might have done this:

NSData *endMarker = [[NSData al

Answer 1

Swift 3 extension

extension Data {

    init(fromArray values: [T]) {
        var values = values
        self.init(buffer: UnsafeBufferPointer(start: &values, count: values.count))
    }

    func toArray(type: T.Type) -> [T] {
        return self.withUnsafeBytes {
            [T](UnsafeBufferPointer(start: $0, count: self.count/MemoryLayout.stride))
        }
    }
}

Usage

let bytes:[UInt8] = [0x00, 0xf4, 0x7c]
let data = Data(fromArray: someBytes)
print(data as NSData)

let bytes = data.toArray(type: UInt8.self)
print(bytes)