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

For Swift 5 I have created another Data extension that works well.

extension Data {

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

    func toArray(type: T.Type) -> [T] {
        let value = self.withUnsafeBytes {
            $0.baseAddress?.assumingMemoryBound(to: T.self)
        }
        return [T](UnsafeBufferPointer(start: value, count: self.count / MemoryLayout.stride))
    }

}

Sample Usage

let data = Data(fromArray: [1, 2, 3, 4, 5])
let array = data.toArray(type: Int.self)
print(array)
// [1, 2, 3, 4, 5]