How in swift to convert Int16 to two UInt8 Bytes

Question

I have some binary data that encodes a two byte value as a signed integer.

bytes[1] = 255  // 0xFF
bytes[2] = 251  // 0xF1

Decoding

Answer 1

You could use init(truncatingBitPattern: Int16) initializer:

let nv: Int16 = -15
UInt8(truncatingBitPattern: nv >> 8) // -> 255
UInt8(truncatingBitPattern: nv) // -> 241