Convert Byte Array to Data and to Int

This is about converting Data into Integer in Swift.

Swift Code

let data = Data(buffer: UnsafeBufferPointer(start: &byteArray, count: xDataArray.count))
var val: Int32 = xData.withUnsafeBytes { $0.pointee }
val = Int32(bigEndian: xVal)

There’s couple things we need to notice.

First Int is a 64-bit integer on 64-bit platforms, and if the input data has only 32-bit, we need to use Int32.

Second the swift Int uses little-endian representation on all current Swift platform. If the input is big-endian, we need to use Int32(bigEndian: xx)

More to Read

I use Data object to convert byteArray and Int32. For more about converting between values with Data objects, take a look at this stackoverflow answer.