swift 3 ios : convert UInt8 Array to int8

Question

i have an UInt8 array that contains values between 0 and 255

i would like to convert this array to Int8 array in order to contains values between -128 and 127

How to achieve this in swift?

Answer 1

使用map和适当的初始化程序：

let intArray = uintArray.map { Int8(bitPattern: $0) }

Answer 2

You can convert a [UInt8] to a [Int8] by using this:

for el in uint8Array {
    uint8Array.append(UInt8(bitPattern: el))
}