如何快速将 Int8 转换为 Uint8？

Question

var ss = UnsafeMutablePointer<Int8>.allocate(capacity: 20)
var b:Data = Data.init(capacity: 20)

for i in 0...19{
    b[i] = UInt8(ss[i])
}

this sentence will not show error utill the ss[i] was bigger than 127.which was a negative number.then it shows an error. says it's not allowed to be a negative number.

how to solve it? I'm a newbie of swift.

Answer 1

var b:Data = Data(bytes:ss,count: 20)