A quick and simple way to convert int to uint8.

int-to-uint8-rudimentary.go

package main

import (
    "fmt"
)

func main() {
    var x int = 217
    var y uint8
    for i := 0; i < x; i++ {
        if i == 255 {
            // Handle overflow as desired.
            fmt.Println("Too big.")
            break
        }
        y++
    }
    fmt.Println(y)
}