無法推斷出通用參數S

Question

無法推斷出通用參數S.

var buff:[Int8] = [Int8](repeating:0,count:16) 
... 
var addr = String(bytes: buff, encoding: String.Encoding.utf8) 

How it seems in xCode

Answer 1

根據the documentation，buff需要爲類型S其中S : Sequence, S.Iterator.Element == UInt8的。所以你需要它是一組UInt8's而不是Int8的

import Foundation 

var buff:[UInt8] = [UInt8](repeating:0,count:16) 
var addr = String(bytes: buff, encoding: .utf8)