[Swift] Save UInt8 array as a file

README.md

Save UInt8 array as a file

$ swift write1.swift
$ xxd /path/to/file
00000000: 1234 5678                                .4Vx

The write1.swift is a most easy way. You can also implement your own write() method like the write2.swift.

write1.swift

import Foundation

let a: [UInt8] = [0x12, 0x34, 0x56, 0x78]
let d = Data(a)

do {
    try d.write(to: URL(string: "file:///path/to/file")!)
} catch {
    print("Oops!")
}

write2.swift

import Foundation

extension Array where Element == UInt8 {
    func write(_ path: String) -> Int {
        if !FileManager.default.createFile(atPath: path, contents: nil, attributes: nil) {
            return -1
        }
        guard let fh = FileHandle(forWritingAtPath: path) else {
            return -2
        }

        fh.seekToEndOfFile()
        fh.write(Data(self))
        fh.closeFile()

        return self.count
    }
}

let a: [UInt8] = [0x12, 0x34, 0x56, 0x78]

if a.write("/path/to/file") < 0 {
    print("oops!")
}