Swift：macのネットワーク上り下りスピードを取得する

• CapabilitiesのIncoming Connections (Server)またはOutgoing Connections (Client)にチェックを入れる

class Network {
    
    private var lastUpBytes: Int?
    private var lastDownBytes: Int?
    
    // interval秒ごとのスピード
    func speed(interval: Int) {
        let process = Process()
        process.launchPath = "/usr/bin/env"
        process.arguments = ["netstat", "-bdI", "en0"]
        
        let pipe = Pipe()
        process.standardOutput = pipe
        process.launch()
        
        let data = pipe.fileHandleForReading.readDataToEndOfFile()
        guard var commandOutput = String(data: data, encoding: .utf8) else {
            return
        }
        commandOutput = commandOutput.lowercased()
        let lines = commandOutput.components(separatedBy: .newlines)
        let stats = lines[1].components(separatedBy: .whitespaces).compactMap({ (str) -> String? in
            return str.isEmpty ? nil : str
        })
        let upBytes = Int(stats[9]) ?? 0
        let downBytes = Int(stats[6]) ?? 0
        var upSpeed: Int = 0
        var downSpeed: Int = 0
        if lastDownBytes != nil && lastUpBytes != nil {
            upSpeed = (upBytes - lastUpBytes!) / interval
            downSpeed = (downBytes - lastDownBytes!) / interval
        }
        lastUpBytes = upBytes
        lastDownBytes = downBytes
        
        Swift.print("Upload: \(convert(byte: Double(upSpeed)))")
        Swift.print("Download: \(convert(byte: Double(downSpeed)))")
    }
    
    private func convert(byte: Double) -> String {
        let KB: Double = 1024
        let MB: Double = pow(KB, 2)
        let GB: Double = pow(KB, 3)
        var str = ""
        if GB <= byte {
            str = String((10 * byte / GB).rounded() / 10) + " GB/s"
        } else if MB <= byte {
            str = String((10 * byte / MB).rounded() / 10) + " MB/s"
        } else {
            str = String((10 * byte / KB).rounded() / 10) + " KB/s"
        }
        return str
    }
    
}

参考

iglance/iGlance