A snippet showing how to handle receiving a DataStream using Agora's Video SDK (ARSupportBroadcastViewController)

rtcEngine+Snippet.swift

func rtcEngine(_ engine: AgoraRtcEngineKit, receiveStreamMessageFromUid uid: UInt, streamId: Int, data: Data) {
    // successfully received message from user
    guard let dataAsString = String(bytes: data, encoding: String.Encoding.ascii) else { return }

    if debug {
        print("STREAMID: \(streamId)\n - DATA: \(data)\n - STRING: \(dataAsString)\n")
    }

    // check data message
    switch dataAsString {
        case var dataString where dataString.contains("color:"):
            if debug {
                print("color msg recieved\n - \(dataString)")
            }
            // remove the [ ] characters from the string
            if let closeBracketIndex = dataString.firstIndex(of: "]") {
                dataString.remove(at: closeBracketIndex)
                dataString = dataString.replacingOccurrences(of: "color: [", with: "")
            }
             // convert the string into an array -- using , as delimeter
            let colorComponentsStringArray = dataString.components(separatedBy: ", ")
            // safely convert the string values into numbers
            guard let redColor = NumberFormatter().number(from: colorComponentsStringArray[0]) else { return }
            guard let greenColor = NumberFormatter().number(from: colorComponentsStringArray[1]) else { return }
            guard let blueColor = NumberFormatter().number(from: colorComponentsStringArray[2]) else { return }
            guard let colorAlpha = NumberFormatter().number(from: colorComponentsStringArray[3]) else { return }
            // set line color to UIColor from remote user
            self.lineColor = UIColor.init(red: CGFloat(truncating: redColor), green: CGFloat(truncating: greenColor), blue: CGFloat(truncating:blueColor), alpha: CGFloat(truncating:colorAlpha))
        case "undo":
            // TODO: add undo
        case "touch-start":
            // touch-starts
            print("touch-start msg recieved")
            // TODO: handle event
        case "touch-end":
            if debug {
                print("touch-end msg recieved")
            }
        default:
            if debug {
                print("touch points msg recieved")
            }
            // TODO: add points in ARSCN
            
    }
}