//
// ViewController.swift
// iOUSB
//
// Created by Brandon on 2018-05-20.
// Copyright © 2018 XIO. All rights reserved.
//
import UIKit
import Foundation
import ExternalAccessory
class ViewController: UIViewController {
private let tableView = UITableView(frame: .zero, style: .grouped)
private let refreshButton = UIButton(type: .custom)
private var deviceList = [String]()
private var connectedDevice: String = ""
override func viewDidLoad() {
super.viewDidLoad()
title = "Serial Devices"
//Setup UI
setupUI()
//Register for Accessory Notifications
NotificationCenter.default.addObserver(self, selector: #selector(onAccessoryConnected(_:)), name: NSNotification.Name.EAAccessoryDidConnect, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(onAccessoryDisconnected(_:)), name: NSNotification.Name.EAAccessoryDidDisconnect, object: nil)
EAAccessoryManager.shared().registerForLocalNotifications()
//Setup Serial Communications
listDevices()
}
deinit {
//Unregister for Accessory Notifications
EAAccessoryManager.shared().unregisterForLocalNotifications()
NotificationCenter.default.removeObserver(self)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Accessory Notification Callbacks
@objc
private func onAccessoryConnected(_ notification: NSNotification) {
print("Device Connected")
EAAccessoryManager.shared().connectedAccessories.forEach({
print("Manufacturer: \($0.manufacturer)")
print("Name: \($0.name)")
print("Model Number: \($0.modelNumber)")
print("Serial Number: \($0.serialNumber)")
print("Hardware Revision: \($0.hardwareRevision)")
print("Firmware Revision: \($0.firmwareRevision)")
print("Protocol Strings: \($0.protocolStrings)")
})
}
@objc
private func onAccessoryDisconnected(_ notification: NSNotification) {
print("Device Disconnected")
}
}
extension ViewController {
func setupUI() {
view.backgroundColor = .white
let footerView = { () -> UIView in
let view = UIView()
view.backgroundColor = UIColor(white: 0.0, alpha: 0.15)
view.addSubview(refreshButton)
refreshButton.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
refreshButton.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 15.0),
refreshButton.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -15.0),
refreshButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 15.0),
refreshButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -15.0),
refreshButton.heightAnchor.constraint(equalToConstant: 45.0)
])
return view
}()
refreshButton.layer.cornerRadius = 5.0
refreshButton.backgroundColor = .blue
refreshButton.setTitleColor(.white, for: .normal)
refreshButton.setTitle("Reload", for: .normal)
refreshButton.addTarget(self, action: #selector(onReload(_:)), for: .touchUpInside)
view.addSubview(tableView)
view.addSubview(footerView)
tableView.delegate = self
tableView.dataSource = self
if #available(iOS 11.0, *) {
NSLayoutConstraint.activate([
tableView.leftAnchor.constraint(equalTo: view.leftAnchor),
tableView.rightAnchor.constraint(equalTo: view.rightAnchor),
tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
footerView.leftAnchor.constraint(equalTo: view.leftAnchor),
footerView.rightAnchor.constraint(equalTo: view.rightAnchor),
footerView.topAnchor.constraint(equalTo: tableView.bottomAnchor),
footerView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
])
}
else {
NSLayoutConstraint.activate([
tableView.leftAnchor.constraint(equalTo: view.leftAnchor),
tableView.rightAnchor.constraint(equalTo: view.rightAnchor),
tableView.topAnchor.constraint(equalTo: view.topAnchor),
footerView.leftAnchor.constraint(equalTo: view.leftAnchor),
footerView.rightAnchor.constraint(equalTo: view.rightAnchor),
footerView.topAnchor.constraint(equalTo: tableView.bottomAnchor),
footerView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
}
view.subviews.forEach({ $0.translatesAutoresizingMaskIntoConstraints = false })
tableView.register(DeviceCell.self, forCellReuseIdentifier: "DeviceCell")
}
func listDevices() {
let fileManager = FileManager.default
if let pathURL = URL(string: "/dev") {
do {
let fileURLs = try fileManager.contentsOfDirectory(at: pathURL, includingPropertiesForKeys: nil)
deviceList = fileURLs.map({ $0.path }).sorted()
tableView.reloadData()
} catch {
print("Error while enumerating files \(pathURL): \(error.localizedDescription)")
}
}
else {
print("Error opening path: /dev")
}
}
@objc
private func onReload(_ button: UIButton) {
listDevices()
}
}
extension ViewController: UITableViewDelegate, UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return deviceList.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "DeviceCell", for: indexPath) as! DeviceCell
cell.configure(title: deviceList[indexPath.row]) { [weak self] in
if let `self` = self {
if self.deviceList.contains(self.connectedDevice) {
if Serial.shared().disconnect() {
self.connectedDevice = ""
cell.actionButton.setTitle("Connect", for: .normal)
cell.actionButton.backgroundColor = .blue
print("Disconnected!")
}
}
else {
if (Serial.shared().setup(self.deviceList[indexPath.row])) {
self.connectedDevice = self.deviceList[indexPath.row]
cell.actionButton.setTitle("Disconnect", for: .normal)
cell.actionButton.backgroundColor = .green
print("Connected!")
}
else {
let alert = UIAlertController(title: "Error", message: "Error Connecting: \(Serial.shared().lastError() ?? "UnknownError").", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Okay", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
Serial.shared().eraseLastError()
}
}
}
}
if self.deviceList.contains(self.connectedDevice) {
cell.actionButton.setTitle("Disconnect", for: .normal)
cell.actionButton.backgroundColor = .green
}
else {
cell.actionButton.setTitle("Connect", for: .normal)
cell.actionButton.backgroundColor = .blue
}
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 100.0
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return .leastNormalMagnitude
}
func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
return .leastNormalMagnitude
}
}
class DeviceCell: UITableViewCell {
private let titleView = UILabel()
let actionButton = UIButton(type: .custom)
private var eventHandler: (() -> Void)?
func configure(title: String, eventHandler: @escaping () -> Void) {
titleView.text = title
self.eventHandler = eventHandler
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
selectionStyle = .none
actionButton.setTitle("Connect", for: .normal)
actionButton.setTitleColor(.white, for: .normal)
actionButton.contentEdgeInsets = UIEdgeInsets(top: 5.0, left: 15.0, bottom: 5.0, right: 15.0)
actionButton.layer.cornerRadius = 5.0
actionButton.backgroundColor = .blue
contentView.addSubview(titleView)
contentView.addSubview(actionButton)
NSLayoutConstraint.activate([
titleView.leftAnchor.constraint(equalTo: contentView.leftAnchor, constant: 15.0),
titleView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 15.0),
titleView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -15.0),
actionButton.leftAnchor.constraint(greaterThanOrEqualTo: titleView.rightAnchor, constant: 15.0),
actionButton.rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: -15.0),
actionButton.topAnchor.constraint(greaterThanOrEqualTo: contentView.topAnchor, constant: 15.0),
actionButton.bottomAnchor.constraint(lessThanOrEqualTo: contentView.bottomAnchor, constant: -15.0),
actionButton.centerYAnchor.constraint(equalTo: contentView.centerYAnchor)
])
contentView.subviews.forEach({ $0.translatesAutoresizingMaskIntoConstraints = false })
actionButton.addTarget(self, action: #selector(onActionPerformed(_:)), for: .touchUpInside)
}
@objc
private func onActionPerformed(_ button: UIButton) {
self.eventHandler?()
}
@available(*, unavailable)
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
