SecondViewController.swift

//
//  ViewController.swift
//  Warning
//
//  Created by 이주송 on 2022/09/19.
//

import UIKit
import WebKit

class SecondViewController: UIViewController,WKUIDelegate,WKNavigationDelegate {

    @IBOutlet weak var webView: WKWebView!
    
    lazy var leftButton: UIBarButtonItem = {
        let button = UIBarButtonItem(image: UIImage(systemName: "chevron.left"), style: .plain, target: self, action: #selector(backButtonPressed(_:)))
        button.tag = 1
        return button
    }()
    
    lazy var rightButton: UIBarButtonItem = {
        let button = UIBarButtonItem(image: UIImage(systemName: "chair"), style: .plain, target: self, action: #selector(buttonPressed(_:)))
        button.tag = 2
        return button
    }()
    
    @objc private func buttonPressed(_ sender: Any) {
        if let button = sender as? UIBarButtonItem {
            switch button.tag {
            case 1:
                print("뒤로가기")
            case 2:
                print("예약버튼 클릭")
            default:
                print("error")
            }
        }
    }
    
    @objc private func backButtonPressed(_ sender: Any) {
        self.navigationController?.popViewController(animated: true)
    }
    
    override func viewWillAppear(_ animated: Bool) {
        self.navigationItem.rightBarButtonItem = self.rightButton
        self.navigationItem.leftBarButtonItem = self.leftButton
    }
    
    override func loadView() {
               super.loadView()
               
               webView = WKWebView(frame: self.view.frame)
               webView.uiDelegate = self
               webView.navigationDelegate = self
               self.view = self.webView
           }

       override func viewDidLoad() {
           super.viewDidLoad()
          
           let url = URL(string: "http://mobileid.kw.ac.kr/seatweb/roomview5.asp?room_no=2")
           let request = URLRequest(url: url!)
           //self.webView?.allowsBackForwardNavigationGestures = true  //뒤로가기 제스쳐 허용
           webView.configuration.preferences.javaScriptEnabled = true  //자바스크립트 활성화
           webView.load(request)

       }
       
       override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } //모달창 닫힐때 앱 종료현상 방지.
       
       //alert 처리
       func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
                    initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void){
           let alertController = UIAlertController(title: "", message: message, preferredStyle: .alert)
           alertController.addAction(UIAlertAction(title: "확인", style: .default, handler: { (action) in completionHandler() }))
           self.present(alertController, animated: true, completion: nil) }

       //confirm 처리
       func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (Bool) -> Void) {
           let alertController = UIAlertController(title: "", message: message, preferredStyle: .alert)
           alertController.addAction(UIAlertAction(title: "취소", style: .default, handler: { (action) in completionHandler(false) }))
           alertController.addAction(UIAlertAction(title: "확인", style: .default, handler: { (action) in completionHandler(true) }))
           self.present(alertController, animated: true, completion: nil) }
       
       // href="_blank" 처리
       func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
           if navigationAction.targetFrame == nil { webView.load(navigationAction.request) }
           return nil }
}