segment

segmentURL.swift

//
//  ViewController.swift
//  testWeb
//
//  Created by LEE HAEUN on 2019/07/18.
//  Copyright © 2019 LEE HAEUN. All rights reserved.
//

import UIKit
import WebKit

class ViewController: UIViewController {

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    initView()
    setupWebViewGesture()
  }
  func initView(){
    view.addSubview(myWebView)
    view.addSubview(segment)
    NSLayoutConstraint.activate([
      myWebView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
      myWebView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
      myWebView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
      myWebView.bottomAnchor.constraint(equalTo: segment.topAnchor),
      
      segment.leadingAnchor.constraint(equalTo: view.leadingAnchor),
      segment.trailingAnchor.constraint(equalTo: view.trailingAnchor),
      segment.heightAnchor.constraint(equalToConstant: 60),
      segment.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
      ])
  }

  let segArr = ["facebook","twitter","apple","google"]
  let urlArr = [
    URL(string: "https://www.facebook.com/"),
    URL(string: "https://www.twitter.com/"),
    URL(string: "https://www.apple.com/"),
    URL(string: "https://www.google.com/")
  ]
  lazy var myWebView : WKWebView = {
    let view = WKWebView()
    //view.allowsBackForwardNavigationGestures = true
    view.translatesAutoresizingMaskIntoConstraints = false
    return view
  }()

  lazy var segment: UISegmentedControl = {
    let segment = UISegmentedControl(items: segArr)
    segment.translatesAutoresizingMaskIntoConstraints = false
    segment.addTarget(self, action: #selector(segmentEvent), for: .valueChanged)
    return segment
  }()

}
extension ViewController {
  func setupWebViewGesture(){
    let swipeLeftRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(recognizer:)))
    let swipeRightRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipe(recognizer:)))
    swipeLeftRecognizer.direction = .left
    swipeRightRecognizer.direction = .right
    myWebView.addGestureRecognizer(swipeLeftRecognizer)
    myWebView.addGestureRecognizer(swipeRightRecognizer)
  }
  ///segment
  @objc func segmentEvent(){
    let url: URL?
    url = urlArr[segment.selectedSegmentIndex]
    // url 이 nil 이면 return
    guard let checkURL = url else{
      return
    }
    let requset: URLRequest = URLRequest(url: checkURL)
    myWebView.stopLoading()
    myWebView.load(requset)
  }
  //제스쳐
  @objc private func handleSwipe(recognizer: UISwipeGestureRecognizer) {
    if (recognizer.direction == .left) {
      if myWebView.canGoForward {
        myWebView.goForward()
        if let url = myWebView.url?.absoluteURL {
          checkURL(url: url)
        }
      }
    }
    
    if (recognizer.direction == .right) {
      if myWebView.canGoBack {
        myWebView.goBack()
        if let url = myWebView.url?.absoluteURL {
          checkURL(url: url)
        }
      }
    }
  }
}
extension ViewController {
  func checkURL(url: URL){
    let index = urlArr.firstIndex(of: url)
    //index 가 nil 이면 index = 0
    segment.selectedSegmentIndex = index ?? 0
  }
}
//