yingmeng-ios-switf/yinmeng-ios/Base/Web/WebViewController.swift

//
//  WebViewController.swift
//  yinmeng-ios
//
//  Created by yinmeng on 2024/2/26.
//

import UIKit
import WebKit
class WebViewWeakScriptMessage: NSObject, WKScriptMessageHandler {

	private(set) weak var target: WKScriptMessageHandler?

	required init(target: WKScriptMessageHandler?) {
		self.target = target
	}


	func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
		target?.userContentController(userContentController, didReceive: message)
	}

}

class WebViewController: BaseViewController {

	typealias OnReceiveMessage = (_ msg: WKScriptMessage) -> Void

	private(set) lazy var webview = makeWebView()

	private(set) var progressView = UIProgressView()

	private lazy var userContentController = WKUserContentController()

	private var callbacks: [String: [OnReceiveMessage]] = [:]

	private(set) weak var navigationDelegate: WKNavigationDelegate?

	private(set) var url: String?
    var isHalf:Bool = false
	convenience init(
		url: String?,
        navigationDelegate: WKNavigationDelegate? = nil,isHalf:Bool = false
	) {
		self.init(nibName: nil, bundle: nil)
		self.url = url
        self.isHalf = isHalf
		if var url = url {
			if !url.hasPrefix("http") {
				url =  "\(H5_URL)/\(url)"
			}
			self.url = url
		}
		self.navigationDelegate = navigationDelegate
	}

	override func viewDidLoad() {
		super.viewDidLoad()
		loadSubViews()
		loadWebView()
	}

	override func viewWillAppear(_ animated: Bool) {
		super.viewWillAppear(animated)
		addObserve()
	}

	override func viewWillDisappear(_ animated: Bool) {
		super.viewWillDisappear(animated)
		removeObserve()
	}

	override func viewDidLayoutSubviews() {
		super.viewDidLayoutSubviews()

		view.bringSubviewToFront(progressView)
	}

	private func loadSubViews() {
		
        if self.isHalf{
            let bakcBtn = UIButton()
            bakcBtn.addTarget(self, action: #selector(dissViewAction), for: .touchUpInside)
            view.addSubview(bakcBtn)
            bakcBtn.snp.makeConstraints { make in
                make.edges.equalTo(view)
            }
            view.addSubview(webview)
            view.addSubview(progressView)
            progressView.snp.makeConstraints { make in
                make.top.equalTo(view).offset(0)
                make.left.right.equalTo(view).offset(0)
                make.height.equalTo(1)
            }
            view.backgroundColor = .clear
            webview.snp.makeConstraints { make in
                
                make.left.bottom.right.equalTo(view)
                make.height.equalTo(ScreenHeight * 0.65)
            }
        }else{
            view.addSubview(webview)
            view.addSubview(progressView)
            progressView.snp.makeConstraints { make in
                make.top.equalTo(view).offset(0)
                make.left.right.equalTo(view).offset(0)
                make.height.equalTo(1)
            }
            webview.snp.makeConstraints { make in
                make.top.equalTo(view).offset(1)
                make.left.right.bottom.equalTo(view)
            }
        }
        
		
		progressView.trackTintColor = .clear
		progressView.transform = .init(scaleX: 1, y: 1.5)
		progressView.alpha = 0
	}
    
    @objc func dissViewAction(){
        self.dismiss(animated: true)
    }
    
	override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
		if let object = object as? WKWebView, object == webview {
			if keyPath == "estimatedProgress" {
				progressView.setProgress(Float(webview.estimatedProgress), animated: true)
				return
			}
		}

		if keyPath == "title" {
			title = webview.title
			return
		}
	}

	func addObserve() {
		//添加KVO，WKWebView有一个属性estimatedProgress，就是当前网页加载的进度，所以监听这个属性
		webview.addObserver(self, forKeyPath: "estimatedProgress", context: nil)
		//添加KVO，监听title属性
		webview.addObserver(self, forKeyPath: "title", context: nil)
	}

	func removeObserve() {
		webview.removeObserver(self, forKeyPath: "estimatedProgress")
		webview.removeObserver(self, forKeyPath: "title")
	}

	func loadWebView() {
		guard let url = url,
			let theUrl = URL(string: url),
			  let _ = theUrl.scheme,
			  let _ = theUrl.host else {
			return
		}

		webview.load(URLRequest(url: theUrl))
	}

	func reloadWebViewWithUrl(_ url: String) {
		self.url = url
		loadWebView()
	}

	func makeWebView() -> WKWebView {
		let configuration = WKWebViewConfiguration()
		configuration.mediaTypesRequiringUserActionForPlayback = .all
		configuration.allowsInlineMediaPlayback = true
		configuration.allowsPictureInPictureMediaPlayback = true
		configuration.selectionGranularity = .character
		configuration.userContentController = userContentController

		let preferences = WKPreferences()
		if #available(iOS 14, *) {
			let webpagePreferences = WKWebpagePreferences()
			webpagePreferences.allowsContentJavaScript = true
			configuration.defaultWebpagePreferences = webpagePreferences
		} else {
			preferences.javaScriptEnabled = true
		}
		preferences.javaScriptCanOpenWindowsAutomatically = true
		preferences.minimumFontSize = 10
		configuration.preferences = preferences
		let webview = WKWebView(frame: UIScreen.main.bounds, configuration: configuration)
		webview.navigationDelegate = self
		return webview
	}

	func dicValueString(_ dic:[String:Any]) ->String? {
		let data = try? JSONSerialization.data(withJSONObject: dic,options: [])
		let str = String(data: data!,encoding:String.Encoding.utf8)
		return str
	}
    
}

extension WebViewController: WKScriptMessageHandler {

	func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
		//TODO:  拦截一些h5的事件
	}
}

extension WebViewController: WKNavigationDelegate {

	func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
		progressView.alpha = 1
		navigationDelegate?.webView?(webview, didStartProvisionalNavigation: navigation)
	}


	func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
		UIView.animate(withDuration: 0.2) {
			self.progressView.alpha = 0
		}
		navigationDelegate?.webView?(webview, didFinish: navigation)
	}

	func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
		UIView.animate(withDuration: 0.2) {
			self.progressView.alpha = 0
		}
		navigationDelegate?.webView?(webView, didFailProvisionalNavigation: navigation, withError: error)
	}
}