platform-ios/RainbowPlanet/RainbowPlanet/Base/BaseWebViewController/BaseJSWebBaseViewController.swift

//
//  BaseJSWebBaseViewController.swift
//  RainbowPlanet
//
//  Created by 南鑫林 on 2019/6/20.
//  Copyright © 2019 RainbowPlanet. All rights reserved.
//

import UIKit
import WebKit
import WebViewJavascriptBridge

class BaseJSWebBaseViewController: BaseViewController {

    deinit {
        removeWebView()
    }
    //加载普通URL
    var URLString : String?
    //加载本地URL
    var HTMLName : String?
    //保存请求链接
    var snapShotsArray:Array<Any>?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupViews()
        
        
    }
    
    override func setupViews() {
        view.addSubview(wkWebView)
        view.addSubview(progressView)
        WebViewJavascriptBridge.enableLogging()
    }
    
    override func setupData() {
        //// 加载普通URL
        if (URLString != nil) {
            NXLLog(URLString!)
            webloadType(.URLString(url: URLString!))
        }
        
        // 加载本地URL
        if (HTMLName != nil ) {
            webloadType(.HTMLName(name: HTMLName!))
        }
        
        navigationBar.onClickLeftButton = {
            self.wkWebView.stopLoading()
            if self.wkWebView.canGoBack {
                self.goBack()
            }else {
                self.navigationController?.popViewController(animated: true)
            }
        }
    }
    
    lazy var bridge: WebViewJavascriptBridge = {
        let bridge = WebViewJavascriptBridge(forWebView: self.wkWebView)
        bridge?.setWebViewDelegate(self)
        return bridge!
    }()
    
    lazy var wkWebView: WKWebView = {
        /// 创建webveiew
        let wkWebView = WKWebView(frame: CGRect(x: 0, y: kNavBarTotalHeight, width: kScreenWidth, height: kScreenHeight-kNavBarTotalHeight))
        // 监听支持KVO的属性
        wkWebView.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil)
        wkWebView.addObserver(self, forKeyPath: "title", options: .new, context: nil)
        return wkWebView
    }()
    
    /// 进度条
    lazy var progressView: UIProgressView = {
        let progressView =  UIProgressView(progressViewStyle: .default)
        progressView.frame = CGRect(x: CGFloat(0.0), y:kNavBarTotalHeight, width: CGFloat(wkWebView.width), height: 3)
        progressView.trackTintColor = UIColor.clear
        progressView.progressTintColor = kThemeColor
        return progressView
    }()
    
    /// 加载webView
    func webloadType(_ loadType:WKWebLoadType) {
        switch loadType {
        case .URLString(let urltring):
            let urlstr = URL(string: urltring)
            let request = URLRequest(url: urlstr!)
            wkWebView.load(request)
        case .HTMLName(let string):
            loadHost(string: string)
        default:
            break
        }
    }
    
    
    /// 加载本得html
    ///
    /// - Parameter string: <#string description#>
    func loadHost(string:String) {
        let path = Bundle.main.path(forResource: string, ofType: "html")
        // 获得html内容
        do {
            let html = try String(contentsOfFile: path!, encoding: String.Encoding.utf8)
            // 加载js
            wkWebView.loadHTMLString(html, baseURL: Bundle.main.bundleURL)
        } catch { }
    }
    
    /// 刷新
    public func reload() {
        wkWebView.reload()
    }
    
    /// 后退
    public func goBack() {
        wkWebView.goBack()
    }
    
    /// 前进
    public func goForward() {
        wkWebView.goForward()
    }
    
    /// 遗传webView
    public func removeWebView(){
        wkWebView.removeObserver(self, forKeyPath: "estimatedProgress")
        wkWebView.navigationDelegate = nil
        wkWebView.uiDelegate = nil
        self.view.removeFromSuperview()
    }
    
    //请求链接处理
    func pushCurrentSnapshotView(_ request: NSURLRequest) -> Void {
        // 连接是否为空
        guard let urlStr = snapShotsArray?.last else { return }
        // 转换成URL
        let url = URL(string: urlStr as! String)
        // 转换成NSURLRequest
        let lastRequest = NSURLRequest(url: url!)
        // 如果url是很奇怪的就不push
        if request.url?.absoluteString == "about:blank"{ return }
        // 如果url一样就不进行push
        if (lastRequest.url?.absoluteString == request.url?.absoluteString) {return}
        // snapshotView
        let currentSnapShotView = wkWebView.snapshotView(afterScreenUpdates: true);
        //向数组添加字典
        snapShotsArray = [["request":request,"snapShotView":currentSnapShotView]]
    }
    
    open override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "estimatedProgress"{
            // 设置进度条透明度
            progressView.alpha = CGFloat(1.0 - wkWebView.estimatedProgress)
            // 给进度条添加进度和动画
            progressView.setProgress(Float(wkWebView.estimatedProgress), animated: true)
            // 结束进度
            if Float(wkWebView.estimatedProgress) >= 1.0{
                progressView.alpha = 0.0
                progressView .setProgress(0.0, animated: false)
            }
           NXLLog(wkWebView.estimatedProgress)
        }else if keyPath == "title" {
            let vc = wkWebView.findViewController() as? BaseViewController
            _ = vc?.navigationBar.title = wkWebView.title
        }else {
            super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
            
        }
    }
}