MTP2.0_iOS_FXGL/MTP_iOS/MTP2_iOS/UserInterface/Home/NewsDetailViewController.swift

//
//  NewsDetailViewController.swift
//  MTP2_iOS
//
//  Created by Muchinfo on 2021/6/22.
//  Copyright © 2021 Muchinfo. All rights reserved.
//

import UIKit
import WebKit
import WHToast
import ActionSheetPicker_3_0

// 新闻详情视图容器控制类
class NewsDetailViewController: BaseViewController {
 
    // MARK: - 属性列表
    /// 滚动视图
    @IBOutlet weak var scrollView: UIScrollView!
    /// 发布日期
    @IBOutlet weak var date: UILabel!
    /// 发布标题
    @IBOutlet weak var text: UILabel!
    /// 内容状态视图
    @IBOutlet weak var webView: WKWebView! {
        didSet {
            webView.uiDelegate = self
            webView.navigationDelegate = self
            webView.scrollView.showsVerticalScrollIndicator = false
            webView.scrollView.showsHorizontalScrollIndicator = false
            webView.isOpaque = false
        }
    }
    /// 高度约束
    @IBOutlet weak var heightLayoutConstraint: NSLayoutConstraint!
    /// 字体大小
    @IBOutlet weak var font: UIBarButtonItem!
    
    /// titles
    let titles = ["极小", "小", "中", "大", "极大"]
    /// values
    let values: [CGFloat] = [0.8, 0.9, 1.0, 1.5, 2.0]
    
    // MARK: - 生命周期相关
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        /// loding.....
        addLoadingView()
        /// 异常
        guard let obj = takeInfo as? MoSiteColumnDetail else { return }
        /// 发布日期
        date.text = obj.creaedate.isBlank()
        /// 发布标题
        text.text = obj.title
        /// 加载视图
        webView.loadHTMLString(obj.context.getUrlString(), baseURL: nil)
    }
    
    @IBAction fileprivate func onBarButtonItemPressed(_ sender: UIBarButtonItem) {
        switch sender {
        case font:
            let select = values.firstIndex(of: UserDefaultsUtils.fontSize()) ?? 3
            ActionSheetStringPicker.show(withTitle: "设置字体大小", rows: titles, initialSelection: select, doneBlock: { picker, value, index in
                                            UserDefaultsUtils.setFontSize(CGFloat(self.values[value]))
                                            /// 异常
                                            guard let obj = self.takeInfo as? MoSiteColumnDetail else { return }
                                            /// 加载视图
                                            self.webView.loadHTMLString(obj.context.getUrlString(), baseURL: nil)
                                         }, cancel: { picker in
                                            return
                                         }, origin: self.view)
        default:
            break
        }
    }
}

// MARK: - WKUIDelegate, WKNavigationDelegate
extension NewsDetailViewController: WKUIDelegate, WKNavigationDelegate {
    /// didFinish
    /// - Parameters:
    ///   - webView: webView
    ///   - navigation: navigation
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        /// stopAnimating
        _anim?.stopAnimating()
        /// 图片缩放比例不正确问题
        webView.evaluateJavaScript("""
                var imgs = document.getElementsByTagName("img")
                for (var i = 0; i < imgs.length; i++) {
                    imgs[i].setAttribute('width', '100%')
                }
                """,completionHandler: nil)
        
        webView.evaluateJavaScript("""
                var oMeta = document.createElement('meta');
                oMeta.content = 'width=device-width, initial-scale=1, user-scalable=0';
                oMeta.name = 'viewport';
                document.getElementsByTagName('head')[0].appendChild(oMeta);
                """,completionHandler: nil)
        
        /// 动态计算webView内容高度
        webView.evaluateJavaScript("document.body.scrollHeight") { [unowned self] (result, error) in
            if let height: Double = result as? Double {
                self.heightLayoutConstraint.constant = CGFloat(height)
            }
        }
        let select = UserDefaultsUtils.fontSize()
        /// 设置字体大小
        webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '\(select*100)%'", completionHandler: nil)
        /// 设置颜色
        webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.webkitTextFillColor= '#333333'", completionHandler:nil)
        /// 设置webView 内容背景色
        webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.background='#FFFFFF'") { (result, error) in }
    }
    
    /// didFail
    /// - Parameters:
    ///   - webView: webView
    ///   - navigation: navigation
    ///   - error: error
    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
        WHToast.showMessage(error.localizedDescription, duration: ToastTimer, finishHandler: {})
    }
    
    /// didStartProvisionalNavigation
    /// - Parameters:
    ///   - webView: webView
    ///   - navigation: navigation
    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
        /// startAnimating
        _anim?.startAnimating()
        /// 设置webView 内容背景色
        webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.background='#FFFFFF'") { (result, error) in }
    }
}