PDF 文件不显示 ios

Question

我在Firebase服务器上有几个pdf文件，我需要在应用中向用户显示。 但问题是，它既没有在webview中显示pdf文件，也不会在WKWebView中显示pdf文件。 我尝试了以下代码片段，但都没有奏效。

if let url = URL(string: urlString){
// First Approach          
if let data = try? Data(contentsOf: url) {
webView.load(data, mimeType: "application/pdf", characterEncodingName: "", baseURL: url)
}
// Second Approach 
let req = URLRequest(url: url)
self.webView.load(req)
}

这是其中一个网址。 pdf 文件

我也使用了PDFKit，但这也不起作用。这是我尝试将其加载到 Web 视图中时的日志。

2020-05-21 21:06:01.561593+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:10.383853+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:10.384063+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:13.050745+0500 Mini Muslims[41242:748634] Task <5CBC8251-89EC-4DCD-A9A0-E794B3AEB6EC>.<0> HTTP load failed, 0/0 bytes (error code: -999 [1:89])
2020-05-21 21:06:18.123494+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:18.123672+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:18.173099+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:18.173315+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:19.260676+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:19.260878+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:22.607212+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:22.607351+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:23.080709+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:23.080916+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:28.736644+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:28.736875+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO
2020-05-21 21:06:36.769000+0500 Mini Muslims[41242:748632] WF: _userSettingsForUser : (null)
2020-05-21 21:06:36.769220+0500 Mini Muslims[41242:748632] WF: _WebFilterIsActive returning: NO

PDF 从不加载。可能出现的问题是什么。请指导我，以便我解决此问题。

Answer 1

使用以下代码加载pdf文件WKWebView

import UIKit
import WebKit
class ViewController: UIViewController,UIWebViewDelegate,UIScrollViewDelegate, WKUIDelegate {
var WKwebView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
let userContentController: WKUserContentController = WKUserContentController()
let conf = WKWebViewConfiguration()
conf.userContentController = userContentController
WKwebView = WKWebView (frame: CGRect( x: 0, y: 60, width: self.view.frame.width, height: self.view.frame.height - 60 ), configuration: WKWebViewConfiguration())
WKwebView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
WKwebView.uiDelegate = self
WKwebView.scrollView.bounces = false
WKwebView.scrollView.delegate = self;
view.addSubview(WKwebView)
var request : URLRequest!
let PDFURL = "https://firebasestorage.googleapis.com/v0/b/mini-muslims.appspot.com/o/Books%2F-M5HgblfIM4jvINka3j2?alt=media&token=745ca3e3-b18b-4b2a-96c1-e791f977c2df";
let url : URL = URL(string: PDFURL as String)!
request = URLRequest (url: url);
WKwebView.load(request)
}
}