我在通过 wkwebview 加载的页面上有一个 html input type="file" 上传表单，并且我试图允许上传常见文档文件（pdf、docx 等）的能力。目前我可以拍照和浏览图片，但是文档是灰色的并且不可用。我是一名网络开发人员，对我来说 swift 是希腊语，所以任何帮助将不胜感激！
这是我的视图控制器
import UIKit
import WebKit
import IJProgressView
import FirebaseMessaging
class ViewController: UIViewController, WKNavigationDelegate {
let webView = WKWebView()
var initialstart = true
override func viewDidLoad() {
webView.backgroundColor = UIColor(red:0.17, green:0.24, blue:0.31, alpha:1.0)
webView.isOpaque = false
webView.allowsBackForwardNavigationGestures = true
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.receivedUrlFromPushNotification(notification:)), name: NSNotification.Name(rawValue: "ReceivedPushNotification"), object: nil)
// Do any additional setup after loading the view, typically from a nib.
guard let url = URL(string: "https://www.website.com/users/account") else { return};
webView.frame = view.bounds;
webView.navigationDelegate = self;
webView.load(URLRequest(url: url));
webView.autoresizingMask = [.flexibleWidth, .flexibleHeight];
view.addSubview(webView)
}
func receivedUrlFromPushNotification (notification: Notification) {
let notification: [AnyHashable : Any] = notification.userInfo!
let url = URL(string: notification["url"] as! String);
webView.load(URLRequest(url: url!))
}
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
if navigationAction.navigationType == .linkActivated {
if let url = navigationAction.request.url,
let host = url.host, !host.hasPrefix("www.website.com"),
UIApplication.shared.canOpenURL(url) {
if #available(iOS 10.0, *) {
UIApplication.shared.open(url)
} else {
// Fallback on earlier versions
UIApplication.shared.openURL(url)
}
decisionHandler(.cancel)
} else {
decisionHandler(.allow)
}
} else {
decisionHandler(.allow)
}
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
let url = webView.url;
let path = url?.path;
UIApplication.shared.isNetworkActivityIndicatorVisible = false
IJProgressView.shared.hideProgressView()
view.isOpaque = true
}
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
if (initialstart == true) {
initialstart = false
} else {
UIApplication.shared.isNetworkActivityIndicatorVisible = true
IJProgressView.shared.showProgressView(view)
}
}
}