IOS WKWebView Fileupload不起作用

Question

我试图在WKWebView中运行Web应用程序，在我选择照片库中的图像后，它返回主页并且不上传图像。我收到了以下信息：

2018-02-11 14：35：22.870494-0200网球[7144：194670] [MC]从私人有效用户设置中读取。 2018-02-11 14:35：44.753840-0200网球[7144：195114] [发现]发现扩展时遇到的错误：错误域= PlugInKit代码= 13＆＃34;查询已取消＆＃34; UserInfo = {NSLocalizedDescription =查询已取消}

我的代码：

import UIKit
import WebKit
class ViewController: UIViewController, UIImagePickerControllerDelegate,UINavigationControllerDelegate {

    @IBOutlet weak var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func viewDidAppear(_ animated: Bool) {

        let url:URL = URL(string: "http://serivinho:8001/")!
        let urlRequest: URLRequest = URLRequest(url: url)
        webView.load(urlRequest);
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func dismiss(animated flag: Bool, completion: (() -> Void)?)
    {
        if self.presentedViewController != nil {
            super.dismiss(animated: flag, completion: completion)
        }
    }
}

我的信息列表

Answer 1

当我将代码从viewDidAppear移到ViewDidLoad时似乎问题已经消失

   override func viewDidLoad() {

        let url:URL = URL(string: "http://serivinho:8001/")!
        let urlRequest: URLRequest = URLRequest(url: url)
        webView.load(urlRequest);
    }

我还将目标版本更改为10.3，并在代码中添加了WKWebView，而不是在mainstoryboard中。

我仍然收到一些日志消息，但他们没有阻止工作：

18-02-11 20:25:01.535257-0200 Tennis[406:75090] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction
2018-02-11 20:25:01.537713-0200 Tennis[406:75090] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction
2018-02-11 20:25:10.228575-0200 Tennis[406:75090] [Generic] Creating an image format with an unknown type is an error
2018-02-11 20:25:52.676053-0200 Tennis[406:75090] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction
2018-02-11 20:25:52.676252-0200 Tennis[406:75090] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction
2018-02-11 20:25:58.340272-0200 Tennis[406:75090] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction
2018-02-11 20:25:58.340458-0200 Tennis[406:75090] [App] if we're in the real pre-commit handler we can't actually add any new fences due to CA restriction

Answer 2

我一直遇到这个问题，因为我在SELECT id/2 AS pair_id, avg(value) AS pair_avg FROM (SELECT row_number() OVER (ORDER BY id) + 1 AS id, value FROM tbl) t GROUP BY 1 ORDER BY 1;中也有webView.load(urlRequest);。

如前所述，您只需要在viewDidAppear 中添加 webView.load(urlRequest);。

原因是因为调用图库或相机会打开OS对话框来拍照或拍照，完成后，ViewController将再次调用viewDidLoad和viewWillAppear回调，这将重新触发您的初始Webview负载（刷新页面）。

Answer 3

正如marc_ferna所说，了解从选择图片对话框中回调后重新加载webview至关重要。因此，如果您将其放置在viewDidLoad中（例如，viewDidAppear）中不存在的位置，则您的网页会在选择图片对话框之后立即重新加载，并且无法完全在网络上上传。