WKWebView ã§ã¯ WKNavigationDelegate ã® webView:didReceiveAuthenticationChallenge:completionHandler: ãå®è£ ãããã¨ã«ãªãã¾ãã èªè¨¼ãå¿ è¦ãªãµã¤ãã«ã¢ã¯ã»ã¹ããå ´åãã¦ã¼ã¶ã¼åããã¹ã¯ã¼ãã®å ¥åãæ±ããã¢ã©ã¼ãã表示ããããã«ãã¦ã¿ã¾ããã func webView(webView: WKWebView!, didReceiveAuthenticationChallenge challenge: NSURLAuthenticationChallenge!, completionHandler: ((NSURLSessionAuthChallengeDisposition, NSURLCredential!) -> Void)!) { let alertController = UIAlertCon
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