问题
I am working on migrating UIWebView to WKWebView. I have changed all the Delegate methods. I need WKWebView delegate methods equal to below UIWebView delegate method. The app is working fine. but login session is not retaining
UIWebView:
extension WebViewController: UIWebViewDelegate {
func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
guard let url = request.url else {
return true
}
guard !url.absoluteString.contains("data:application/pdf") else {
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.action,
target: self,
action: #selector(share(sender:)))
return true
}
guard url.pathExtension != "pdf" else {
let safariVC = SFSafariViewController(url: url)
safariVC.modalPresentationStyle = .popover
present(safariVC, animated: true, completion: nil)
return false
}
guard url.isLogin() == false else {
AppDelegate.navigationController.signOut(.sessionOnly)
return false
}
guard let mobileSite = url.asMobileSite() else {
return true
}
let mobileRedirect = URLRequest(url: mobileSite)
webView.loadRequest(mobileRedirect)
return false
}
func webViewDidStartLoad(_ webView: UIWebView) {
numberOfDidStartLoads += 1
}
func webViewDidFinishLoad(_ webView: UIWebView) {
numberOfDidStartLoads -= 1
}
func webView(_ webView: UIWebView, didFailLoadWithError error: Error) {
numberOfDidStartLoads -= 1
}
}
And i tried below code and getting session expire.
extension WebViewController: UIWebViewDelegate {
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (_: WKNavigationActionPolicy) -> Void) {
guard let url = navigationAction.request.url else {
decisionHandler(.allow)
return
}
guard !url.absoluteString.contains("data:application/pdf") else {
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.action,
target: self,
action: #selector(share(sender:)))
decisionHandler(.allow)
return
}
guard url.pathExtension != "pdf" else {
let safariVC = SFSafariViewController(url: url)
safariVC.modalPresentationStyle = .popover
present(safariVC, animated: true, completion: nil)
decisionHandler(.cancel)
return
}
guard url.isLogin() == false else {
AppDelegate.navigationController.signOut(.sessionOnly)
decisionHandler(.cancel)
return
}
guard let mobileSite = url.asMobileSite() else {
decisionHandler(.allow)
return
}
let mobileRedirect = URLRequest(url: mobileSite)
webView.load(mobileRedirect)
decisionHandler(.cancel)
return
decisionHandler(.allow)
}
func webViewDidStartLoad(_ webView: UIWebView) {
numberOfDidStartLoads += 1
}
func webViewDidFinishLoad(_ webView: UIWebView) {
numberOfDidStartLoads -= 1
}
func webView(_ webView: UIWebView, didFailLoadWithError error: Error) {
numberOfDidStartLoads -= 1
}
}
Please help me to resolve this issue. I have made some mistake in changing code from UIWebView to WKWebView.
回答1:
You might required to implement the following in your code, which means instead of using UIWebViewDelegate protocol try to use WKNavigationDelegate protocol. I guess you are missing one of the most important function when you are handling with sessions.
func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
print(#function)
completionHandler(.performDefaultHandling,nil)
}
There are different types of AuthChallengeDisposition , like
public enum AuthChallengeDisposition : Int {
case useCredential
case performDefaultHandling
case cancelAuthenticationChallenge
case rejectProtectionSpace
}
Complete WKNavigationDelegate protocols are
extension ViewController: WKNavigationDelegate{
func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
print(#function)
}
func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
print(#function)
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
print(#function)
}
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
print(#function)
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
print(#function)
}
func webView(_ webView: WKWebView, didReceiveServerRedirectForProvisionalNavigation navigation: WKNavigation!) {
print(#function)
}
func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
print(#function)
}
func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
print(#function)
completionHandler(.performDefaultHandling,nil)
}
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
print(#function)
decisionHandler(.allow)
}
func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
print(#function)
decisionHandler(.allow)
}
}
回答2:
I guess you can use webView(_:decidePolicyFor:decisionHandler:) and you block/cancel or allow requests. That should work in the same way.
Disclaimer: I haven't tested that yet, I'll do so as soon as I find some time.
回答3:
analyzing your code, i have found a statement that is never reached cause of "return" called before.
The statement is:
decisionHandler(.allow)
You can find it as last line of code for the function:
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (_: WKNavigationActionPolicy) -> Void)
that you have up this method:
func webViewDidStartLoad(_ webView: UIWebView) {
numberOfDidStartLoads += 1
}
来源：https://stackoverflow.com/questions/46171410/migrating-uiwebview-delegate-to-wkwebview-delegate-method