问题
I have a WKWebView which should load the following url:
https://buchung.salonmeister.de/place/#offer-details-page?id=907599&venueId=301655
Her is the code I use:
import UIKit
import WebKit
class MMWKBrowserController: UIViewController {
private let closeButtonSelector: Selector = "closeButtonTapped:"
private var urlString: String
private let request: NSMutableURLRequest
private var webView: WKWebView!
private var twoLineTitleView: UIView!
private var titleLabel: UILabel?
private var subTitleLabel: UILabel?
private var indicator: UIActivityIndicatorView!
init(urlString: String) {
self.urlString = urlString
println("*** Using MMWKBrowserController ***")
var url: NSURL? = NSURL(string: urlString)
if url == nil {
var escapedString: String = urlString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
self.urlString = escapedString
url = NSURL(string: escapedString)
}
println("url: \(url)")
request = NSMutableURLRequest(URL: url!)
request.setValue("Mozilla/5.0 (iPhone; CPU iPhone OS 8_4 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12H141 Safari/600.1.4", forHTTPHeaderField: "UserAgent")
super.init(nibName: nil, bundle: nil)
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
deinit {
self.webView.removeObserver(self, forKeyPath: "loading")
self.webView.removeObserver(self, forKeyPath: "title")
self.webView.removeObserver(self, forKeyPath: "URL")
self.webView.removeObserver(self, forKeyPath: "estimatedProgress")
self.webView.stopLoading()
}
override func viewDidLoad() {
super.viewDidLoad()
createNavigationView()
self.navigationController?.navigationBar.tintColor = MGColor.actionColor
let config = WKWebViewConfiguration()
self.webView = WKWebView(frame: self.view.bounds, configuration: config)
self.view.addSubview(self.webView)
indicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)
//indicator.backgroundColor = UIColor(white: 0.1, alpha: 0.5)
webView.addSubview(indicator)
self.webView.snp_makeConstraints { (make) -> Void in
make.edges.equalTo(self.view)
}
indicator.snp_makeConstraints { (make) -> Void in
make.center.equalTo(self.webView)
}
webView.addObserver(self, forKeyPath: "loading", options: NSKeyValueObservingOptions.New, context: nil)
webView.addObserver(self, forKeyPath: "title", options: NSKeyValueObservingOptions.New, context: nil)
webView.addObserver(self, forKeyPath: "URL", options: NSKeyValueObservingOptions.New, context: nil)
webView.addObserver(self, forKeyPath: "estimatedProgress", options: NSKeyValueObservingOptions.New, context: nil)
}
override func viewDidDisappear(animated: Bool) {
super.viewDidDisappear(animated)
self.webView.stopLoading()
}
private func createNavigationView() {
let closeItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Stop, target: self, action: closeButtonSelector)
self.navigationItem.leftBarButtonItem = closeItem
// create center view
let titleViewWidth = self.view.frame.size.width - 100
twoLineTitleView = UIView(frame: CGRectMake(0, 0, titleViewWidth, 44))
titleLabel = UILabel(frame: CGRectMake(0, 6, titleViewWidth, 16))
titleLabel?.backgroundColor = UIColor.clearColor()
titleLabel?.font = UIFont.boldSystemFontOfSize(16)
titleLabel?.textAlignment = NSTextAlignment.Center
subTitleLabel = UILabel(frame: CGRectMake(0, 21, titleViewWidth, 20))
subTitleLabel?.backgroundColor = UIColor.clearColor()
subTitleLabel?.font = UIFont.systemFontOfSize(10)
subTitleLabel?.textAlignment = NSTextAlignment.Center
twoLineTitleView.addSubview(titleLabel!)
twoLineTitleView.addSubview(subTitleLabel!)
self.navigationItem.titleView = twoLineTitleView
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.webView.loadRequest(self.request)
}
func closeButtonTapped(sender: UIBarButtonItem) {
self.presentingViewController?.dismissViewControllerAnimated(true, completion: nil)
}
override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
if let wk = object as? WKWebView {
switch keyPath {
case "loading":
if let val: AnyObject = change[NSKeyValueChangeNewKey] {
if let val = val as? Bool {
if val {
self.indicator.startAnimating()
}
else {
self.indicator.stopAnimating()
}
}
}
case "title":
self.titleLabel?.text = self.webView.title
case "URL":
self.subTitleLabel?.text = self.webView.URL?.URLString
case "estimatedProgress":
println("progress: \(Int32(self.webView.estimatedProgress*100))")
default: break
}
}
}
}
Note: I use SDK iOS 8.4
Why does mobile Safari loads this url but WKWebView does not?
回答1:
Add this to your plist
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
Here's the explanation for this change in 9.0 http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/
Also if you want to set it up more secure it gives you a more complex way to do that.
回答2:
For me, the issue was caused by server trust check from the WKWebView.
To fix this I had to handle the challenge authentication callback and return a server trust credential.
Swift 4
func webView(_ webView: WKWebView,
didReceive challenge: URLAuthenticationChallenge,
completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void)
{
if(challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust)
{
let cred = URLCredential(trust: challenge.protectionSpace.serverTrust!)
completionHandler(.useCredential, cred)
}
else
{
completionHandler(.performDefaultHandling, nil)
}
}
回答3:
I had a similar problem with a site that was also protected with a high security TLS 1.2 certificate. To get the WKWebView to accept the server's certificate, I added this code to my web view controller delegate:
-(void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler
{
if ([[[challenge protectionSpace]authenticationMethod] isEqualToString: @"NSURLAuthenticationMethodServerTrust"]) {
SecTrustRef serverTrust = challenge.protectionSpace.serverTrust;
CFDataRef exceptions = SecTrustCopyExceptions(serverTrust);
SecTrustSetExceptions(serverTrust, exceptions);
CFRelease(exceptions);
newCredential = [NSURLCredential credentialForTrust:serverTrust];
completionHandler(NSURLSessionAuthChallengeUseCredential, newCredential);
} else {
completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, newCredential);
}
}
回答4:
If you are in a sandboxed macOS app, you'll need to set the Outgoing Connections (Client) capability, you won't need to mess with Allow Abitrary Loads which shouldn't come into play for trusted https requests.
For iOS however, allowing client connections is the default, so you may need to implement WKNavigationDelegate methods to handle security. Make sure you aren't just trusting untrusted certificates though. This Swift Talk video from objc.io is the best resource I know of, definitely worth 20 minutes if you're working in this area: https://talk.objc.io/episodes/S01E57-certificate-pinning
回答5:
not sure if the same error reason, but the problem was the same for me under iOS9
some domains couldn't be loaded
turned out that the problem was in
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler {
and providing back
completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
where I should have returned
completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, nil);
I was using WRONG code from https://github.com/ShingoFukuyama/WKWebViewTips
回答6:
// Add plist file
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
<key>NSExceptionDomains</key>
<dict>
<key>google.com</key>
<dict>
<key>NSExceptionAllowsInsecureHTTPLoads</key>
<true/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
</dict>
if WKWebView not support then declare .m file below code:
@interface WebScannerViewController()
{
WKWebView *webView;
}
@end
@implementation WebScannerViewController
- (void)viewDidLoad {
[super viewDidLoad];
webView.hidden=YES;
webView.UIDelegate = self;
webView.navigationDelegate = self;
self.loadingSign.hidden = NO;
webView.frame=CGRectMake(0, 94, Width, Height-128);
}
来源：https://stackoverflow.com/questions/32437577/wkwebview-does-not-load-https-url