WKWebView 使用

.H
typedef NS_ENUM(int, FromeType) {
    From_MainShop = 1,
    From_Category = 2
};
@interface WKWebVC : BaseVC
@property (nonatomic, strong) NSString *url;
@property (nonatomic, strong) NSString *titleText;
@property (nonatomic, assign) BOOL isShippingStatus;
@property (nonatomic, assign) FromeType fromType;
@property (nonatomic, copy) void(^checkMySizeResult)(NSString *size);
@property (nonatomic, assign) BOOL isTabVC;
@end

.M
@interface WKWebVC () <WKNavigationDelegate, FBSDKSharingDelegate, LoginDelegate, UILoadingViewDelegate, WKScriptMessageHandler>
@property (nonatomic, strong) UILoadingView *loadingView;
@property (weak, nonatomic) IBOutlet UILabel *titleLb;
@property (weak, nonatomic) IBOutlet UIImageView *titleDiliver;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *indicator;
@property (nonatomic, strong) WKUserContentController *userContentController;
@property (weak, nonatomic) IBOutlet UIButton *backBtn;
@property (nonatomic, strong) WKWebView *webView;
@end


- (void)viewDidLoad {
    [super viewDidLoad];
    [self.indicator setHidesWhenStopped:YES];
    self.titleLb.text=self.titleText;
    
    //配置信息
    WKWebViewConfiguration *config=[[WKWebViewConfiguration alloc] init];
    config.preferences=[[WKPreferences alloc]init];
//    config.preferences.minimumFontSize = 10;
    config.preferences.javaScriptEnabled = true;
    // 默认是不能通过JS自动打开窗口的，必须通过用户交互才能打开
    config.preferences.javaScriptCanOpenWindowsAutomatically =true;
    // 通过js与webview内容交互配置
     self.userContentController = [[WKUserContentController alloc]init];
    config.userContentController = self.userContentController;
    // 添加一个名称，在JS通过这个名称发送消息
    [config.userContentController addScriptMessageHandler:self name:@"theyub"];
    
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, ZKScreenW, ZKScreenH) configuration:config];
    webView.navigationDelegate = self;
    [self.view addSubview:webView];
    self.webView = webView;
    
    self.loadingView=[UILoadingView instanceViewWithSuperView:self.view delegate:self];
    self.loadingView.delegate=self;
    [self.view bringSubviewToFront:self.indicator];
    
    [webView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.titleDiliver.mas_bottom);
        make.leading.equalTo(self.view.mas_leading);
        make.trailing.equalTo(self.view.mas_trailing);
        if (self.isTabVC) {
            make.bottom.equalTo(self.view.mas_bottom).with.offset(-49);
        } else {
            make.bottom.equalTo(self.view.mas_bottom);
        }
    }];
    
    // 获取 url
    if (self.isTabVC) {
        [self getUrlRequest];
    } else {
        HttpManager * httpManager = [HttpManager sharedManager];
        id<GAITracker> tracker = [[GAI sharedInstance] trackerWithTrackingId:GAP_TRACKING_ID];
        NSString *clientid = [tracker  get:kGAIClientId];
        
        self.url = [NSString stringWithFormat:@"%@?app_token=%@&userId=%d&cid=%@&app_equip=ios&language=%@&siteUID=%@&currency=%@&device_type=ios",self.url,httpManager.meInfo.token,httpManager.meInfo.member_id,clientid,[PhoneUtil getCurrentLanguage], [httpManager getCurrentSiteUid], [FileUtil getCurrency].code];
        // @"http://www.ifeng.com";
        NSURL *url=[NSURL URLWithString:self.url];
        [self.webView loadRequest:[self headForRequest:url]];
        [self.loadingView setHidden:YES];
    }
    
    if (self.titleText.length <= 0) {  // 添加KVO监听网页Title 变化
        [self.webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:@"WKWebVC"];
    }
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
    if (self.titleText.length <=0 ) {  // 如果 没有标题  取网页的标题
        if ([keyPath isEqualToString:@"title"]) {
            self.titleLb.text = self.webView.title;
        }
    }
}

// 页面已经消失的时候 移除KVO和命名空间
- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    if (!self.isTabVC) {  
        NSArray *vcs = self.navigationController.viewControllers;
        if (vcs.count > 0) {
            UIViewController *lastVC = [vcs lastObject];
            if ([lastVC isKindOfClass:[self class]]) {
                [self removeScriptAndObserver];
            }
        } else {  // 页面已经消失
            [self removeScriptAndObserver];
        }
    }
}
- (void)removeScriptAndObserver {
    @try {
        [self.userContentController removeScriptMessageHandlerForName:@"theyub"];
        [self.webView removeObserver:self forKeyPath:@"title" context:@"WKWebVC"];
    } @catch (NSException *exception) {
        NSLog(@"========%@", exception);
    } @finally {}
}

- (IBAction)popVC:(id)sender {
    if (self.webView.canGoBack) {
        [self.webView goBack];
        return;
    }
    [self.navigationController popViewControllerAnimated:YES];
}


- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    NSLog(@"=============%@", message.body);
    NSString *jsonString = [NSString stringWithFormat:@"%@", message.body];
    if (jsonString.length > 0) {
        NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        NSLog(@"=============%@", dict);
        NSString *method = parseStringFromDict(@"method", dict);  // 根据方法名判断需要执行的方法
        if ([method isEqualToString:@"webToMobile"]) {
            [self webToMobile:jsonString];
        } else if ([method isEqualToString:@"webToMobileAction"]) {
            [self webToMobileAction:jsonString];
        }
    }
}

// 获取URL
- (void)getUrlRequest {
    ExclusiveHttpRequest *req = [[ExclusiveHttpRequest alloc] init];
    [req getExclusiveRequstCallback:^(BOOL success, NSObject *result, NSString *errorMsg) {
        if (success) {
            self.url = (NSString *)result;
            if (self.url .length > 0) {
                HttpManager * httpManager = [HttpManager sharedManager];
                id<GAITracker> tracker = [[GAI sharedInstance] trackerWithTrackingId:GAP_TRACKING_ID];
                NSString *clientid = [tracker  get:kGAIClientId];
                
                self.url = [NSString stringWithFormat:@"%@?app_token=%@&userId=%d&cid=%@&app_equip=ios&language=%@&siteUID=%@&currency=%@&device_type=ios",self.url,httpManager.meInfo.token,httpManager.meInfo.member_id,clientid,[PhoneUtil getCurrentLanguage], [httpManager getCurrentSiteUid], [FileUtil getCurrency].code];
                NSURL *url=[NSURL URLWithString:self.url];
                
                [self.webView loadRequest:[self headForRequest:url]];
                
                [self.loadingView setHidden:YES];
            } else {
                [self.loadingView showErrorView];
            }
            
        } else {
            [self.loadingView showErrorView];
            [UIToastUtil showToast:self.view message:errorMsg];
        }
    }];
}

//返回一个urlRequest 对象,
- (NSMutableURLRequest*)headForRequest:(NSURL*)url{
    NSMutableURLRequest *request=[[NSMutableURLRequest alloc] initWithURL:url];
    NSString *preferredLang = [PhoneUtil getCurrentLanguage];
    if([preferredLang hasPrefix:@"zh-Hant"]){
        if([[[HttpManager sharedManager] getLocalCountry] isOrderedSameString:@"TW"]){
            preferredLang=@"zh-tw";
        }else if([[[HttpManager sharedManager] getLocalCountry] isOrderedSameString:@"HK"]){
            preferredLang=@"zh-hk";
        }else{
            preferredLang=@"zh-tw";
        }
    }
    
    HttpManager * httpManager = [HttpManager sharedManager];
    [request addValue:[FileUtil getCurrency].code forHTTPHeaderField:@"Currency"];
    [request addValue:preferredLang forHTTPHeaderField:@"Language"];
    
    [request addValue:@"iPhone" forHTTPHeaderField:@"Devtype"];
    [request addValue:[HttpManager sharedManager].UUID forHTTPHeaderField:@"dev_id"];
    
    [request setValue:@"app" forHTTPHeaderField:@"SiteUID"];
    if([httpManager getLocalCountry]){
        [request setValue:[httpManager getLocalCountry] forHTTPHeaderField:@"LocalCountry"];
    }
    if([HttpManager sharedManager].meInfo && [HttpManager sharedManager].meInfo.member_id){
        [request setValue:[NSString stringWithFormat:@"%d",[HttpManager sharedManager].meInfo.member_id] forHTTPHeaderField:@"NewUid"];
    }
    [request setValue:[NSString stringWithFormat:@"%@ %@%@",[[[PhoneUtil alloc] init] getDevice],@"ios",[[UIDevice currentDevice] systemVersion]] forHTTPHeaderField:@"Device"];
    [request setValue:@"shein app" forHTTPHeaderField:@"AppName"];
    [request setValue:@"shein" forHTTPHeaderField:@"AppType"];
    [request setValue:[PhoneUtil getAppVersion] forHTTPHeaderField:@"AppVersion"];
    [request setValue:[FileUtil getCurrency].code forHTTPHeaderField:@"AppCurrency"];
    [request setValue:[PhoneUtil getCountry] forHTTPHeaderField:@"AppCountry"];
    [request setValue:[PhoneUtil getNetWorkStates] forHTTPHeaderField:@"network-type"];
    [request setValue:preferredLang forHTTPHeaderField:@"AppLanguage"];
    
    if([HttpManager sharedManager].meInfo!=nil&&[HttpManager sharedManager].meInfo.token!=nil){
        [request addValue:[HttpManager sharedManager].meInfo.token forHTTPHeaderField:@"token"];
    }
    return request;
}

// 重新加载
- (void)didTryAgain {
    if (self.isTabVC) {
        [self getUrlRequest];
    } else {
        [self.webView reload];
    }
}

// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation {
    [self.indicator startAnimating];
}
// 内容开始加载. 等同于 UIWebViewDelegate: - webViewDidStartLoad:
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation {
//     [self.indicator startAnimating];
}
// 页面加载完成。 等同于 UIWebViewDelegate: - webViewDidFinishLoad:
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {
    [self.indicator stopAnimating];
    [self.loadingView setHidden:YES];
}
// 页面加载失败调用  ---- 好像是网络原因失败
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
    if (self.isTabVC) {
        [self.loadingView showErrorView];
    }
    [self.indicator stopAnimating];
}
// 页面加载失败。 等同于 UIWebViewDelegate: - webView:didFailLoadWithError:
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
    NSLog(@"===============withError");
    [self.indicator stopAnimating];
}
#pragma mark - 交互通用方法 -----------------------
- (void)webToMobile:(NSString *)json {
    NSData *data = [json dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
    if(dict){
        if (![NSThread isMainThread]) {
            return;
        }
        
        NSString *checkMySize = parseStringFromDict(@"checkMySize", dict);
        NSString *link = parseStringFromDict(@"shareLink", dict);
        NSString *popVC = parseStringFromDict(@"popVC", dict);
        if (checkMySize.length > 0) {    //  check my size
            if (self.checkMySizeResult) {
                self.checkMySizeResult(checkMySize);
            }
            [self.navigationController popViewControllerAnimated:YES];
        } else if (link.length > 0) {    // 分享
            [[VAShareTool alloc ] shareInViewConroller:self withTitle:@"" description:@"" url:link imageUrl:link image:nil completionHandler:^(UIActivityType  _Nullable activityType, BOOL completed, NSArray * _Nullable returnedItems, NSError * _Nullable activityError) {
                if (completed) {
                    NSLog(@"completed");
                } else {
                    NSLog(@"cancel");
                }
            }];
        } else if ([popVC isEqualToString:@"1"]) {
            [self.navigationController popViewControllerAnimated:YES];
        }
    }
}
#pragma mark - 交互新增行为方法 -----------------------
- (void)webToMobileAction:(NSString *)json {
    NSData *data = [json dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
    if(dict){
        if ([NSThread isMainThread]) {
            [self pushActionWithDict:dict];
        } else {
            dispatch_async(dispatch_get_main_queue(), ^{
                [self pushActionWithDict:dict];
            });
        }
    }
}
//WKNavigationDelegate
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSString *actionType = navigationAction.request.URL.host;
    
    if([actionType isEqualToString:@"WebBlogVC.shareDownloadYub"]){//分享app
        [GaUtil addMe:@"BACK BLOGGER" label:nil];
        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://m.theyub.com"]];
        NSArray *objectsToShare = @[url];
        UIActivityViewController *controller = [[UIActivityViewController alloc] initWithActivityItems:objectsToShare applicationActivities:nil];
        NSArray *excludedActivities = @[UIActivityTypePrint,
                                        UIActivityTypeCopyToPasteboard,
                                        UIActivityTypeSaveToCameraRoll,
                                        UIActivityTypeAddToReadingList];
        controller.excludedActivityTypes = excludedActivities;
        [self presentViewController:controller animated:YES completion:nil];
    }
    
    
//    if([request.URL.absoluteString isEqualToString:@"about:blank"]&&navigationType==2){//如果是返回，且是空白页面，则从新刷新页面
//        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
//            [self.webView reload];
//        });
//    } else
    
    
    if (self.isTabVC && navigationAction.navigationType == WKNavigationTypeLinkActivated) {
        if (navigationAction.request.URL.absoluteString && ![navigationAction.request.URL.absoluteString containsString:self.url]) {
            UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Setting" bundle:[NSBundle mainBundle]];
            WebViewVC *webVC = [sb instantiateViewControllerWithIdentifier:@"WebViewVC"];
            webVC.url = navigationAction.request.URL.absoluteString;
            [self.navigationController pushViewController:webVC animated:YES];
            decisionHandler(WKNavigationActionPolicyCancel);
            return;
        }
    }
    decisionHandler(WKNavigationActionPolicyAllow);
}
- (void)downloadImageWithUrl:(NSString *)urlStr
{
    NSLog(@"回退----%@",urlStr);
    [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:[urlStr fixUrlSting]] options:SDWebImageRetryFailed progress:^(NSInteger receivedSize, NSInteger expectedSize) {
        
    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
        if (finished && nil != image) {
            //            PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
                if (status == PHAuthorizationStatusRestricted ||
                    status == PHAuthorizationStatusDenied) {
                    //无权限
                    dispatch_async(dispatch_get_main_queue(), ^{
                        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
                    });
                } else{
                    dispatch_async(dispatch_get_main_queue(), ^{
                        UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), (__bridge void *)self);
                    });
                }
            }];
        }
        if (image == nil) {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:[LocalizedUtil getStringByKey:@"string_key_1364"] preferredStyle:UIAlertControllerStyleAlert];
            [alert addAction:[UIAlertAction actionWithTitle:[LocalizedUtil getStringByKey:@"string_key_342"] style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            }]];
            [self presentViewController:alert animated:YES completion:nil];
        }
    }];
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    if (error == nil) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:[LocalizedUtil getStringByKey:@"string_key_1365"] preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:[LocalizedUtil getStringByKey:@"string_key_342"] style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        }]];
        [self presentViewController:alert animated:YES completion:nil];
    } else{
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:getStringByKey(@"string_key_1364") preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:[LocalizedUtil getStringByKey:@"string_key_342"] style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        }]];
        [self presentViewController:alert animated:YES completion:nil];
        
    }
    NSLog(@"image = %@, error = %@, contextInfo = %@", image, error, contextInfo);
}
- (void)sharer:(id<FBSDKSharing>)sharer didCompleteWithResults:(NSDictionary *)results{
    NSLog(@"didCompleteWithResults");
}
- (void)sharer:(id<FBSDKSharing>)sharer didFailWithError:(NSError *)error{
    NSLog(@"didFailWithError,%@",error);
    if(error==nil||[[NSNull null] isEqual:error]){
        [UIToastUtil showToast:self.view message:@"you have not install facebook app."];
    }
}
- (void)sharerDidCancel:(id<FBSDKSharing>)sharer{
    NSLog(@"share...");
}
#pragma mark - 登录 代理 --------------
- (void)loginSuccess:(MeInfo*)meInfo {
   
}
- (void)registSuccess:(MeInfo*)meInfo {
    
}
#pragma mark - 页面跳转 -------------------
- (void)pushActionWithDict:(NSDictionary *)dict {
    NSString *type_id = parseStringFromDict(@"type_id", dict);
    NSString *tid = parseStringFromDict(@"tid", dict);
    NSString *category_type = parseStringFromDict(@"category_type", dict);
    NSString *title = parseStringFromDict(@"title", dict);
    NSString *popVC = parseStringFromDict(@"popVC", dict);
    
    if (type_id.length > 0) {
        if ([type_id isEqualToString:@"1"]) {  //虚拟分类
            UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Promotions" bundle:[NSBundle mainBundle]];
            PromotionGoodsListVC *vc=[sb instantiateViewControllerWithIdentifier:@"PromotionGoodsListVC"];
            vc.virtual_category_id = tid;
            vc.navTitle = title;
            //                vc.siteFrom = @"shop ";
            vc.categoryType = 1;
            [self.navigationController pushViewController:vc animated:YES];
        } else if ([type_id isEqualToString:@"2"]) {  // 真实分类
            if ([category_type isEqualToString:@"1"]) { // 一级分类
                UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Category" bundle:[NSBundle mainBundle]];
                CategoryAllGoodsListVC *vc=[sb instantiateViewControllerWithIdentifier:@"CategoryAllGoodsListVC"];
                vc.navTitle = title;
                vc.category = @"";
                vc.cat_id = tid;
                //                    vc.siteFrom = @"shop ";
                [self.navigationController pushViewController:vc animated:YES];
                
            } else if ([category_type isEqualToString:@"2"]) { // 二级分类
                UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Category" bundle:[NSBundle mainBundle]];
                CategoryGoodsListVC *vc=[sb instantiateViewControllerWithIdentifier:@"CategoryGoodsListVC"];
                vc.navTitle = title;
                vc.category = @"";
                vc.cat_id = tid;
                //                    vc.siteFrom = @"shop ";
                [self.navigationController pushViewController:vc animated:YES];
            }
        } else if ([type_id isEqualToString:@"11"]) { // 跳登录
            UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Login" bundle:[NSBundle mainBundle]];
            LoginVC *vc=[sb instantiateViewControllerWithIdentifier:@"LoginVC"];
            vc.delegate=self;
            [self presentViewController:vc animated:YES completion:NULL];
            if([tid isEqualToString:@"1101"]){ // 登录
                vc.doAction=1;
            } else{ // 注册
                vc.doAction=2;
            }
            [self presentViewController:vc animated:YES completion:NULL];
        } else if ([type_id isEqualToString:@"12"]) { // 商品详情
            GoodsInfo *goodsInfo=[[GoodsInfo alloc] init];
            goodsInfo.goods_id=[tid intValue];
            UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Goods" bundle:[NSBundle mainBundle]];
            GoodsDetailVC *vc=[sb instantiateViewControllerWithIdentifier:@"GoodsDetailVC"];
            vc.goodsInfo=goodsInfo;
            [self.navigationController pushViewController:vc animated:YES];
        }
    } else if (popVC.length > 0) {
        [self.navigationController popViewControllerAnimated:YES];
    }
}

// 设置 WKWebview 滚动速率 需要使用scroll 代理来做  webView.scrollView.delegate = self;  
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;
}

//请求之前，决定是否要跳转:用户点击网页上的链接，需要打开新页面时，将先调用这个方法。 
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler; 

//接收到相应数据后，决定是否跳转 
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler; 

//页面开始加载时调用 
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation; // 主机地址被重定向时调用 - (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation; 

// 页面加载失败时调用 
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error; 

// 当内容开始返回时调用 
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation; 

// 页面加载完毕时调用 
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation; 

//跳转失败时调用 
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error; 

// 如果需要证书验证，与使用AFN进行HTTPS证书验证是一样的 
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *__nullable credential))completionHandler;

 //9.0才能使用，web内容处理中断时会触发
 - (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView NS_AVAILABLE(10_11, 9_0);