1、进度条

     //初始化progressView
    self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 64, DEVICE_WIDTH, 1)];
    self.progressView.backgroundColor = BASEColor;
    //设置进度条的高度，下面这句代码表示进度条的宽度变为原来的1倍，高度变为原来的1.5倍.
    self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f);
    [self.view addSubview:self.progressView];
    /*
     *WKWebView有一个属性estimatedProgress，就是当前网页加载的进度，所以监听这个属性。
     */
    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];

#pragma mark - 监听

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    if ([keyPath isEqualToString:@"estimatedProgress"]) {
        self.progressView.progress = self.webView.estimatedProgress;
        if (self.progressView.progress == 1) {
            WeakSelf
            [UIView animateWithDuration:0.25f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{
                weakSelf.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.4f);
            } completion:^(BOOL finished) {
                weakSelf.progressView.hidden = YES;
                
            }];
        }
    }else{
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}
#pragma mark - WKWKNavigationDelegate Methods

//开始加载
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    //开始加载网页时展示出progressView
    self.progressView.hidden = NO;
    //开始加载网页的时候将progressView的Height恢复为1.5倍
    self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f);
    //防止progressView被网页挡住
    [self.view bringSubviewToFront:self.progressView];
}

//加载完成
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    //加载完成后隐藏progressView
    self.progressView.hidden = YES;
}
//加载失败
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {
    //加载失败同样需要隐藏progressView
    self.progressView.hidden = YES;
}

2、自适应

- (WKWebViewConfiguration *)wkConfig {
    if (!_wkConfig) {
        _wkConfig = [[WKWebViewConfiguration alloc] init];
        _wkConfig.allowsInlineMediaPlayback = YES;
        _wkConfig.allowsPictureInPictureMediaPlayback = YES;
        NSString *jSString = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
        WKUserContentController *wkUController = [[WKUserContentController alloc] init];
        WKUserScript *wkUserScript = [[WKUserScript alloc] initWithSource:jSString injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
        // 添加自适应屏幕宽度js调用的方法
        [wkUController addUserScript:wkUserScript];
        _wkConfig.userContentController = wkUController;
    }
    return _wkConfig;
}
//给webview添加属性
    _webView=[[WKWebView alloc]initWithFrame:CGRectMake(0, 0, DEVICE_WIDTH,_isExlink?DEVICE_HEIGHT:DEVICE_HEIGHT-49) configuration:self.wkConfig];

3、清除缓存

- (void)removeWebCache{
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 9.0) {
        NSSet *websiteDataTypes= [NSSet setWithArray:@[
                                                       WKWebsiteDataTypeDiskCache,
                                                       //WKWebsiteDataTypeOfflineWebApplication
                                                       WKWebsiteDataTypeMemoryCache,
                                                       //WKWebsiteDataTypeLocal
                                                       WKWebsiteDataTypeCookies,
                                                       //WKWebsiteDataTypeSessionStorage,
                                                       //WKWebsiteDataTypeIndexedDBDatabases,
                                                       //WKWebsiteDataTypeWebSQLDatabases
                                                       ]];
        
        // All kinds of data
        //NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];
        NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
        [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{
            
        }];
        [[NSURLCache sharedURLCache] removeAllCachedResponses];
        
    } else {
        //先删除cookie
        NSHTTPCookie *cookie;
        NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
        for (cookie in [storage cookies])
        {
            [storage deleteCookie:cookie];
        }
        
        NSString *libraryDir = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        NSString *bundleId  =  [[[NSBundle mainBundle] infoDictionary]
                                objectForKey:@"CFBundleIdentifier"];
        NSString *webkitFolderInLib = [NSString stringWithFormat:@"%@/WebKit",libraryDir];
        NSString *webKitFolderInCaches = [NSString
                                          stringWithFormat:@"%@/Caches/%@/WebKit",libraryDir,bundleId];
        NSString *webKitFolderInCachesfs = [NSString
                                            stringWithFormat:@"%@/Caches/%@/fsCachedData",libraryDir,bundleId];
        NSError *error;
        /* iOS8.0 WebView Cache的存放路径 */
        [[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCaches error:&error];
        [[NSFileManager defaultManager] removeItemAtPath:webkitFolderInLib error:nil];
        /* iOS7.0 WebView Cache的存放路径 */
        [[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCachesfs error:&error];
        NSString *cookiesFolderPath = [libraryDir stringByAppendingString:@"/Cookies"];
        [[NSFileManager defaultManager] removeItemAtPath:cookiesFolderPath error:&error];
        [[NSURLCache sharedURLCache] removeAllCachedResponses];
    }
}