iOS WKWebview的使用

创建WKWebview

创建 WKWebViewConfiguration对象

   WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
        config.allowsInlineMediaPlayback = YES; //是否允许内联播放(YES)或使用本机全屏控制器(NO)，默认是NO。
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创建wkwebview

///使用config 创建webview
        _webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
        _webView.backgroundColor = [UIColor clearColor];
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设置代理

    ///设置代理
    _webView.UIDelegate = self;
    _webView.navigationDelegate = self;
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添加js 和native 交互

   WKUserContentController *contentController = self.webView.configuration.userContentController;
   [contentController addScriptMessageHandler:self name:@"thepaperNewsClicked"];
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注入js

        NSString *jSString = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
        //用于进行JavaScript注入
        WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jSString injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
        [config.userContentController addUserScript:wkUScript];
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展示内容

展示本地资源

        NSString *path = [[NSBundle mainBundle] pathForResource:@"JStoOC.html" ofType:nil];
        NSString *htmlString = [[NSString alloc]initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
        [_webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
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使用url 展示

      NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:self.urlString]];
        [self.webView loadRequest:request];
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实现 协议

WKNavigationDelegate ：主要处理一些跳转、加载处理操作

-(void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
/// 网页开始加载
}
    // 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
}
    
-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
/// 网页加载完成
}

-(void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {
 /提交发生错误时调用
}

    // 根据WebView对于即将跳转的url相关信息来决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSString * urlStr = navigationAction.request.URL.absoluteString;
    NSLog(@"发送跳转请求：%@",urlStr);
    //自己定义的协议头
    NSString *htmlHeadString = @"baidu://";
    if([urlStr hasPrefix:htmlHeadString]){
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"通过截取URL调用OC" message:@"你想前百度主页?" preferredStyle:UIAlertControllerStyleAlert];
        [alertController addAction:([UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {   
        }])];
        [alertController addAction:([UIAlertAction actionWithTitle:@"打开" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            NSURL * url = [NSURL URLWithString:[urlStr stringByReplacingOccurrencesOfString:@"github://callName_?" withString:@""]];
            [[UIApplication sharedApplication] openURL:url];
        }])];
        [self presentViewController:alertController animated:YES completion:nil];
        decisionHandler(WKNavigationActionPolicyCancel);
    }else{
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

    // 根据客户端受到的服务器响应头以及response相关信息来决定是否可以跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
    NSString * urlStr = navigationResponse.response.URL.absoluteString;
    NSLog(@"当前跳转地址：%@",urlStr);
    //允许跳转
    decisionHandler(WKNavigationResponsePolicyAllow);
    //不允许跳转
    //decisionHandler(WKNavigationResponsePolicyCancel);
} 
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error{
  /// 网页加载失败
}

   // 接收到服务器跳转请求即服务重定向时之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {
}
-(WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {
    [webView loadRequest:navigationAction.request];
    return nil;
}

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WKUIDelegate ：主要处理JS脚本，确认框，警告框等

 /**
     *  web界面中有弹出警告框时调用
     *
     *  @param webView           实现该代理的webview
     *  @param message           警告框中的内容
     *  @param completionHandler 警告框消失调用
     */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"HTML的弹出框" message:message?:@"" preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler();
    }])];
    [self presentViewController:alertController animated:YES completion:nil];
}
    // 确认框
    //JavaScript调用confirm方法后回调的方法 confirm是js中的确定框，需要在block中把用户选择的情况传递进去
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:message?:@"" preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:([UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        completionHandler(NO);
    }])];
    [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler(YES);
    }])];
    [self presentViewController:alertController animated:YES completion:nil];
}
    // 输入框
    //JavaScript调用prompt方法后回调的方法 prompt是js中的输入框 需要在block中把用户输入的信息传入
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable))completionHandler{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:prompt message:@"" preferredStyle:UIAlertControllerStyleAlert];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.text = defaultText;
    }];
    [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler(alertController.textFields[0].text?:@"");
    }])];
    [self presentViewController:alertController animated:YES completion:nil];
}
    // 页面是弹出窗口 _blank 处理
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {
    if (!navigationAction.targetFrame.isMainFrame) {
        [webView loadRequest:navigationAction.request];
    }
    return nil;
}

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WKScriptMessageHandler

/*wkwebview的JS事件处理, 注意，这里的name 需要和
前面   [contentController addScriptMessageHandler:self name:@"thepaperNewsClicked"]
中的name 相同
*/
-(void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    if ([message.name isEqualToString:@"thepaperNewsClicked"]) {
      ]; }
      }
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oc 调用js 方法

直接调用js 向原生发送消息

   NSString *data = @"{'name' : 'showSkuDialog', 'data' : { 'virtual_goods_id' : '26011982'}}";
    NSString *js = [NSString stringWithFormat:@"window.webkit.messageHandlers.TXWVAPI.postMessage(%@)",data];
    [self.webView evaluateJavaScript:js completionHandler:^(id _Nullable value, NSError * _Nullable error) {
        
    }];

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调用js中的具体方法

    [self.contentHybridHandler.webView evaluateJavaScript:[NSString stringWithFormat:@"webOnChange(%@)",name,jsonString] completionHandler:^(id _Nullable obj, NSError * _Nullable error) {
        
    }];
    
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js代码

function webOnload(e) {
    e && e.votedList && e.allVoteInfo && (initUserVote(e.votedList, e.allVoteInfo), setTimeout(function() {
        sendWebHeight()
    }, 500)),
    imgFactory(function() {
        loadTimeLine(),
        sendWebHeight(),
        initGallery(),
        askip(),
        setTimeout(function() {
            LinkApp.initPage(),
            TimeLine()
        }, 200),
        showimg.initshowimg(),
        votePK(),
        ordinaryVote()
    })
}
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进行系统操作

如写入cookie

   NSString *JSFuncString =
    @"function setCookie(name,value,expires)\
    {\
    var oDate=new Date();\
    oDate.setDate(oDate.getDate()+expires);\
    document.cookie=name+'='+value+';expires='+oDate+';path=/'\
    }\
    function getCookie(name)\
    {\
    var arr = document.cookie.match(new RegExp('(^| )'+name+'=([^;]*)(;|$)'));\
    if(arr != null) return unescape(arr[2]); return null;\
    }\
    function delCookie(name)\
    {\
    var exp = new Date();\
    exp.setTime(exp.getTime() - 1);\
    var cval=getCookie(name);\
    if(cval!=null) document.cookie= name + '='+cval+';expires='+exp.toGMTString();\
    }";
    
    //拼凑js字符串
    NSMutableString *JSCookieString = JSFuncString.mutableCopy;
    for (NSHTTPCookie *cookie in cookieStorage.cookies) {
        NSString *excuteJSString = [NSString stringWithFormat:@"setCookie('%@', '%@', 1);", cookie.name, cookie.value];
        [JSCookieString appendString:excuteJSString];
    }
    //执行js
    [_webView evaluateJavaScript:JSCookieString completionHandler:nil];
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改变字体大小

    //改变字体大小 调用原生JS方法
    NSString *jsFont = [NSString stringWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'", arc4random()%99 + 100];
    [_webView evaluateJavaScript:jsFont completionHandler:nil];
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监听网页加载进度

使用 estimatedProgress监听网页加载进度

    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];

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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
    if ([keyPath isEqualToString:@"estimatedProgress"]) {
        if (self.webView.estimatedProgress == 1) {
            self.webView.hidden = NO;
            [self stopLoading];
        }
    } else  {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}


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