iOS 和 H5 交互那些事 (UIWebView、WKWeb

作者: 陈雨尘 | 来源:发表于2017-07-18 17:03 被阅读348次

    1.OC与JS交互之UIWebView

    创建一个UIWebView 并加载
      _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height-20)];
      _webView.delegate = self;
      _webView.scrollView.bounces = NO;   
      / 添加 webiview
    [self.view addSubview:self.webView];
    // 加载请求
    // 1.URL
    NSURL *url = [NSURL URLWithString:HOME_URL];
    // 2.创建请求
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    // 3.加载请求
    [self.webView loadRequest:request];
    
    UIWebView delegate 协议方法
       //网页即将开始加载
     - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
    
      //网页开始加载
     - (void)webViewDidStartLoad:(UIWebView *)webView;
    
      //网页加载完成
      - (void)webViewDidFinishLoad:(UIWebView *)webView;
    
      //网页加载失败
      - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;
       //UIWebView自带了一个方法, 可以直接调用JS代码(转化为string类型的js代码)
       - (nullable NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;
    
       //例如修改id为‘html’标签内部的text属性
       [web stringByEvaluatingJavaScriptFromString:@"document.getElementById('html').innerText='修改内容'"];
    
         //也可以执行多行js代码
     [web stringByEvaluatingJavaScriptFromString:@"var div = document.getElementById('html'); div.innerText = '修改内容'"];
    

    // JS调用OC

    一,js里面直接调用方法

    方法1

    1.png

    代码如下

      - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSLog(@"%@",request.URL );
    if ([[request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/stats/index?orgId=",PR_AppDotNetAPIBaseURLString]]) {
        [self menuLeftBarButton];
    } else {
        [self setDefaultBackButton];
        [self setRightButton];
    }
    
        return YES;
    }
    

    在这个网页即将加载的方法里面做一些网址的截取,可以做一些相应的处理,对某些特定的网址做不同的处理。至于返回YES 还是NO 就根据你们的需求做处理

    方法2

    2.png

    在网页加载完成之后使用苹果推荐的JavaScriptCore

    2.png

    对于有参数传递的也是有两种方法获取,详细见图

    4.png

    代码如下

        - (void)webViewDidFinishLoad:(UIWebView *)webView
      {
             if ([[webView.request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/stats/index?orgId=",PR_AppDotNetAPIBaseURLString]]) {
          self.title = @"我的机构";
     } else {
         self.title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
    }
          if ([[webView.request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/newstats/hot/",PR_AppDotNetAPIBaseURLString]]) {
           [self touchToDetail];
    }
           [self invokeJS];
     }
          - (void)invokeJS {
    JSContext *context = [self.webView  valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
    
    context[@"orgBuyCoin"] = ^() {
        BuyCoinViewController *vc = [[BuyCoinViewController alloc] initWithNibName:@"BuyCoinViewController" bundle:nil];
        vc.whicePay = @"BCPay";
        vc.productType = @"4";
        vc.title = @"机构购买学币";
        [self.navigationController pushViewController:vc animated:YES];
    };
    
    context[@"buyMembers"] = ^() {
       NSNumber *MemberCount = [[NSNumber alloc] init];
        NSArray *args = [JSContext currentArguments];
        MemberCount = (NSNumber *)args[0];
        JSValue *this = [JSContext currentThis];
        NSLog(@"this8888888888888: %@",this);
        NSLog(@"-------End Log-------");
        
        BuyMembersViewController *vc = [[BuyMembersViewController alloc] initWithNibName:@"BuyMembersViewController" bundle:nil];
        //返回的
        NSLog(@"-----MemberCount:%@", MemberCount);
        vc.MemberCount = MemberCount;
        [self.navigationController pushViewController:vc animated:YES];
    };
    }
    

    二,js里面通过对象调用方法 这里以微信和支付宝支付为例子
    这里要借助 JSExport
    可以制定一个协议

     @protocol JSLivingDelegate <JSExport>
    /**
      * 支付宝支付
      *
      * @param ali_pay_data 支付数据
      * @param ali_order 订单
     */
    JSExportAs(ali_pay,
     - (void)ali_sub:(id)ali_pay_data order:(id)ali_order
       );
       //微信支付
     JSExportAs(wx_pay,
     - (void)wxpay_sub:(NSString *)appId
        nonceStr:(NSString *)nonceStr
        outTradeNo:(NSString *)outTradeNo
        package:(NSString *)package
        partnerid:(NSString *)partnerid
        paySign:(NSString *)paySign
        prepayid:(NSString *)prepayid
        signTyp:(NSString *)signTyp
        timeStamp:(NSString *)timeStamp
      );
     @end
      遵循协议实现对应的OC方法就行了
    

    //OC调用JS

    方法1

    5.png

    代码如下
    iOS 7之前
    [self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"addressCallBack('%@','%@','%@','%@');",provincecid,province,citycid,city]];

    方法2

      NSString * method = @"dolike";
      JSValue * function = [self.context objectForKeyedSubscript:method];
     //这里面的a,b,c就是OC调用JS的时候给JS传的参数
      [function callWithArguments:@[a,b,c]];
    

    2.OC与JS交互之WKWebView

    创建一个WKWebView 并加载
    self.webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 20, kScreenWidth, kScreenHeight-20) configuration:config];
    self.webView.scrollView.bounces = NO;
    self.webView.UIDelegate = self;
    self.webView.navigationDelegate = self;
    NSURL *url = [NSURL URLWithString:string];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [self.webView loadRequest:request];
    
    WKWebView中的三个代理方法

    1 WKNavigationDelegate

    // 页面开始加载时调用
    - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;
    // 当内容开始返回时调用
    - (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;
       // 页面加载完成之后调用
    - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;
        // 页面加载失败时调用
    - (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;
    
     页面跳转的代理方法有三种,分为(收到跳转与决定是否跳转两种)
    
     // 接收到服务器跳转请求之后调用
    - (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:   (WKNavigation *)navigation;
      // 在收到响应后,决定是否跳转
    - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
        // 在发送请求之前,决定是否跳转
    - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction  *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
    

    2 WKUIDelegate

    -(WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;
      / 界面弹出警告框
    - (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(void (^)())completionHandler;
    // 界面弹出确认框
    - (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;
    // 界面弹出输入框
    - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler;
    

    3 WKScriptMessageHandler

     - (void)userContentController:(WKUserContentController *)userContentController 
     didReceiveScriptMessage:(WKScriptMessage *)message;
    

    //JS调用OC

    也可以截取网址这里就不在累述
    在创建web的时候 self.webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 20, kScreenWidth, kScreenHeight-20) configuration:config];
    配置 config 对js 的方法进行类似注册的操作

        WKWebViewConfiguration *config = [WKWebViewConfiguration new];
        //初始化偏好设置属性:preferences
       config.preferences = [WKPreferences new];
        //The minimum font size in points default is 0;
       config.preferences.minimumFontSize = 10;
        //是否支持JavaScript
       config.preferences.javaScriptEnabled = YES;
        //不通过用户交互,是否可以打开窗口
       config.preferences.javaScriptCanOpenWindowsAutomatically = NO;
       [config.userContentController addScriptMessageHandler:self name:@"AppModel"];
       [config.userContentController addScriptMessageHandler:self name:@"ConfirmAccepts"];
        [config.userContentController addScriptMessageHandler:self name:@"ChuanPhone"];
    

    然后在代理做对应的处理和参数的接收

      - (void)userContentController:(WKUserContentController *)userContentController 
         didReceiveScriptMessage:(WKScriptMessage *)message {
          NSLog(@"%@",NSStringFromSelector(_cmd));
         NSLog(@"%@",message.body);
    
        if ([message.name isEqualToString:@"AppModel"]) {
        [self showMsg:@"我收到js的AppModel"];
    }
     
       if ([message.name isEqualToString:@"ConfirmAccepts"]) {
        NSString *info = [NSString stringWithFormat:@"你好 %@, 很高兴见到你",message.body];
        [self showMsg:info];
    }
     
        if ([message.name isEqualToString:@"ChuanPhone"]) {
        NSArray *array = message.body;
        NSString *info = [NSString stringWithFormat:@"这是我的手机号: %@, %@ !!",array.firstObject,array.lastObject];
        [self showMsg:info];
      }
     }
    

    //OC 调用JS

      //方法 setName
      [webView evaluateJavaScript:@"setname('张三')" completionHandler:nil];
     //此处 setname为JS定义的方法名, 内部 ‘张三’为传给JS的参数。 如果setname方法需要传入一个json或者array等非字符参数, 需要用format方法将其转为string类型,在调用evaluate方法。例如
      NSString * para = [NSString stringWithFormat:@"setname('%@')",json];
    

    希望能够帮助你,有什么问题欢迎留言。

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