iOS下JS与OC互相调用（五）--UIWebView + WebViewJavascriptBridge

    self.webView = [[UIWebView alloc] initWithFrame:self.view.frame];
    [self.view addSubview:self.webView];
    
    NSURL *htmlURL = [[NSBundle mainBundle] URLForResource:@"index.html" withExtension:nil];
    NSURLRequest *request = [NSURLRequest requestWithURL:htmlURL];
    
    // UIWebView 滚动的比较慢，这里设置为正常速度
    self.webView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;
    [self.webView loadRequest:request];

_webViewBridge = [WebViewJavascriptBridge bridgeForWebView:self.webView];
// {setWebViewDelegate}这个方法，可以将UIWebView的代理，从_webViewBridge中再传递出来。
// 所以如果你要在控制器中实现UIWebView的代理方法时，添加下面这样代码，否则可以不写。
[_webViewBridge setWebViewDelegate:self];

+ (instancetype)bridgeForWebView:(WVJB_WEBVIEW_TYPE*)webView {
    WebViewJavascriptBridge* bridge = [[self alloc] init];
    [bridge _platformSpecificSetup:webView];
    return bridge;
}

// 上面方法调用了这个方法
- (void) _platformSpecificSetup:(WVJB_WEBVIEW_TYPE*)webView {
    _webView = webView;
    _webView.delegate = self;
    _base = [[WebViewJavascriptBridgeBase alloc] init];
    _base.delegate = self;
}

#pragma mark - private method
- (void)registerNativeFunctions
{
    [self registScanFunction];
    
    [self registShareFunction];
    
    [self registLocationFunction];
    
    [self regitstBGColorFunction];
    
    [self registPayFunction];
    
    [self registShakeFunction];
}

- (void)registShareFunction
{
    // 所有JS 需要调用的原生功能都要先用registerHandler注册一下
    [_webViewBridge registerHandler:@"shareClick" handler:^(id data, WVJBResponseCallback responseCallback) {
        // data 的类型与 JS中传的参数有关
        NSDictionary *tempDic = data;
        // 在这里执行分享的操作
        NSString *title = [tempDic objectForKey:@"title"];
        NSString *content = [tempDic objectForKey:@"content"];
        NSString *url = [tempDic objectForKey:@"url"];
        
        // 将分享的结果返回到JS中
        NSString *result = [NSString stringWithFormat:@"分享成功:%@,%@,%@",title,content,url];
        responseCallback(result);
    }];
}

function setupWebViewJavascriptBridge(callback) {
    if (window.WebViewJavascriptBridge) { return callback(WebViewJavascriptBridge); }
    if (window.WVJBCallbacks) { return window.WVJBCallbacks.push(callback); }
    window.WVJBCallbacks = [callback];
    var WVJBIframe = document.createElement('iframe');
    WVJBIframe.style.display = 'none';
    WVJBIframe.src = 'wvjbscheme://__BRIDGE_LOADED__';
    document.documentElement.appendChild(WVJBIframe);
    setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
}

function loadURL(url) {
    var iFrame;
    iFrame = document.createElement("iframe");
    iFrame.setAttribute("src", url);
    iFrame.setAttribute("style", "display:none;");
    iFrame.setAttribute("height", "0px");
    iFrame.setAttribute("width", "0px");
    iFrame.setAttribute("frameborder", "0");
    document.body.appendChild(iFrame);
    // 发起请求后这个iFrame就没用了，所以把它从dom上移除掉
    iFrame.parentNode.removeChild(iFrame);
    iFrame = null;
}

setupWebViewJavascriptBridge(function(bridge) {
     bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
        alert('JS方法被调用:'+data);
        responseCallback('js执行过了');
     })
})

function shareClick() {
    var params = {'title':'测试分享的标题','content':'测试分享的内容','url':'http://www.baidu.com'};
    WebViewJavascriptBridge.callHandler('shareClick',params,function(response) {
         alert(response);
        document.getElementById("returnValue").value = response;
     });
}

window.WebViewJavascriptBridge = {
  registerHandler: registerHandler,
  callHandler: callHandler,
  disableJavscriptAlertBoxSafetyTimeout: disableJavscriptAlertBoxSafetyTimeout,
  _fetchQueue: _fetchQueue,
  _handleMessageFromObjC: _handleMessageFromObjC
 };

setupWebViewJavascriptBridge(function(bridge) {
     bridge.registerHandler('testJSFunction', function(data, responseCallback) {
        alert('JS方法被调用:'+data);
        responseCallback('js执行过了');
     })
    // 注册其他的功能
    //bridge.regsiterHandler.....
})

//    // 如果不需要参数，不需要回调，使用这个
//    [_webViewBridge callHandler:@"testJSFunction"];
//    // 如果需要参数，不需要回调，使用这个
//    [_webViewBridge callHandler:@"testJSFunction" data:@"一个字符串"];
    // 如果既需要参数，又需要回调，使用这个
    [_webViewBridge callHandler:@"testJSFunction" data:@"一个字符串" responseCallback:^(id responseData) {
        NSLog(@"调用完JS后的回调：%@",responseData);
    }];

// 这里是Native 调用js ，把参数转换为字符串，执行js 中的_handleMessageFromObjC方法。
- (void)_dispatchMessage:(WVJBMessage*)message {
    NSString *messageJSON = [self _serializeMessage:message pretty:NO];
    [self _log:@"SEND" json:messageJSON];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\\" withString:@"\\\\"];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\'" withString:@"\\\'"];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\n" withString:@"\\n"];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\r" withString:@"\\r"];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\f" withString:@"\\f"];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\u2028" withString:@"\\u2028"];
    messageJSON = [messageJSON stringByReplacingOccurrencesOfString:@"\u2029" withString:@"\\u2029"];
    
    NSString* javascriptCommand = [NSString stringWithFormat:@"WebViewJavascriptBridge._handleMessageFromObjC('%@');", messageJSON];
    if ([[NSThread currentThread] isMainThread]) {
        [self _evaluateJavascript:javascriptCommand];

    } else {
        dispatch_sync(dispatch_get_main_queue(), ^{
            [self _evaluateJavascript:javascriptCommand];
        });
    }
}

var handler = messageHandlers[message.handlerName];
    if (!handler) {
     console.log("WebViewJavascriptBridge: WARNING: no handler for message from ObjC:", message);
    } else {
     handler(message.data, responseCallback);
    }