jsbridge与通信模型

三层通信模型：

应用层、解释层、会话层；

通信协议：

通信原语；

报文格式；

网络层：

_evaluateJavascript

会话层：

#define kQueueHasMessage   @"__wvjb_queue_message__"

#define kBridgeLoaded      @"__bridge_loaded__"

表示层：

NSString* responseId = message[@"responseId"];

WVJBResponseCallback responseCallback = _responseCallbacks[responseId];

应用层：

[_bridge callHandler:@"testJavascriptHandler" data:data responseCallback:^(id response) {

NSLog(@"testJavascriptHandler responded: %@", response);

}];

通信机制：

1、js发送消息

sendMessageQueue.push(message);

messagingIframe.src = CUSTOM_PROTOCOL_SCHEME + '://' + QUEUE_HAS_MESSAGE;

2、oc端接收消息

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType

NSString *messageQueueString = [self _evaluateJavascript:[_base webViewJavascriptFetchQueyCommand]];

[_base flushMessageQueue:messageQueueString];

3、oc端消息处理：

WVJBHandler handler = self.messageHandlers[message[@"handlerName"]];

handler(message[@"data"], responseCallback);

构建返回报文并返回：

NSString* callbackId = message[@"callbackId"];

if (callbackId) {

responseCallback = ^(id responseData) {

if (responseData == nil) {

responseData = [NSNull null];

}

WVJBMessage* msg = @{ @"responseId":callbackId, @"responseData":responseData };

[self _queueMessage:msg];

};

}

4、oc端发送消息

NSString* javascriptCommand = [NSString stringWithFormat:@"WebViewJavascriptBridge._handleMessageFromObjC('%@');", messageJSON];

[self _evaluateJavascript:javascriptCommand];

通信原语：通信控制

#define kOldProtocolScheme @"wvjbscheme"

#define kNewProtocolScheme @"https"

#define kQueueHasMessage   @"__wvjb_queue_message__"

#define kBridgeLoaded      @"__bridge_loaded__"

https://__bridge_loaded__/

https://__wvjb_queue_message__/

通信报文：

{

callbackId = "cb_1_1560136340114";

data =     {

foo = bar;

};

handlerName = testObjcCallback;

}

会话维护：

callbackId

responseId

应用协议：

handlerName

生命周期管理

https://__bridge_loaded__/