Home > Article > Web Front-end > Explain in detail how JS interacts with the app (code attached)
The following is the method of interaction between JS and app that I have compiled for you. Interested students can take a look.
1. Interconnection of code on H5
Key points: 1. Parameter passing of Object type, 2. The same JS method that interacts with the app, 3. Script method It needs to be embedded in the head.
<html> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <script type="text/javascript"> var share = JSON.stringify({"title":"Migi000", "desc":"简书", "shareUrl":"http://www.jianshu.com/p/f896d73c670a" }); //IOS function startFunction(share){ window.android.startFunction(share)//android } </script> <script> // testFunction() </script> <divonClick="testFunction()">dffddjjjjlj;ljlhhnljkhljhkjf</div> <divid="app-root"></div> <script type="text/javascript"src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script> <script> var _hmt = _hmt || [];(function() {var hm= document.createElement("script");hm.src ="//hm.baidu.com/hm.js?f84dde8c08e5b9c97f9c39e2fcb4d658";var s =document.getElementsByTagName("script")[0];s.parentNode.insertBefore(hm, s);})(); </script> <scripttype="text/javascript"> 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; } function testFunction(share) { loadURL("testfunction://?title=分享的标题&content=分享的内容&url=链接地址&imagePath=图片地址"); } var share =JSON.stringify({"title": "分享的标题","content":"分享的内容","url":"http://www.jianshu.com/p/f896d73c670a"}); testFunction(share) </script> </head> <body> <br/> <h1>Objective-C和JavaScript交互的那些事 </h1> <br/> <input type="button" value="Share" onClick="startFunction(share)" >点击调用原生代码并传递参数</a> </body> </html>
2. Code docking on IOS
Note: #importdcbd4dc34be872dd53e0bb4d60d07d16 needs to be placed in a .h file
#import"ViewController.h" #import<JavaScriptCore/JavaScriptCore.h> @interfaceViewController ()<UIWebViewDelegate>@property (nonatomic)UIWebView*webView; @property(nonatomic)JSContext *jsContext; @property(nonnull,strong) UIButton *btn; @end @implementationViewController -(void)viewDidLoad{ [super viewDidLoad]; self.webView = [[UIWebViewalloc]initWithFrame:self.view.bounds]; self.webView.delegate = self; [self.view addSubview:_webView]; NSString *str = [[NSBundle mainBundle]pathForResource:@"migi" ofType:@"html"]; [self.webView loadRequest:[NSURLRequestrequestWithURL:[NSURL fileURLWithPath:@"f"]]]; // 在上面添加一个按钮,实现oc端控制h5实现弹alert方法框 self.btn = [[UIButton alloc]initWithFrame:CGRectMake(100,400,100, 40)]; self.btn.backgroundColor = [UIColorredColor]; [self.btn addTarget:selfaction:@selector(showAlert) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:self.btn]; } -(void)showAlert { //要将script的alert()方法转化为string类型 NSString *alertJs=@"alert('Hello Word')"; [_jsContext evaluateScript:alertJs]; } -(void)webViewDidFinishLoad:(UIWebView*)webView{ _jsContext = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"]; _jsContext[@"startFunction"] =^(id obj){ ////这里通过block回调从而获得h5传来的json数据 /*block中捕获JSContexts 我们知道block会默认强引用它所捕获的对象,如下代码所示,如果block中直接使用context也会造成循环引用,这使用我们最好采用[JSContext currentContext]来获取当前的JSContext: */ [JSContext currentContext]; NSData *data = [(NSString *)objdataUsingEncoding:NSUTF8StringEncoding ]; NSDictionary *dict =[NSJSONSerialization JSONObjectWithData:dataoptions:NSJSONReadingMutableContainers error:nil]; NSLog(@"data %@ ====== ShareUrl %@",obj,dict[@"shareUrl"]); }; // _jsContext.exceptionHandler = ^(JSContext*context, JSValue *exceptionValue) { context.exception = exceptionValue; //比如把js中的方法名改掉,OC找不到相应方法,这里就会打印异常信息 NSLog(@"异常信息:%@", exceptionValue); }; _jsContext[@"testFunction"] =^(id obj){ //这里通过block回调从而获得h5传来的json数据 [JSContext currentContext]; NSData *data = [(NSString *)objdataUsingEncoding:NSUTF8StringEncoding ]; NSDictionary *dict = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil]; // NSLog(@" data %@ ====== ShareUrl%@",obj,dict[@"shareUrl"]); UIAlertView *alertView = [[UIAlertViewalloc] initWithTitle:dict[@"title"]message:dict[@"content"]delegate:nilcancelButtonTitle:@"cancel"otherButtonTitles:nil,nil]; [alertView show]; }; } -(BOOL)webView:(UIWebView *)webViewshouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSURL * url = [requestURL]; //NSLog(@"scheme信息:%@", [urlscheme]); if ([[url scheme] isEqualToString:@"testfunction"]) { NSArray *params =[url.querycomponentsSeparatedByString:@"&"]; NSMutableDictionary *tempDic = [NSMutableDictionarydictionary]; for (NSString *paramStrin params) { NSArray *dicArray = [paramStrcomponentsSeparatedByString:@"="]; if (dicArray.count >1) { NSString *decodeValue =[dicArray[1]stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; [tempDic setObject:decodeValueforKey:dicArray[0]]; } } UIAlertView *alertView = [[UIAlertViewalloc] initWithTitle:tempDic[@"title"]message:tempDic[@"content"]delegate:selfcancelButtonTitle:@"收到"otherButtonTitles:nil]; [alertView show]; NSLog(@"tempDic:%@",tempDic); return NO; } return true; //为yes加载内容,否则不 }
3. Android code Interaction on
mWebH5.addJavascriptInterface(new MyJavaScriptInterface(this), "android"); mWebH5.setWebViewClient(new WebViewClient() { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { //返回值是true的时候控制去WebView打开,为false调用系统浏览器或第三方浏览器 view.loadUrl(url); return true; } });
@JavascriptInterface publicvoid startFunction(String json){ if(SharedPrefs.getInstance().getUserAccessToken()==null){ Gson gson=new Gson(); finalShareLinkBean shareLinkBean =gson.fromJson(json, ShareLinkBean.class); LogUtils.i("test",json); mActivity.runOnUiThread(new Runnable() { @Override publicvoid run() { //跑相关逻辑 } }); }
The above is the method of interaction between JS and app that I compiled for everyone. I hope it will be helpful to everyone in the future.
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