Objective-C和JavaScript交互的那些事

二、    IOS上的代码对接

   注意点：#import 需放在.h文件中

#import"ViewController.h"
#import
@interfaceViewController ()@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
}

三、    Android代码上的交互     

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
        }
    });
 }

上面是我整理给大家的js和app交互的方式，希望今后会对大家有帮助。

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