iOS UIWebView Javascript - 插入数据 - 接收回调？ [英] iOS UIWebView Javascript - insert data -receive callbacks?

问题描述

我有一个网页。我有一个javascript文件，可以完成很多东西。在应用程序中，我有一个NSString，其中包含一些需要在javascript文件中处理的关键数据。如何将我的字符串值放入我的html中的某个位置，以便我的javascript可以读取它？

I have a webpage. I have a javascript file that does a whole lot of stuff. In the app I have an NSString with some crucial data that needs to be processed in the javascript file. How do I get my string value into a certain place in my html so my javascript can read it?

此外，javascript将在执行操作时产生某些数据（如按下按钮），如何从webview / javascript中检索数据，以便将其存储在应用程序中？

Also, the javascript will produce certain data when actions are performed (like pressing a button), how do I retrieve the data from the webview/javascript so it can be stored in the app?

推荐答案

你可以调用一个javascript方法并使用这个传递值

You can call a javascript method and pass the value by using this

NSString *selectedValue = [webViewInstance stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"getAndReturnRadioValue(%d)", questionCounterIntValue]];

但要从javascript触发，您需要使用变通方法，

But to trigger back from javascript you need to use a workaround method,

实现以下webViewDelegate方法

Implement the following webViewDelegate method

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

    NSLog(@"passed data from web view : %@",[[request URL] query]);

    if([[[request URL] query] isEqualToString:@"clickedOnLineNo"])
    {
        //Do your action here    
    }
}

您必须从javascript方法导航到假URL，

You have to navigate to a fake URL from your javascript method like,

window.location = "someLink://yourApp/form_Submitted:param1:param2:param3";

。

您可以查看我对此问题的回答
提交表格UIWebView

You could take a look at my answer for this question Submit a form in UIWebView

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