About JS calling OC

First: To import in the project

Javascriptcore.framework

In the WebView controller. H Reference

#import <JavaScriptCore/JavaScriptCore.h>

Then: we can

-(void) Webviewdidfinishload: (uiwebview *) WebView method

Pass

Jscontext *context = [WebView valueforkeypath:@ "DocumentView.webView.mainFrame.javaScriptContext"];

Gets a Jscontext object

This object I understand as JS's control center

Now there are two ways to make JS call our own method

1. Assign a block method to a context object directly:

context[@ "block"] = ^ (parameter) {};

JS can be called directly:

Block (parameter)

2. Assign the Self object of the WebView controller to a sub-class of the context object:

context[@ "Zhaozhi"] = self;

This way JS can be called through the object method, but to write a protocol in. h, the method is written in:

@protocol Webviewjsexport <jsexport>

-(void) Gotoexplosiondetail: (nsstring *) message;

@end

The controller complies with this Protocol

JS can call this method, the calling code:

Zhaozhi.method (* * *);

About JS calling OC