iOS ---原生与js交互之JavaScriptcore

1、首先创建一个新类，声明协议，协议遵循<JSExport>协议

#import <Foundation/Foundation.h>
#import <JavaScriptCore/JavaScriptCore.h>

NS_ASSUME_NONNULL_BEGIN

@protocol jsDelegate  <JSExport>

- (void)buy;

@end


@interface JsObject : NSObject
@property (nonatomic, assign) id<jsDelegate>delegate;
@end

2、新类的方法与js的方法名一样，在方法中通过代理调用oc方法

#import "JsObject.h"

@implementation JsObject

- (void)buy {
    if (self.delegate) {
        [self.delegate buy];
    }
}

3、在webview的didfinishload方法中将新类注入到js中

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    JSContext *context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
    JsObject *js = [[JsObject alloc] init];
    js.delegate = self;
    context[@"app"] = js;
}