WebViewJavascriptBridge是一个第三方开源框架，用于实现原生和JS交互，使用起来非常方便。下面我们一起来学习一下吧。

首先我们导入框架到项目中，采用CocoaPods或者手动导入都可以，我下面使用的是手动导入的方式。

导入框架

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引入头文件

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初始化

@interface ViewController ()

@property (nonatomic, strong) WebViewJavascriptBridge *bridge;

@end

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIWebView *webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:webView];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setTitle:@"客户端调用JS方法：testJavascriptHandler" forState:UIControlStateNormal];
    btn.titleLabel.font = [UIFont systemFontOfSize:12];
    btn.backgroundColor = [UIColor redColor];
    [btn sizeToFit];
    btn.center = self.view.center;
    [btn addTarget:self action:@selector(tapAction:) forControlEvents:UIControlEventTouchUpInside];
    [webView addSubview:btn];
    
    [WebViewJavascriptBridge enableLogging]; //开启日志打印
    self.bridge = [WebViewJavascriptBridge bridgeForWebView:webView]; //绑定webView
    [self.bridge setWebViewDelegate:self]; //设置webView代理
    
    
    /**
     客户端注册方法给JS调用
     */
    [_bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {
        NSLog(@"JS传来的数据: %@", data);
        responseCallback(@{ @"foo":@"我是客户端来的数据😆" });
    }];
    
    NSString *htmlPath = [[NSBundle mainBundle] pathForResource:@"test.html" ofType:@""];
    NSURL *url = [NSURL fileURLWithPath:htmlPath];
    [webView loadRequest:[NSURLRequest requestWithURL:url]];
}
- (void)tapAction:(UIButton *)sender {
    /**
     客户端调用JS注册的方法: testJavascriptHandler
     */
    [_bridge callHandler:@"testJavascriptHandler" data:@{ @"foo":@"before ready" }];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

4.让我们看一下运行效果