1、在WKWebview初始化的时候，先注册JS方法
//这个类主要用来做native与JavaScript的交互管理
WKUserContentController * wkUController = [[WKUserContentController alloc] init]
//注册一个name为jsToOcNoPrams的js方法，设置处理接收JS方法的代理
[wkUController addScriptMessageHandler:self name:@"jsToOcNoPrams"]
[wkUController addScriptMessageHandler:self name:@"jsToOcWithPrams"]
config.userContentController = wkUController
2、拦截js方法，接收参数
注意：遵守WKScriptMessageHandler协议，代理是由WKUserContentControl设置
//通过接收JS传出消息的name进行捕捉的回调方法
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{
NSLog(@"name:%@\\\\n body:%@\\\\n frameInfo:%@\\\\n",message.name,message.body,message.frameInfo)
//用message.body获得JS传出的参数体
NSDictionary * parameter = message.body
//JS调用OC
if([message.name isEqualToString:@"jsToOcNoPrams"]){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"js调用到了oc" message:@"不带参数" preferredStyle:UIAlertControllerStyleAlert]
[alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}])]
[self presentViewController:alertController animated:YES completion:nil]
}else if([message.name isEqualToString:@"jsToOcWithPrams"]){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"js调用到了oc" message:parameter[@"params"] preferredStyle:UIAlertControllerStyleAlert]
[alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}])]
[self presentViewController:alertController animated:YES completion:nil]
}
}
3、在webview释放注销之前移除js方法
//移除注册的js方法
[[_webView configuration].userContentController removeScriptMessageHandlerForName:@"jsToOcNoPrams"]
二、oc调用H5，给H5传值
1、//OC调用JS changeColor()是JS方法名，completionHandler是异步回调block
NSString *jsString = [NSString stringWithFormat:@"changeColor('%@')", @"Js参数"]
[_webView evaluateJavaScript:jsString completionHandler:^(id _Nullable data, NSError * _Nullable error) {
NSLog(@"改变HTML的背景色")
}]
//改变字体大小 调用原生JS方法
NSString *jsFont = [NSString stringWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'", arc4random()%99 + 100]
[_webView evaluateJavaScript:jsFont completionHandler:nil]
2、// 页面加载完成之后调用
- (void)webView:(WKWebView*)webView didFinishNavigation:(WKNavigation*)navigation{
[SVProgressHUDdismiss]
NSString* jsStr = [NSStringstringWithFormat:@"payResult('%@')",@"true"]
[self.webView evaluateJavaScript:jsStrcompletionHandler:^(id_Nullable result,NSError* _Nullable error) {
NSLog(@"==%@----%@",result, error)
}]
}
实现的原理很简单，就是借助客户端webview的WebViewJavascriptBridge对象的callHandler方法和registerHandler方法进行数据传输，其中callHander用于js调用客户端的方法，registerHandler用于调用客户端调用js的方法，具体实现方法如下:
