WKWebView与JS交互
- WKWebView第一种方法
//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;
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 js调OC
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{
NSLog(@"name:%@\\\\n body:%@\\\\n frameInfo:%@\\\\n",message.name,message.body,message.frameInfo);
}
[webView evaluateJavaScript:@"
callJS('这是iOS消息')`" completionHandler:^(id _Nullable item, NSError * _Nullable error) {
NSLog(@"%@",item);
}];`
//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];
- WKWebViewJavascriptBridge (第二种方法)
// js调我
[self.webViewBridge registerHandler:@"jsDiaoOc" handler:^(id data, WVJBResponseCallback responseCallback) {
NSLog(@"js call getUserIdFromObjC, data from js is %@", data);
if (responseCallback) {
// 反馈给JS
responseCallback(@{@"userId": @"1345980"});
}
}];
//调用js方法
[self.webViewBridge callHandler:@"ocDiaoWo" data:@{@"B":@"刘德华"} responseCallback:^(id responseData) {
NSLog(@"js给我的数据: %@", responseData);
}];