WKWebView与Js交互

首先打开webstorm，将最下面h5拷贝到html中。然后导入工程

#define kMessageHandlerName @"mymobile"

1.创建配置类

- (WKWebView *)webView{
if (!_webView) {

WKWebViewConfiguration *config =[[WKWebViewConfiguration alloc]init];

config.preferences.javaScriptEnabled = YES;
/** 默认是不能通过JS自动打开窗口的，必须通过用户交互才能打开 */
config.preferences.javaScriptCanOpenWindowsAutomatically = YES;
_webView = [[WKWebView alloc]initWithFrame:self.view.bounds configuration:config];

_webView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

_webView.allowsBackForwardNavigationGestures = YES;//打开左划回退功能
_webView.navigationDelegate = self;
_webView.UIDelegate = self;
_webView.backgroundColor = [UIColor whiteColor];
[self.view addSubview:_webView];

}

return _webView;

}

2.加载H5页面

NSURL *path = [[NSBundle mainBundle] URLForResource:@"index" withExtension:@"html"];
[self.webView loadRequest:[NSURLRequest requestWithURL:path]];

3 注入对象名称 kMessageHandlerName

- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:kMessageHandlerName];
}

- (void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:kMessageHandlerName];
}

/**代理方法
JS通过mymobile发送数据到iOS端时，在代理中接收
var message = {"method":"call","args":"let go"};
window.webkit.messageHandlers.mymobile(注:这里是注入的对象名).postMessage(message);
*/
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{

NSDictionary *dic = message.body;

NSString *method = dic[@"method"];

if ([method isEqualToString:@"call"]) {

[self call];
}

NSLog(@"dic = %@", dic);
}

- (void)call{

UIAlertController *sheet = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[sheet addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
//调用js
NSString *js = [NSString stringWithFormat:@"gotoCall()"];
[self.webView evaluateJavaScript:js completionHandler:nil];

}]];

[sheet addAction:[UIAlertAction actionWithTitle:@"不要点我" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}]];
[sheet addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
[self presentViewController:sheet animated:YES completion:nil];

}

/** 在JS端调用alert函数时，会触发此代理方法（确认框） */

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{

UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:UIAlertControllerStyleAlert];
[alertVC addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil]];
[self presentViewController:alertVC animated:YES completion:nil];

completionHandler();
}

<body>

<p></p>

call.onclick = function() {
var message = {"method":"call","args":"let go"};
window.webkit.messageHandlers.mymobile.postMessage(message);
};

function gotoCall(){
alert('调用了OC中的alert')
}

</script>

</body>

</html>

WKWebView与Js交互

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