1、 WebView解决跨域问题
// 解决跨域问题：h5 无法读取沙盒图片
[self.myWebView.configuration.preferences setValue:@YES forKey:@"allowFileAccessFromFileURLs"];
[self.myWebView.configuration.userContentController addScriptMessageHandler:weakSelf name:@"go_apppic"];
2、html 示例
<!DOCTYPE html>
<html>
<header>
<title id = "title">Title of this page</title>
<!--样式从File.css文件中获取-->
<link rel="stylesheet" type="text/css" href="File.css">
<!--样式改变适应手机屏幕大小-->
<meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<!--响应的方法从File.js文件中获取-->
<!--<script type="text/javascript" src="File.js"></script>-->
</header>
<body>
<button type="button" onclick = "JSCallOCMethod1()">JSCallOCMethod1</button>
<br/><br/>
<image id='img' width='200' height='300' src='https://picsum.photos/200/300'>
<script type="text/javascript">
function JSCallOCMethod1() {
console.log('JSCallOCMethod1');
window.webkit.messageHandlers.go_apppic.postMessage({"funkey":"funkey"});
}
function go_apppic_back(funk, jsonString){
console.log(jsonString);
let jsonStr = decodeURI(jsonString);
let res = JSON.parse(jsonStr);
console.log(res);
let values = Object.values(res)
console.log(values[0]);
document.getElementById('img').src = values[0];
}
</script>
</body>
</html>
3、回调JS
NSString *jsStr = [NSString stringWithFormat:@"%@('%@', '%@')",@“ go_apppic_back”, @“”,@“”];
[self.myWebView evaluateJavaScript:jsStr completionHandler:^(id _Nullable res, NSError * _Nullable error) {
}];
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