Explain in detail how JS interacts with the app (code attached)
The following is the method of interaction between JS and app that I have compiled for you. Interested students can take a look.
1. Interconnection of code on H5
Key points: 1. Parameter passing of Object type, 2. The same JS method that interacts with the app, 3. Script method It needs to be embedded in the head.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<script type="text/javascript">
var share = JSON.stringify({"title":"Migi000",
"desc":"简书",
"shareUrl":"http://www.jianshu.com/p/f896d73c670a"
});
//IOS
function startFunction(share){
window.android.startFunction(share)//android
}
</script>
<script>
// testFunction()
</script>
<divonClick="testFunction()">dffddjjjjlj;ljlhhnljkhljhkjf</div>
<divid="app-root"></div>
<script type="text/javascript"src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<script>
var _hmt = _hmt || [];(function() {var hm= document.createElement("script");hm.src ="//hm.baidu.com/hm.js?f84dde8c08e5b9c97f9c39e2fcb4d658";var s =document.getElementsByTagName("script")[0];s.parentNode.insertBefore(hm, s);})();
</script>
<scripttype="text/javascript">
function loadURL(url)
{
var iFrame;
iFrame =document.createElement("iframe");
iFrame.setAttribute("src", url);
iFrame.setAttribute("style","display:none;");
iFrame.setAttribute("height", "0px");
iFrame.setAttribute("width", "0px");
iFrame.setAttribute("frameborder", "0");
document.body.appendChild(iFrame);
// 发起请求后这个iFrame就没用了，所以把它从 dom上移除掉
iFrame.parentNode.removeChild(iFrame);
iFrame = null;
}
function testFunction(share)
{
loadURL("testfunction://?title=分享的标题&content=分享的内容&url=链接地址&imagePath=图片地址");
}
var share =JSON.stringify({"title": "分享的标题","content":"分享的内容","url":"http://www.jianshu.com/p/f896d73c670a"});
testFunction(share) </script>
</head>
<body>
<br/>
<h1>Objective-C和JavaScript交互的那些事 </h1>
<br/>
<input type="button" value="Share" onClick="startFunction(share)" >点击调用原生代码并传递参数</a>
</body>
</html>2. Code docking on IOS
Note: #import
#import"ViewController.h"
#import<JavaScriptCore/JavaScriptCore.h>
@interfaceViewController ()<UIWebViewDelegate>@property (nonatomic)UIWebView*webView;
@property(nonatomic)JSContext *jsContext;
@property(nonnull,strong) UIButton *btn;
@end
@implementationViewController
-(void)viewDidLoad{
[super viewDidLoad];
self.webView = [[UIWebViewalloc]initWithFrame:self.view.bounds];
self.webView.delegate = self;
[self.view addSubview:_webView];
NSString *str = [[NSBundle mainBundle]pathForResource:@"migi" ofType:@"html"];
[self.webView loadRequest:[NSURLRequestrequestWithURL:[NSURL fileURLWithPath:@"f"]]];
// 在上面添加一个按钮，实现oc端控制h5实现弹alert方法框
self.btn = [[UIButton alloc]initWithFrame:CGRectMake(100,400,100, 40)];
self.btn.backgroundColor = [UIColorredColor];
[self.btn addTarget:selfaction:@selector(showAlert) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.btn];
}
-(void)showAlert
{
//要将script的alert()方法转化为string类型
NSString *alertJs=@"alert('Hello Word')";
[_jsContext evaluateScript:alertJs];
}
-(void)webViewDidFinishLoad:(UIWebView*)webView{
_jsContext = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
_jsContext[@"startFunction"] =^(id obj){
////这里通过block回调从而获得h5传来的json数据
/*block中捕获JSContexts
我们知道block会默认强引用它所捕获的对象，如下代码所示，如果block中直接使用context也会造成循环引用，这使用我们最好采用[JSContext currentContext]来获取当前的JSContext:
*/
[JSContext currentContext];
NSData *data = [(NSString *)objdataUsingEncoding:NSUTF8StringEncoding ];
NSDictionary *dict =[NSJSONSerialization JSONObjectWithData:dataoptions:NSJSONReadingMutableContainers error:nil];
NSLog(@"data %@ ====== ShareUrl %@",obj,dict[@"shareUrl"]);
};
//
_jsContext.exceptionHandler = ^(JSContext*context, JSValue *exceptionValue) {
context.exception = exceptionValue;
//比如把js中的方法名改掉，OC找不到相应方法，这里就会打印异常信息
NSLog(@"异常信息：%@", exceptionValue);
};
_jsContext[@"testFunction"] =^(id obj){
//这里通过block回调从而获得h5传来的json数据
[JSContext currentContext];
NSData *data = [(NSString *)objdataUsingEncoding:NSUTF8StringEncoding ];
NSDictionary *dict = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
// NSLog(@" data %@ ====== ShareUrl%@",obj,dict[@"shareUrl"]);
UIAlertView *alertView = [[UIAlertViewalloc] initWithTitle:dict[@"title"]message:dict[@"content"]delegate:nilcancelButtonTitle:@"cancel"otherButtonTitles:nil,nil];
[alertView show];
};
}
-(BOOL)webView:(UIWebView *)webViewshouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL * url = [requestURL];
//NSLog(@"scheme信息：%@", [urlscheme]);
if ([[url scheme] isEqualToString:@"testfunction"])
{
NSArray *params =[url.querycomponentsSeparatedByString:@"&"];
NSMutableDictionary *tempDic = [NSMutableDictionarydictionary];
for (NSString *paramStrin params) {
NSArray *dicArray = [paramStrcomponentsSeparatedByString:@"="];
if (dicArray.count >1) {
NSString *decodeValue =[dicArray[1]stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[tempDic setObject:decodeValueforKey:dicArray[0]];
}
}
UIAlertView *alertView = [[UIAlertViewalloc] initWithTitle:tempDic[@"title"]message:tempDic[@"content"]delegate:selfcancelButtonTitle:@"收到"otherButtonTitles:nil];
[alertView show];
NSLog(@"tempDic:%@",tempDic);
return NO;
}
return true; //为yes加载内容，否则不
}3. Android code Interaction on
mWebH5.addJavascriptInterface(new MyJavaScriptInterface(this), "android");
mWebH5.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
//返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器 view.loadUrl(url); return true;
}
});@JavascriptInterface
publicvoid startFunction(String json){
if(SharedPrefs.getInstance().getUserAccessToken()==null){
Gson gson=new Gson();
finalShareLinkBean shareLinkBean =gson.fromJson(json, ShareLinkBean.class);
LogUtils.i("test",json);
mActivity.runOnUiThread(new Runnable() {
@Override
publicvoid run() {
//跑相关逻辑
}
});
}The above is the method of interaction between JS and app that I compiled for everyone. I hope it will be helpful to everyone in the future.
Related articles:
Explain in detail the use of Js apply() (including code)
Easy to understand, self-study javascript Study Notes
# Several solutions to automatically execute (load) js on the page, detailed code analysis
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