如何从JavaScript调用Objective-C方法? [英] How can I call Objective-C methods from JavaScript?
问题描述
我想在UIWebView上显示 SQLite 数据库内容.为此，我有一个本地HTML文件.在加载到JavaScript文件的html文件中的Body上.在Java脚本内部如何调用Objective-c方法.如何从Objective c到Java Srcipt中获取数据.
I want to display SQLite Data base content on UIWebView. For that i have a local HTML file. On Body load in html file calling JavaScript Function. Inside the Java Script how to call Objective-c method. how to get Data from Objective c to Java Srcipt.
<html>
<head>
<!-- a script inline -->
<script language="JavaScript" TYPE="text/javascript">
<!--
function myJsFunc()
{
//here i want to call objective-c methods.
}
// -->
</script>
</head>
<Body Bgcolor=#800000 onload="myJsFunc(); return true;">
</Body>
</html>
Objective-C代码......
Objective-C code ......
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *path;
NSBundle *thisBundle = [NSBundle mainBundle];
path = [thisBundle pathForResource:@"Demo" ofType:@"html"];
// make a file: URL out of the path
NSURL *instructionsURL = [NSURL fileURLWithPath:path];
[myWebView loadRequest:[NSURLRequest requestWithURL:instructionsURL]];
[self.view addSubView:myWebView];
}
-(NSArray*)FetchingDataFromDataBase{
// Code for retriving data from SQlite data Base, and return NSArray;
return myArray;
}
在函数 myJSFunc ()中，如何调用-(NSArray *)FetchingDataFromDataBase.
Inside the Function myJSFunc(), how can call -(NSArray*)FetchingDataFromDataBase.
推荐答案
graver给出的博客文章解释了如何实现.
The blog post given by graver explains it how to do it.
- (BOOL)webView:(UIWebView *)webView2
shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType
如果您的类中具有上述方法，则将在加载新页面之前调用此方法.仅当此方法返回YES时，才会处理新的加载请求.我们使用这种机制来回传给Objective-C函数.
If you have the above method in your class, this method will be called before a new page is loaded. Only if this method returns YES, the new load request is processed. We use that mechanism to communicate back to the Objective-C functions.
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