JS与iOS之间的通信

JS与iOS之间的通信，主要运用两个方法：(PhoneGap框架也是基于此原理)

1、UIWebView的 stringByEvaluatingJavaScriptFromString方法

2、UIWebViewDelegate的

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType方法

示例：

上部分是一个UIWebView，实现UIWebViewDelegate

[plain] view plain copy print ?

- (void)viewDidLoad
{
[super viewDidLoad];
NSString *path = [[NSBundle mainBundle] pathForResource:@"jm/info" ofType:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]];
[self.webView loadRequest:request];
}
- (void)viewDidLoad { [super viewDidLoad]; NSString *path = [[NSBundle mainBundle] pathForResource:@"jm/info" ofType:@"html"]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]]; [self.webView loadRequest:request]; }

[plain] view plain copy print ?

#pragma mark - UIWebViewDelegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
if([request.mainDocumentURL.relativePath isEqualToString:@"/getInfo/name"])
{
NSString *info = [[UIDevice currentDevice] name];
NSString *js = [NSString stringWithFormat:@"showInfo(\"name\",\"%@\")",info];
[self.webView stringByEvaluatingJavaScriptFromString:js];
return false;
}
if([request.mainDocumentURL.relativePath isEqualToString:@"/getInfo/systemVersion"])
{
NSString *info = [[UIDevice currentDevice] systemVersion];
NSString *js = [NSString stringWithFormat:@"showInfo(\"systemVersion\",\"%@\")",info];
[self.webView stringByEvaluatingJavaScriptFromString:js];
return false;
}
return true;
}

#pragma mark - UIWebViewDelegate

1- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
2{
3    if([request.mainDocumentURL.relativePath isEqualToString:@"/getInfo/name"])
4    {
5        NSString *info = [[UIDevice currentDevice] name];
6        NSString *js = [NSString stringWithFormat:@"showInfo(\"name\",\"%@\")",info];
7        [self.webView stringByEvaluatingJavaScriptFromString:js];
8        return false;
9    }
10    if([request.mainDocumentURL.relativePath isEqualToString:@"/getInfo/systemVersion"])
11    {
12        NSString *info = [[UIDevice currentDevice] systemVersion];
13        NSString *js = [NSString stringWithFormat:@"showInfo(\"systemVersion\",\"%@\")",info];
14        [self.webView stringByEvaluatingJavaScriptFromString:js];
15        return false;
16    }
17    return true;
18}

JS代码：

[html] view plain copy print ?

<!DOCTYPE html\>
<html>
<head>
<title>city</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel\="stylesheet" href\="jquery.mobile-1.0.css"/>
<script type\="text/javascript" src\="jquery.js"\></script\>
<script type\="text/javascript" src\="jquery.mobile-1.0.js"\></script\>
<script>
function getInfo(name)
{
window.location = "/getInfo/"+name;
}
function showInfo(id,info)
{
$("p#"+id).html(info);
}
</script>
</head>
<body>
<div data-role\="page"\>
<div data-role\="content"\>
<h2>Divice Info</h2>
<div data-role\="collapsible-set" data-theme\="c" data-content-theme\="d"\>
<div data-role\="collapsible"\>
<h3 onclick\="getInfo('name')"\>name</h3\>
<p id\="name"\></p\>
</div>
<div data-role\="collapsible"\>
<h3 onclick\="getInfo('systemVersion')"\>systemVersion</h3\>
<p id\="systemVersion"\></p\>
</div>
</div>
</div>
</div>
</body>
</html>

JS与iOS之间的通信

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