网页js

2019-11-14 18:39:38

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来源：转载

供稿：网友

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

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

#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;
}