首页 > 代码库 > IOS Object和javaScript相互调用
IOS Object和javaScript相互调用
在IOS开发中有时会用到Object和javaScript相互调用,详细过程例如以下:
1. Object中运行javascript代码,这个比較简单,苹果提供了非常好的方法
- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script
2. javascript运行过程中返回给Object的数据或者调用Object方法。这个时候就须要用到UIWebView的地址重定向功能。主要代码例如以下:
(1)创建UIWebView
webView = [[UIWebView alloc] initWithFrame:self.view.bounds]; webView.delegate = self; [self.view addSubview:webView]; [self loadWebPageWithString:_url]; - (void)loadWebPageWithString:(NSString*)urlString { NSURL *url =[NSURL URLWithString:urlString]; NSURLRequest *request =[NSURLRequest requestWithURL:url]; [webView loadRequest:request]; }
#pragma mark - UIWebViewDelegate - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSString *urlString = [[request URL] absoluteString]; debuglog(@"urlString = %@",urlString); NSString *prefix = @"myvideo"; if ([urlString hasPrefix:prefix]) { NSString *endString = [urlString substringFromIndex:7]; debuglog(@"last urlString = %@",endString); return NO; } return YES; } - (void)webViewDidStartLoad:(UIWebView *)webView { } - (void)webViewDidFinishLoad:(UIWebView *)webView { [self excuteJavaScript]; } - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { } - (void)excuteJavaScript { NSString *js = @"var video = document.getElementsByTagName(‘video‘)[0];setTimeout(getVideo,1000); function getVideo(){ video = document.getElementsByTagName(‘video‘)[0];if(video==undefined){setTimeout(getVideo,1000);}else{ video.pause();if(video.src=http://www.mamicode.com/=‘‘){var video = document.getElementsByTagName(‘source‘)[0];}document.location = ‘myvideo‘+ video.getAttribute(‘src‘);injectedObject.playVideo(video.getAttribute(‘src‘));}}";>说明例如以下:
(1)在UIWebView载入完网页的时候,即运行到webViewDidFinishLoad代理的时候。运行一段javascript代码。这段代码的作用是获取网页中的视频地址,代码中“ document.location = ‘myvideo‘+ video.getAttribute(‘src‘); ”这段特别重要,document.location是为了做地址重定向用的,运行完这段javascript代码。接着就会运行
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 这个代理方法,当中就会捕获到document.location给出的地址即‘myvideo‘+ video.getAttribute(‘src‘); 。你能够去掉‘myvideo‘头。就能够得到你须要的东西了。当中‘myvideo‘是你自定义的一个头。是为了便于解析后面的数据。
IOS Object和javaScript相互调用