在iOS开发之Objective-C与JavaScript交互操作 中我们可以通过stringByEvaluatingJavaScriptFromString 去实现在obj-C中获取到相关节点属性,添加javascript代码等功能。但是我们如何监听到javascript的响应事件呢。在MAC OS中有效的API去实现,但iPhone没有,但我们有一个技巧途径:
大概思路是:在JavaScript事件响应时,通过设置document.location,这会引发webview的一个delegate方法,从而实现发送通知的效果,即达到监听的目的。
1、在javascript与webView之间定一个协议约定:
myapp:myfunction:myparam1:myparam2
2、在javascript中添加代码:
document.location = "myapp:" + "myfunction:" + param1 + ":" + param2;
3、在webView的delegate方法webView:shouldStartLoadWithRequest:navigationType: 添加
- (BOOL)webView:(UIWebView *)webView2 shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSString *requestString = [[request URL] absoluteString]; NSArray *components = [requestString componentsSeparatedByString:@":"]; if ([components count] > 1 && [(NSString *)[components objectAtIndex:0] isEqualToString:@"myapp"]) { if([(NSString *)[components objectAtIndex:1] isEqualToString:@"myfunction"]) { NSLog([components objectAtIndex:2]); // param1 NSLog([components objectAtIndex:3]); // param2 // Call your method in Objective-C method using the above... } return NO; } return YES; // Return YES to make sure regular navigation works as expected. }
http://www.codingventures.com/2008/12/using-uiwebview-to-render-svg-files/
本文转自老Zhan博客园博客,原文链接:http://www.cnblogs.com/mybkn/archive/2012/12/01/2797436.html,如需转载请自行联系原作者