Created
February 23, 2012 02:21
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Call Objective-C methods from UIWebView, with optional argument
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| // | |
| // by Mark Boszko | |
| // | |
| // Expanded from code by DAMIEN LE BERRIGAUD | |
| // http://meliondesign.blogspot.com/2010/02/mapping-uiwebview-links-to.html | |
| // | |
| // | |
| // Sample code to return a method call, | |
| // with or without argument, from UIWebView | |
| // links with format: | |
| // selector://selectorString#argument [#argument is optional] | |
| // | |
| // This would go in your controller/delegate file. | |
| // | |
| // for instance: | |
| // | |
| // selector://linkIntercept | |
| // will call | |
| // - linkIntercept | |
| // | |
| // selector://linkInterceptWithArgument#arg | |
| // will call | |
| // - linkInterceptWithArgument:arg | |
| // | |
| // You might want to change the selector:// scheme to | |
| // something with random characters, like qa7cf3xr:// | |
| // to avoid overriding another app's registered scheme | |
| // on the user's device, and provide minimal protection | |
| // against malicious URLs. | |
| // In fact, you could generate the random scheme string | |
| // at runtime, if you really want to go nuts. | |
| // | |
| // Mike Ash suggested security improvements | |
| // | |
| - (void)viewDidLoad | |
| { | |
| [super viewDidLoad]; | |
| self.webView.delegate = self; | |
| NSString *htmlString = @"<!DOCTYPE HTML><html><body><p><a href=\"selector://linkIntercept\">Log me!</a></p><p><a href=\"selector://linkInterceptWithArgument#arg\">Log me with argument!</a></p></body></html>"; | |
| [self.webView loadHTMLString:htmlString baseURL:nil]; | |
| } | |
| #pragma mark - Web view delegate method | |
| - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { | |
| NSLog(@"%@ %@", NSStringFromClass([self class]), NSStringFromSelector(_cmd)); | |
| NSString *scheme, *selectorString, *argumentString = nil; | |
| // Intercept the link | |
| if (navigationType == UIWebViewNavigationTypeLinkClicked) { | |
| [webView stopLoading]; | |
| // Grab the parts of the URL we need | |
| // <scheme>://<host>#<fragment> | |
| scheme = [[request URL] scheme]; | |
| selectorString = [[request URL] host]; | |
| argumentString = [[request URL] fragment]; | |
| // Check for our selector:// scheme, then match it to a method we'll allow (thanks Mike Ash) | |
| if ([scheme isEqualToString: @"selector"]) { | |
| if ([selectorString isEqual: @"linkIntercept"]) { | |
| [self linkIntercept]; | |
| } else if ([selectorString isEqual: @"linkInterceptWithArgument"]) { | |
| [self linkInterceptWithArgument: argumentString]; | |
| } else { | |
| NSLog(@"Could not match selector: %@", selectorString); | |
| } | |
| } | |
| return NO; | |
| } | |
| // Let other links be handled by the webview. | |
| return YES; | |
| } | |
| #pragma mark - methods called from web links | |
| - (void)linkIntercept { | |
| NSLog(@"%@ %@", NSStringFromClass([self class]), NSStringFromSelector(_cmd)); | |
| } | |
| - (void)linkInterceptWithArgument:(NSString *)argument { | |
| // insert code here to make sure argument is something valid for your method | |
| // and won't cause a crash or load unwanted data (thanks again Mike Ash) | |
| NSLog(@"%@ %@ %@", NSStringFromClass([self class]), NSStringFromSelector(_cmd), argument); | |
| } |
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