In a native iPhone app, I use a UIWebView to load a web page.
I want to use JavaScript in the web page to communicate back with the Objective-C code, for example invoke a function in Objective-C code.
Is there any way to implement this?
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take a look at phonegap, they use the url to communicateThomas– Thomas2010-12-23 07:55:23 +00:00Commented Dec 23, 2010 at 7:55
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1 Answer
There is no "direct" way to do this, but you could utilize the UIWebViewDelegate and trap a link with a custom scheme, so in your markup, you'd write something like this:
<a href="myapp://app_action?doSomething">Do Something</a>
Then, in your UIWebViewDelegate's -webView:shouldStartLoadWithRequest:navigationType: method, write something like this:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if([[[request URL] scheme] isEqualToString:@"myapp"]) {
SEL selector = NSSelectorFromString([[request URL] query]);
if([self respondsToSelector:selector]) {
[self performSelector:selector];
} else {
//alert user of invalid URL
}
return NO;
}
return YES;
}
