How to make native iOS app response to a click event in UIWebView?

Question

Say I may have a UIWebView displays a page which contains a link. When user clicks the link, is it possible to trigger a event to update native UI? For example, when user clicks the link, I want to change the progress value in UIProgressView. Is there any way to do this? Thank you!

http://stackoverflow.com/questions/15537320/invoke-method-in-objective-c-code-from-html-code-using-uiwebview/15541607#15541607 look at this question — Vinodh, Jul 02 '13 at 09:01

score 2 · Answer 1 · answered Jul 02 '13 at 06:44

Try using this method:

    - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
   return TRUE;
}

and you can check the navigationType value:

enum {
   UIWebViewNavigationTypeLinkClicked,
   UIWebViewNavigationTypeFormSubmitted,
   UIWebViewNavigationTypeBackForward,
   UIWebViewNavigationTypeReload,
   UIWebViewNavigationTypeFormResubmitted,
   UIWebViewNavigationTypeOther
};

score 0 · Answer 2 · answered Jul 02 '13 at 06:41

You need to implement webView:shouldStartLoadWithRequest:navigationType: protocol method.

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    // the request variable contains the request the user clicked on.
}

score 0 · Answer 3 · answered Jul 02 '13 at 06:46

You can use detecting touch events in the UIWebview by delegate methods below

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
    NSLog(@"Touches began");
}
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
   NSLog(@"Touches moved");
}
- (void) touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
    NSLog(@"Touches ended");
}
- (void) touchesCancelled:(NSSet*)touches withEvent:(UIEvent*)event {
    NSLog(@"Touches cancelled");
}

You have to add the UIWebView covering the main view and add a custom class that extends UIWindow to capture touch events.

You can find a step by step tutorial blog here.

How to make native iOS app response to a click event in UIWebView?

3 Answers3