I'd like to detect when a user presses a webform button present in an HTML page loaded in an iOS webview (ideally using WKWebView). Is this possible? And if so, how?
General comment:
I know that WKWebView has some limitations hence if you know a method that works with WKWebView please share it. If you know a method that works with UIWebView please share that as well as I can use it as start to find a solution for my WKWebView based app.
To do so using WKWebView, you need to conform to WKNavigationDelegate, and set the webView's navigationDelegate.
The method you're probably looking for is - webView:decidePolicyForNavigationAction:decisionHandler:, where you can determine whether to allow the link touch or not. You can get the target URL from navigationAction.request.URL.
A quick example:
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
if ([navigationAction.request.URL.relativeString hasPrefix:kLocalContentPrefix])
{
// Show some local content
// Don't let the webview load this URL.
decisionHandler(WKNavigationActionPolicyCancel);
}
else
{
// Allow the webview to load this URL.
decisionHandler(WKNavigationActionPolicyAllow);
}
}
To do this in UIWebView, it's almost the same, except you just conform to -(BOOL)webView:shouldStartLoadWithRequest:navigationType: in UIWebViewDelegate. But I would recommend using Webkit if possible!
There is a workaround, demonstrated by shazron in Objective-C here https://github.com/shazron/WKWebViewFIleUrlTest to copy files into /tmp/www and load them from there.
