UIWebView delegate method shouldStartLoadWithRequest: equivalent in WKWebView?

I’ve been looking for a good explanation myself, but haven’t found one. I’ve used the following in my app and everything seems to work (Edit: updated based on ccoroom’s comment):

UIWebViewDelegate     - webView:shouldStartLoadWithRequest:navigationType:
WKNavigationDelegate  - webView:decidePolicyForNavigationAction:decisionHandler:

Here’s the other UIWebViewDelegate methods:

UIWebViewDelegate     - webViewDidStartLoad:
WKNavigationDelegate  - webView:didCommitNavigation:

UIWebViewDelegate     - webViewDidFinishLoad:
WKNavigationDelegate  - webView:didFinishNavigation:

UIWebViewDelegate     - webView:didFailLoadWithError:
WKNavigationDelegate  - webView:didFailNavigation:withError:
                      - webView:didFailProvisionalNavigation:withError:

I’d love for someone to confirm this for me though.

Edit: Actually, I’ve answered the question you had in the title (although I’m no longer confident that webView:didCommitNavigation: is called at the exact same point in the lifecycle), but re-reading your description it looks like what you actually need to know about is how to reimplement a Javascript/Objective-C bridge using WKWebView. So have a look at my other answer.