Question

So I have the following code:

 NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
    if ([currSysVer compare:@"5.0" options:NSNumericSearch] != NSOrderedAscending) {
        webScrollView = self.webView_.scrollView;
    } else {
        webScrollView = [self.webView_ defaultScrollView];
    }

webScrollView.delegate = self

and when I scroll it gives me:

-[UIWebView scrollViewDidScroll:]: unrecognized selector sent to instance 0x8e8610

this doesn’t make any sense why the UIWebView is calling the scrollViewDidScroll\

Answer 1

If you look here, UIWebView conforms to UIScrollViewDelegate. In essence it uses the same delegation, as UIWebView is scrollable (you might say it’s a subclass of UIScrollView, though it’s not explicitly stated in the documentation, likely a UIScrollView is a piece of the WebView).