How to get the coordinates of Hyperlink in UIWebview - objective-c

Question

I'm loading the pdf (Having multiple Hyperlinks) document in UIWebview. I have to show UIPopover over hyperlinks dynamically.
I'm able to capture the coordinates of hyperlink using TapGesture Action method
- (void)tapAction:(UITapGestureRecognizer *)sender
{
self.point = [sender locationInView:self.myWebView];
}
And presenting the UIPopover over hyperlink by using below method
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL *rqstUrl = [request URL];
if (([[rqstUrl scheme] isEqualToString: #"https"] || [[rqstUrl scheme] isEqualToString: #"http"]) && (navigationType == UIWebViewNavigationTypeLinkClicked))
{
[self.myWebView stopLoading];
CGRect rect = CGRectMake(self.point.x,self.point.y-5, 5, 5);
UIPopoverController *popController = [[UIPopoverController alloc] initWithContentViewController:contentViewController];
popController.popoverContentSize = CGSizeMake(500, 200);
self.popController = popController;
self.popController.delegate =self;
UIPopoverArrowDirection direction = UIPopoverArrowDirectionUp|UIPopoverArrowDirectionDown;
self.popController.popoverLayoutMargins = UIEdgeInsetsMake(0, rect.origin.x, 1, 1);
[self.popController presentPopoverFromRect:rect inView:webView permittedArrowDirections:direction animated:YES];
}
return YES;
}
But the problem is if I tapped in two different locations within 1 or 2 seconds like First Tap is On Hyperlink and Second Tap is on "somewhere else in UIWebview", UIPopover is presenting at second tap location only not in hyperlink location.
I have to show UIPopover based on the Hyperlink position only, not in other location.How can I resolve this issue?

Answer 1

Use an overlay view
Replace your method to register the tap location by an overlay with a tap through. UITapGestureRecognizer has these limitations:
When a tap occurs outside of an hyperlink, it does registers its location, thanks to the UITapGestureRecognizer.
Unfortunately, a UIWebview Hyperlink taps take precedence over the gesture recognizer, and you never get the centroid. This is the real problem, causing the popover to appear misplaced.
UIPopoverController is deprecated in iOS 9.
"UIPopoverController is deprecated. Popovers are now implemented as UIViewController presentations. Use a modal presentation style of UIModalPresentationPopover and UIPopoverPresentationController."
tapAction and shouldStartLoadWithRequest are not coupled, and can occur independently of each other. Furthermore, they are basically mutually exclusive.
Use the overlay to register location in that view, and tap-though to the views underneath. If your overlay and web view have the same frame, you can use the tap position interchangeably. The overlay will guarantee tight coupling, and the rest of your method will work as designed.
class TapOverlayView: UIView {
var centroid:CGRect = CGRect.zero
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
centroid = CGRect(origin: point, size: CGSize(width: 1, height: 1))
return nil // tap through
}
}
Delegate
extension ViewController: UIWebViewDelegate {
public func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
let rqstUrl = request.url
if( rqstUrl!.scheme?.contains("http"))! && ( .linkClicked == navigationType) {
webView.stopLoading()
let contentViewController = storyboard!.instantiateViewController(withIdentifier: "popover")
contentViewController.modalPresentationStyle = .popover
contentViewController.preferredContentSize = CGSize(width: 200, height: 40)
if let popController = contentViewController.popoverPresentationController {
popController.permittedArrowDirections = .down
popController.sourceView = webView
popController.sourceRect = CGRect(origin: tap.centroid.origin, size: CGSize.zero)
present(contentViewController, animated: true, completion: nil)
}
}
return true
}
}
► Find this solution on GitHub and additional details on Swift Recipes.