Get parameters from a link in a webview

Question

I have created a webview in a viewController and loading a page like this

func loadAddress(){
    let requestURL = NSURL(string:"http://www.example.com/")
    let request = NSURLRequest(url: requestURL as! URL)
    webview.loadRequest(request as URLRequest)
}

And calling this in

viewDidLoad

I have somelinks in the page with URL parameters like this

http://www.example.com?id=1&title=ABC

Now when a user clicks this link from the app then instead of redirecting to URL, I want to get the parameters from URL and open a dialog box in iOS

I have found some examples in Objective C but I am looking for a solution in Swift 3

PS: I have access to this website's HTML I can replace links as required by Xcode

EDIT: Here is what i have tried, in the same file where my webview is i wrote this function

func webView(_ webView: UIWebView,shouldStartLoadWith request: URLRequest,navigationType: UIWebViewNavigationType) -> Bool {

    let scheme = request.url!
    NSLog(scheme.absoluteString)

    return false

}

and also made sure that the class is a delegate to webview

what am i doing wrong?

Unrelated to your issue, but please note that you should not downcast NSURL to URL or NSURLRequest to URLRequest, [just use the new structs directly](http://stackoverflow.com/questions/37812286/swift-3-urlsession-shared-ambiguous-reference-to-member-datataskwithcomplet/37812485#37812485). — Eric Aya, Dec 19 '16 at 13:56
Probably, but it's irrelevant. Xcode is just an IDE, it's not always right. Actually, sometimes, it's plain wrong... ;) TL;DR: don't downcast when you don't have to, whatever Xcode tells you. — Eric Aya, Dec 19 '16 at 13:59

score 0 · Answer 1 · edited May 23 '17 at 12:33

0

you should handle the webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool method, that takes the URLRequest as a parameter. In this method you can do whatever you want to that URL.

Don't forget to set your class as the delegate of the webview.

If you want to play with the query string, you can get inspiration from this objective-c answer

edited May 23 '17 at 12:33

Community

1
1

answered Dec 19 '16 at 14:06

under this function i have my code looks like this, let scheme = request.url! NSLog(scheme.path) return true – Wasif Khalil Dec 19 '16 at 14:11
and class is a delegate of webview, but nothing prints in log when i click the link – Wasif Khalil Dec 19 '16 at 14:12
what if you write NSLog(scheme.absoluteSring) ? – Dec 19 '16 at 14:25
and just a question, why do you call the NSURL "scheme"? and not some url name? – Dec 19 '16 at 14:27
i have updated the question with what you have suggested, please check – Wasif Khalil Dec 19 '16 at 14:35
i found this help from somewhere i just copy pasted the "scheme" thing – Wasif Khalil Dec 19 '16 at 14:36
@WasifKhalil what does NSLog(scheme.absoluteString) print? – Dec 19 '16 at 14:43
it prints nothing in the log, looks like the function is not even calling – Wasif Khalil Dec 19 '16 at 14:46
the NSLog? try to put some string before scheme.absoluteURL – Dec 19 '16 at 14:51
i tried NSLog("WORKING: "+scheme.absoluteString) but nothing in the log, it seems like the function is not calling – Wasif Khalil Dec 19 '16 at 14:57
my viewcontroller where the webview is, is inside a TabbarController, does it affect anything? – Wasif Khalil Dec 19 '16 at 14:58
No, just make sure the viewcontroller is the delegate of the webview – Dec 19 '16 at 14:59
yes it is delegate, because i have webViewDidStartLoad and webViewDidFinishLoad to show and hide the UIActivityIndicatorView, which is working fine – Wasif Khalil Dec 19 '16 at 15:01
@WasifKhalil so remove shouldStartLoadWithRequest and rewrite it again, use autocompletion for this ;) please update me if it's ok – Dec 19 '16 at 15:42
it didnt work http://stackoverflow.com/questions/28389612/dispatch-async-uiwebview-loadrequest just wondering why some people using dispatch_async? does it affect anything – Wasif Khalil Dec 19 '16 at 15:43
i have found the solution :) going to post it as answer – Wasif Khalil Dec 19 '16 at 16:30

score 0 · Answer 2 · answered Dec 19 '16 at 16:35

I have found a solution myself, the code i had written was correct, i just had to make sure that my class also implements UIWebViewDelegate

so the class looks like this

class Mainbillboard: UIViewController,UIWebViewDelegate {


@IBOutlet weak var activity: UIActivityIndicatorView!
@IBOutlet weak var webview: UIWebView!


override func viewDidLoad() {
    self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    loadAddress()
}

func loadAddress(){
    let requestURL = NSURL(string:"example.com")
    let request = NSURLRequest(url: requestURL as! URL)
    webview.loadRequest(request as URLRequest)

}

func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {

    let scheme = request.url!
    NSLog(scheme.absoluteString)
    NSLog("here it worked!!")

    return true

}


func webViewDidStartLoad(_:UIWebView){
    self.view.bringSubview(toFront: self.activity)
    activity.startAnimating()
    NSLog("Indicator is loading")

}

func webViewDidFinishLoad(_:UIWebView){
    activity.stopAnimating()
    NSLog("Indicator stopped loading")
}

}

Get parameters from a link in a webview

2 Answers2