Check if link pressed in UIWebView

问题

I have a UIWebView which is set the URL like this:

let url = NSURL (string: "http://google.com");
    let requestObj = NSURLRequest(URL: url!);
    webView.loadRequest(requestObj);

However I'd like to be able to check if the user as pressed a link.

I tried something simple like this:

if (url != "http://google.com") {
            println("Do Stuff");
        }

which worked fine, however this only checks it in the viewDidLoad I'd like to now every time a link is pressed or when the URL changes.

回答1:

You can check the URL with making an custom function

func validateUrl (stringURL : NSString) -> Bool {

    var urlRegEx = "((https|http)://)((\\w|-)+)(([.]|[/])((\\w|-)+))+"
    let predicate = NSPredicate(format:"SELF MATCHES %@", argumentArray:[urlRegEx])
    var urlTest = NSPredicate.predicateWithSubstitutionVariables(predicate)

    return predicate.evaluateWithObject(stringURL)
}

It will return true or false. That is Bool

for example :

if (validateUrl("http://google.com")) {
    //will return true
    println("Do Stuff");
}
else
{
    //If it is false then do stuff here.
}

Call this function in

func webView(WebViewNews: UIWebView!, shouldStartLoadWithRequest request: NSURLRequest!, navigationType: UIWebViewNavigationType) -> Bool {
    if (validateUrl(request.URL().absoluteString())) {
        //if will return true
        println("Do Stuff");
    }
}

Source : https://stackoverflow.com/a/24207852/3202193

来源：https://stackoverflow.com/questions/31347143/check-if-link-pressed-in-uiwebview