How to validate an url on the iPhone

user_174868 0
Viewed 72707

In an iPhone app I am developing, there is a setting in which you can enter a URL, because of form & function this URL needs to be validated online as well as offline.

So far I haven't been able to find any method to validate the url, so the question is;

How do I validate an URL input on the iPhone (Objective-C) online as well as offline?

xcode objective-c url iphone ios
22 Answers

Objective C

- (BOOL)validateUrlString:(NSString*)urlString
{
    if (!urlString)
    {
        return NO;
    }

    NSDataDetector *linkDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];

    NSRange urlStringRange = NSMakeRange(0, [urlString length]);
    NSMatchingOptions matchingOptions = 0;

    if (1 != [linkDetector numberOfMatchesInString:urlString options:matchingOptions range:urlStringRange])
    {
        return NO;
    }

    NSTextCheckingResult *checkingResult = [linkDetector firstMatchInString:urlString options:matchingOptions range:urlStringRange];

    return checkingResult.resultType == NSTextCheckingTypeLink && NSEqualRanges(checkingResult.range, urlStringRange);
}

Hope this helps!

user_46415050

My solution in Swift 5:

extension String {
    func isValidUrl() -> Bool {
        do {
            let detector = try NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
            // check if the string has link inside
            return detector.numberOfMatches(in: self, options: [], range: .init( location: 0, length: utf16.count)) > 0
        } catch {
            print("Error during NSDatadetector initialization \(error)" )
        }
        return false
    }
}
user_35426880
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