Compare NSURL scheme in Swift with a String

Question

I was wondering if this is possible to do in swift and what it would be the way of doing it?

I just want to be able to compare? the scheme of my url to whatever string I want.. This is how I have been doing it in objc.

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
        if ([request.URL.scheme isEqual: @"http"] || [request.URL.scheme isEqual:@"https"]) {
            return NO;
        }

    return YES;
}

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score 1 · Accepted Answer · answered Feb 06 '15 at 04:11

1

Use == in Swift instead of isEqual: or isEqualToString: in Objective-C

if (request.URL.scheme == "http" || request.URL.scheme == "https") {

answered Feb 06 '15 at 04:11

ozz

1,137
7
9

This doesn't compile. – Aaron Brager Feb 11 '15 at 07:16
This helped me because I realized that in Swift I can compare `NSURL`s using the operator `==`, while in Objective-C I had to compare them using the method `-(BOOL)isEqual:` – gabriel_vincent Aug 25 '15 at 02:58

score 1 · Answer 2 · answered Feb 06 '15 at 04:21

1

Really Swifty:

if let scheme = request.URL.scheme {
    switch scheme {
    case "http", "https":
        return true
    default:
        return false
    }
}

Essentially, safely pull the scheme from the URL (could be nil after all) and then switch on it (which you can do in Swift but not Objective-C) using compound case statements.

answered Feb 06 '15 at 04:21

Jon Shier

12,200
3
35
37

This doesn't compile. – Aaron Brager Feb 11 '15 at 07:12

score 1 · Answer 3 · answered Feb 11 '15 at 07:20

The other 2 answers will fail if the source URL doesn't have the scheme in lowercase (i.e., hTTp://…).

Also, the other 2 answers fail to unwrap the optionals (request.URL?.scheme?).

Here's another option:

if let lowercaseScheme = request.URL?.scheme?.lowercaseString {
    if lowercaseScheme.rangeOfString("http") != nil {
        println("It's a match!")
    }
}

Or, in Swift 1.2 (Xcode 6.3):

if let lowercaseScheme = request.URL?.scheme?.lowercaseString where lowercaseScheme.rangeOfString("http") != nil {
    println("It's a match!")
}

Or, if you don't need to actually know the scheme inside the block:

if request.URL?.scheme?.lowercaseString.rangeOfString("http") != nil {
    println("It's a match!")
}

This will match http, https, and hTTpS. It will also match lolHTTProfl. If that's not okay in your use case, use the above answer's approach (the == operator), but with optional unwrapping and lowercaseString.

Compare NSURL scheme in Swift with a String

3 Answers3