> class Utils: NSObject {
>
> class func isValidUrl(url: NSURL?) {
> var lower = url?.scheme?.lowercaseString
> return lower == "http" || lower == "https"
> }
> }
> Sadly I'm getting and error in the return line that I can't interprete:
> Cannot invoke == with argument list of type `($T4, $T8)`
>
> What I'm doing wrong?
You didn't specify the return type of the function.
lower is an optional and may be nul.
Why is it a class function?
Try it this way using a global function
func isValidUrl(url: NSURL?) -> Bool {
if let lower = url?.scheme?.lowercaseString {
return lower == "http" || lower == "https"
}
return false
}
let foo = NSURL(string: "some/string")
let bar = NSURL(string: "http://some/string";)
isValidUrl(foo) // false
isValidUrl(bar) // true
I'd also rename the the function to hasHTTPScheme or something similar.
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