Alright, thanks all, I'll have a look at NSDataDetectors.
Happy Sunday,
- Koen.
On May 25, 2014, at 11:29 AM, Mike Abdullah <mabdul...@karelia.com> wrote:
>
> On 25 May 2014, at 16:05, Koen van der Drift <koenvanderdr...@gmail.com>
> wrote:
>
>> Hi,
>>
>> At one point in my code I need to recognize an URL to show in a different
>> color. Pretty standard:
>>
>> NSURL *url = [NSURL URLWithString: aString];
>>
>> if (url) // if url is created change color
>> {
>> NSAttributedString *linkString = [[NSAttributedString alloc]
>> initWithString: aString
>>
>> attributes: @{NSForegroundColorAttributeName: [UIColor blueColor]}];
>>
>> ...etc
>> }
>>
>> Works great, if aString starts with eg http:// it will be in blue; regular
>> strings won't.
>>
>>
>> However, I noticed that strings that have the form P12345 also turn blue.
>> Any idea why that string would turn into an NSURL? The url scheme is nil,
>> and the path components just show P12345.
>>
>> (I could test above for if (url.scheme) to avoid this, but knowing why this
>> happens would actually help me with other parts in my app).
>
> NSURL accepts anything while conforms to the URL specs (as listed at the top
> of the documentation). You probably want the litmus test of if the
> resourceSpecifier begins with a double slash (again, as detailed at the top
> of the docs).
>
> As Uli says though, there’s a pretty good chance if this is user input, you
> want to be more lenient, and go with what NSDataDetector can parse out.
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