On May 25, 2014, at 10:05 AM, Koen van der Drift wrote: > 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
> 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). The docs for +URLWithString: say that the string "[m]ust be a URL that conforms to RFC 2396. This method parsesURLString according to RFCs 1738 and 1808." RFC 1808 is about the syntax for relative URLs. I suspect that "P12345" meets the (fairly loose) criteria for a relative URL string. I suspect that many strings will. You are abusing the API. If you call +URLWithString:, Cocoa assumes that the string is a URL and will do its best to interpret it as such. It will fail only if the string _can't_ be interpreted as a URL. This is not a method for determining if a string is a typical URL suitable for any particular purpose (like opening in a browser). You might want to see if NSDataDetector with NSTextCheckingTypeLink would work better for your purposes. Regards, Ken _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
