[Objective-C] How to convert NSURL into NSString

if nsurl has url scheme like as "http://" , use [url absoluteURL];
 else, use [url relativeString]; 


if URL has korean, use stringByAddingPercentEscapesUsingEncoding:
 

webVC.urlString = [[result objectForKey:@"url"] // NSString

stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];