// 오리지널 메시지
NSString *message = @"Hello~
Welcome to hooni.net";
 
// URL Encode
NSString *escaped = [message
    stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"escaped string :
%@", escaped);
 
// URL Decode
NSString *decoded = [escaped
    stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"decoded string :
%@", decoded);