中文URL处理

对于包含的中文的URL可以这样处理

Decode

NSString * str = [strURLstringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

Encode

- (NSString*)encodeURL:(NSString *)string
{
    NSString *newString = NSMakeCollectable([(NSString *)CFURLCreateStringByAddingPercentEscapes(
                                                              kCFAllocatorDefault,
                                  (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"),
                        CFStringConvertNSStringEncodingToEncoding([self stringEncoding])) autorelease]);
    if (newString) {
        return newString;
    }
    return @"";
}