1.非ARC模式下
編碼

- (NSString *)encodeToPercentEscapeString: (NSString *) input
{
    // Encode all the reserved characters, per RFC 3986
    // (<http://www.ietf.org/rfc/rfc3986.txt>)
    NSString *outputStr = (NSString *) 
    CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                            (CFStringRef)input,
                                            NULL,
                                            (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                            kCFStringEncodingUTF8);
    return outputStr;
}

解碼

- (NSString *)decodeFromPercentEscapeString: (NSString *) input
{
    NSMutableString *outputStr = [NSMutableString stringWithString:input];
    [outputStr replaceOccurrencesOfString:@"+"
                               withString:@" "
                                  options:NSLiteralSearch
                                    range:NSMakeRange(0, [outputStr length])];

    return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}

2.ARC模式下

- (NSString *)encodeToPercentEscapeString: (NSString *) input
{
        NSString* outputStr = (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(

                                                                                           NULL, /* allocator */

                                                                                           (__bridge CFStringRef)input,

                                                                                           NULL, /* charactersToLeaveUnescaped */

                                                                                           (CFStringRef)@"!*'();:@&=+$,/?%#[]",

                                                                                           kCFStringEncodingUTF8); 
      return outputStr;
}

- (NSString *)decodeFromPercentEscapeString: (NSString *) input
{
    NSMutableString *outputStr = [NSMutableString stringWithString:input];
    [outputStr replaceOccurrencesOfString:@"+" withString:@"" options:NSLiteralSearch range:NSMakeRange(0,[outputStr length])];

    return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}