//1：编码

- (NSString *)encodeToPercentEscapeString: (NSString *) input  {      // Encode all the reserved characters, per RFC 3986      // ()

NSString *outputStr = (NSString *)

CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,

(CFStringRef)input,

NULL,

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

kCFStringEncodingUTF8);

return outputStr;

}

//1：解码

- (NSString *)decodeFromPercentEscapeString: (NSString *) input

{

NSMutableString *outputStr = [NSMutableString stringWithString:input];

[outputStr replaceOccurrencesOfString:@"+"

withString:@" "

options:NSLiteralSearch

range:NSMakeRange(0, [outputStr length])];

return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

}