IOS encode解码与编码

/**decode编码*/ - (NSString *)encodeToPercentEscapeString {     NSString*     outputStr = (__bridge NSString *)CFURLCreateStringByAddingPercentEscapes(                                                                                                                                                            NULL, /* allocator */                                                                                                                                                            (__bridge CFStringRef)self,                                                                                                                                                            NULL, /* charactersToLeaveUnescaped */                                                                                                                                                            (CFStringRef)@"!*'();:@&=+$,/?%#[]",                                                                                                                                                            kCFStringEncodingUTF8);               return     outputStr; } /**decode解码*/ - (NSString *)decodeFromPercentEscapeString {     NSMutableString *outputStr = [NSMutableString stringWithString:self];     [outputStr replaceOccurrencesOfString:@"+"                                withString:@""                                   options:NSLiteralSearch                                     range:NSMakeRange(0,[outputStr length])];     return     [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; }