For iOS encoding and decoding

Resolve URL Chinese problem encoding

-(NSString *) encodeurlwithstring: (NSString *) unescapedstring{

NSString *outputstr = (NSString *) cfurlcreatestringbyaddingpercentescapes (Kcfallocatordefault, CFStringRef) Unescapedstring,null, (Cfstringref) @ "!* ' ();: @&=+$,/?%#[]", kCFStringEncodingUTF8);

return outputstr;

}

Decoding

-(NSString *) decodeurlwithstring: (NSString *) str{

NSString *string3 = [str stringbyreplacingpercentescapesusingencoding:nsutf8stringencoding];

return string3;

}

Remove the spaces at both ends of the input box

-(NSString *) Deletewhitespacewithstr: (NSString *) str{

return [str stringbytrimmingcharactersinset:[nscharacterset whitespaceandnewlinecharacterset]];

}

Remove the middle space in the input box

-(NSString *) Removespace: (NSString *) str{

return [str stringbyreplacingoccurrencesofstring:@ "" withstring:@ "];

}

A more practical method