NSString * ?string=[countString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];//去除首位空格

NSString * ?string?= [countString stringByReplacingOccurrencesOfString:@" "withString:@""];//去除中間空格

NSString * ?string?=[countString stringByReplacingOccurrencesOfString:@"\n"withString:@""];//去除換行符