NSString 取子串，拼字符串，分割

取得string长度 [string length];component

取子串： [string substringFromIndex:index];   //从index位取到字符串尾orm

[string substringWithRange:NSMakeRange(location,substringLength)]; //location代表起始位置，substringLength代表取长度字符串

拼接字符串： [NSString stringWithFormat:@"%@%@%@",string1,string2,string3];string

分割字符串it

NSArray *list = [string componentsSeparatedByString:@"/"];  //将字符串用/分割，存入list中。io