objective dot在dot之前和之后获取子字符串

i have a string like 112.1 or 102.2 etc now i want to get the substring before dot and after the dot using objective c, means i want to get 2 substrings like this 112 and 1. please guide. Regards Saad. i have a string like 112.1 or 102.2 etc now i w