count down time or count even

[likemilks]

Hi,I was new here,I have some experience with Java,but In objective C ,I learn some iPhone tutorial, I learn some basic stuff, like how built UITableView ,how to using picker something like that. I even don't know how to read the documentation. so please give some idear ,also I am looking for a count down even tutorial, can any one make one or share some code ?I really need this for my project,thanks