在iphone中设置本地通知(一个用于每日，另一个用于未来日期)

Im implementing a reminder app.There are two reminders (one for everyday and other for future dates.)everyday reminder is working fine.In the app there are some tips and when user like one tip,i want it to be able to save that tip for some date in future(eg:august 29 9.00pm).can anyone help me what is the correct path for implementing this scenario.All the tips are saved in an array.How can i save the different time and dates user selected from date picker into an array and fire the local notification at correct time and displaying the tip user saved for that day. (i tried using NSUserdefaults for saving the day and time and also retrieving the index of tip from array and comparing both but not working).Im implementing a reminder app.There are two re