Question

what is the best method to implement a alarm with my iPhone app? NSTimer, or DatePicker? help me with some code !

Answer 1

I think you will need to use DatePicker.

Also you can use UILocalNotifications, which could be a great help.

You can pick Alarm date from DatePicker and then set it as fireDate for your UILocalNotification.

For more information you may want to refer to UIDatePicker Class Reference and UILocalNotification Class Reference

EDIT:

Refer to this post and answer of Ole Begemann under it:

How to implement an alarm with iPhone SDK 4.0

Also refer to this sample code, I have not checked it personally but may be it could help you:

iDharmaClock

EDIT-2: Solution about playing custom sounds in Local notifications

Add any file in your iPhone app’s Resources and then use the below code:

Let us suppose that notification is an object of type UILocalNotification.

notification.soundName = @"sound.caf";

If this doesn’t work initially then you may refer to this post and there in refer to answer of Noah Witherspoon. That tells us to use sound file of the correct format (i.e. either Linear PCM or IMA4).

Choose custom sound for local notifications

Hope this helps.

Let me know if you need more help.