how to set NSTimer for alarm application? - iphone

Question

I am new in iPhone application development. Now i am developing alarm application for iPhone. In this application i am selected data from UIDataPicker. Then i applied to NSLocalNotification firedate with in alarm button action. It is working first time. Then second time agin click that button i again also working, but time also same. It is wrongly working.
Here i think i need to us NSTimer. I don't know how to use NSTimer, and also it is working background application also how to set this timer.
following developed code for alarm notification.
- (void) saveButtonAction:(id)sender {
[[UIApplication sharedApplication] cancelAllLocalNotifications];
Class cls = NSClassFromString(#"UILocalNotification");
if (cls != nil)
{
Resource *resourceLoader = [[Resource alloc] init];
NSDictionary *prefDic = [resourceLoader getPlistDataAsDictionary:#"preference"];
NSString *musicName;
NSDate *selectedDateTime = [[NSDate alloc]init];
if (prefDic && [prefDic objectForKey:#"alarmtime"]) {
//firstVal_textField.text = [prefDic objectForKey:#"value1"];
NSLog(#"saravanan %#",[prefDic objectForKey:#"alarmtime"]);
selectedDateTime = [prefDic objectForKey:#"alarmtime"];
NSLog(#"saravanan periyasamy %#", selectedDateTime);
musicName = [NSString stringWithFormat:#"%#%#",[prefDic objectForKey:#"alarmmusic"],#".wav" ];
}
UILocalNotification *notif = [[cls alloc] init];
//notif.fireDate = [datePicker date];
notif.fireDate = selectedDateTime;
notif.timeZone = [NSTimeZone defaultTimeZone];
notif.alertBody = #"Alarm";
notif.alertAction = #"Show me";
//notif.repeatInterval = 0;
//notif.soundName = UILocalNotificationDefaultSoundName;
notif.soundName = musicName;
notif.applicationIconBadgeNumber = 1;
NSDictionary *userDict = [NSDictionary dictionaryWithObject:#"saravanan"
forKey:kRemindMeNotificationDataKey];
notif.userInfo = userDict;
[[UIApplication sharedApplication] scheduleLocalNotification:notif];
[notif release];
}
}
}

Answer 1

The set button is wired up to run a
method called
scheduleNotification in the
view controller which uses the
UILocalNotification class to
schedule a notification. The code
looks as follows:
(void )scheduleNotification
{
[reminderText resignFirstResponder];
[[ UIApplication sharedApplication] cancelAllLocalNotifications];
Class cls = NSClassFromString(# "UILocalNotification" );
if (cls != nil)
{
UILocalNotification *notif = [[cls alloc] init];
notif.fireDate = [datePicker date];
notif.timeZone = [ NSTimeZone defaultTimeZone];
notif.alertBody = # "Did you forget something?" ;
notif.alertAction = # "Show me" ;
notif.soundName = UILocalNotificationDefaultSoundName ;
notif.applicationIconBadgeNumber = 1 ;
NSDictionary *userDict = [ NSDictionary dictionaryWithObject:reminderText.text
forKey:kRemindMeNotificationDataKey];
notif.userInfo = userDict;
[[ UIApplication sharedApplication] scheduleLocalNotification:notif];
[notif release];
}
}