UILocalNotification实现本地的闹钟提醒的方法。

http://www.devdiv.com/thread-69786-1-1.html

UILocalNotification *notification=[[UILocalNotification alloc] init];
      if (notification!=nil)
      {

         NSDate *now=[NSDate new];

         //notification.fireDate=[now addTimeInterval:period];
         notification.fireDate = [now dateByAddingTimeInterval:period];
         NSLog(@"%d",period);
         notification.timeZone=[NSTimeZone defaultTimeZone];
         notification.soundName = @"ping.caf";
         //notification.alertBody=@"TIME！";

         notification.alertBody = [NSString stringWithFormat:@"@%时间到了!",nameStr];

         NSDictionary* info = [NSDictionary dictionaryWithObject:uniqueCodeStr forKey:CODE];
         notification.userInfo = info;

         [[UIApplication sharedApplication] scheduleLocalNotification:notification];

      }

设置的时间到了以后，会自动在桌面弹出一个提示框，点显示后，就可以启动软件。然后在
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UILocalNotification *localNotif = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
if (localNotif)
{
      NSLog(@"Recieved Notification %@",localNotif);
      NSDictionary* infoDic = localNotif.userInfo;
      NSLog(@"userInfo description=%@",[infoDic description]);
      NSString* codeStr = [infoDic objectForKey:CODE];
}
}里，对lanchOptions进行处理，找到它里面的信息,就可以拿到设置时的需要处理的东西，就可以继续操作了。

如果此时你的客户端软件仍在打开，则会调用
- (void)application:(UIApplication *)app didReceiveLocalNotification:(UILocalNotification *)notif
{

}
一样的处理方法。

在程序中取消已经设定的通知的方法了：
NSString *myIDToCancel = @"some_id_to_cancel";
UILocalNotification *notificationToCancel=nil;
for(UILocalNotification *aNotif in [[UIApplication sharedApplication] scheduledLocalNotifications])
{
if([aNotif.userInfo objectForKey:@"ID"] isEqualToString:myIDToCancel])
{
notificationToCancel=aNotif;
  break;
}
}
[[UIApplication sharedApplication] cancelLocalNotification:notificationToCancel];