ios如何实现重复提醒？

 
//发送通知
    UILocalNotification *notification=[[UILocalNotification alloc] init];   
    if (notification!=nil) { 
        NSDate *now=[NSDate new]; 
        notification.fireDate=[now dateByAddingTimeInterval:10];//10秒后通知
        notification.repeatInterval=0;//循环次数，kCFCalendarUnitWeekday一周一次
        notification.timeZone=[NSTimeZone defaultTimeZone];
        notification.applicationIconBadgeNumber=1; //应用的红色数字 
        notification.soundName= UILocalNotificationDefaultSoundName;//声音，可以换成alarm.soundName = @"myMusic.caf" 
        //去掉下面2行就不会弹出提示框
         notification.alertBody=@"通知内容";//提示信息 弹出提示框
         notification.alertAction = @"打开";  //提示框按钮 
        //notification.hasAction = NO; //是否显示额外的按钮，为no时alertAction消失
 
       // NSDictionary *infoDict = [NSDictionary dictionaryWithObject:@"someValue" forKey:@"someKey"];
        //notification.userInfo = infoDict; //添加额外的信息
         
        [[UIApplication sharedApplication] scheduleLocalNotification:notification];      
    }
    [notification release];