iOS 定时发本地push 实现

 //取消之前所有的本地通知
     [[UIApplication sharedApplication] cancelAllLocalNotifications];

     //清空 icon数量
     [UIApplication sharedApplication].applicationIconBadgeNumber = 0;


     //启动本地通知
     UILocalNotification *notification=[[UILocalNotification alloc] init];
     if (notification!=nil)
     {
         //现在的时间
         NSDate *now=[NSDate date];


         //获得系统日期
         NSCalendar  * cal=[NSCalendar  currentCalendar];
         NSUInteger  unitFlags=NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit;
         NSDateComponents * conponent= [cal components:unitFlags fromDate:now];
         NSInteger year=[conponent year];
         NSInteger month=[conponent month];
         NSInteger day=[conponent day];
         //NSString *  nsDateString= [NSString  stringWithFormat:@"%4d年%2d月%2d日",year,month,day];



         //获得当天的12:00  时间
         NSString  * nsStringDate12 =  [NSString  stringWithFormat:@"%d-%d-%d-%d-%d-%d",
                             year, month,day, 12, 0, 0  ];

         //根据时间字符串获得NSDate
         NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];
         [dateformatter setDateFormat:@"YYYY-MM-dd-HH-mm-ss"];
         NSDate  * todayTwelve=[dateformatter dateFromString:nsStringDate12];

         //然后比较  now跟  todayTwelve那个大，如果已经过了12点，那就设置明天12点
         NSComparisonResult   dateResult =  [now  compare:todayTwelve ];
         if (dateResult ==  NSOrderedDescending  )
         {
             NSDate  *  tomorrowTwelve =  [todayTwelve  dateByAddingTimeInterval: 24 * 60 * 60];

             notification.fireDate =  tomorrowTwelve;
         }
         else
         {
             notification.fireDate= todayTwelve;
         }
         notification.repeatInterval = kCFCalendarUnitDay;
         notification.timeZone=[NSTimeZone defaultTimeZone];
         notification.applicationIconBadgeNumber = 1;

         notification.alertBody=@"今天还没上线，好多奖励没领呢";

         notification.alertAction = @"打开";
         [[UIApplication sharedApplication]   scheduleLocalNotification:notification];
         [notification release];
     }

 - (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
 {
     NSLog(@"获得本地通知");


     //点击提示框的打开
     application.applicationIconBadgeNumber = 0;


 }