For循环从核心数据

Question

我有一个问题，我有2个数组（日期和descriere），一个是保持日期，我从datePicker中选择另一个是一个字符串数组，两个数组都从CoreData中获取。

-(void)generateLocalNotification { 
    CoreDataStack *coreDataStack = [CoreDataStack defaultStack]; 
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"AddEntrySettings"]; 
    fetchRequest.resultType = NSDictionaryResultType; 
    NSArray *result = [coreDataStack.managedObjectContext executeFetchRequest:fetchRequest error:nil]; 
    NSMutableArray *date = [result valueForKey:@"date"]; 
    NSMutableArray *descriere = [result valueForKey:@"descriere"];` 

    if (date != nil) { 
     for (NSString *stringDate in date) { 
      NSDateFormatter *format = [[NSDateFormatter alloc]init]; 
      [format setDateFormat:@"MM/dd/yyyy h:mm a"]; 
      [format setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]]; 
      self.date = [format dateFromString:stringDate]; 
      NSLog(@"LOG:%@",date); 
      localNotification.fireDate = [self.date dateByAddingTimeInterval:0]; 
      localNotification.timeZone = [NSTimeZone timeZoneWithName:@"GMT"]; 

      for (int i = 0; i < descriere.count; i++) { 
       localNotification.alertBody = descriere[i]; 
      } 
      localNotification.applicationIconBadgeNumber = 1; 
      localNotification.soundName = UILocalNotificationDefaultSoundName; 
      localNotification.userInfo = @{@"id" : @42}; 

      UIApplication *app = [UIApplication sharedApplication]; 
      [app scheduleLocalNotification:localNotification]; 
     } 
    } 
} 

当我尝试fireDate一切正常，每次当从阵列中的日期与本地时间匹配的时候，我收到通知，直到我尝试添加alertBody，当我做一个for循环每次alertBody显示我的NSArray的最后一个条目。在CoreData中，我在同一时间添加的两个条目。我的错误在哪里？我怎样才能让每一次都收到alertBody与我在CoreData中插入的日期相匹配的通知？

Answer 1

的问题是，这个for循环：

 for (int i = 0; i < descriere.count; i++) { 
      localNotification.alertBody = descriere[i]; 
     } 

会，为每一位stringDate，迭代在你descriere阵列中的最后一项。你想要的是在date中找到stringDate的索引，然后在descriere中找到相同索引处的字符串。

但有一个更简单的方法。不要解压result成两个独立的阵列，从内刚刚访问不同的值循环：

if (result != nil) { 
    for (NSDictionary *dict in result) { 
     NSString *stringDate = [dict objectForKey:@"date"]; 
     // if necessary, test whether stringDate is nil here 
     NSDateFormatter *format = [[NSDateFormatter alloc]init]; 
     [format setDateFormat:@"MM/dd/yyyy h:mm a"]; 
     [format setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]]; 
     self.date = [format dateFromString:stringDate]; 
     NSLog(@"LOG:%@",date); 
     localNotification.fireDate = [self.date dateByAddingTimeInterval:0]; 
     localNotification.timeZone = [NSTimeZone timeZoneWithName:@"GMT"]; 

     localNotification.alertBody = [dict objectForKey:@"descriere"];   
     localNotification.applicationIconBadgeNumber = 1; 
     localNotification.soundName = UILocalNotificationDefaultSoundName; 
     localNotification.userInfo = @{@"id" : @42}; 

     UIApplication *app = [UIApplication sharedApplication]; 
     [app scheduleLocalNotification:localNotification]; 
    } 
}