Question

我有一个包含NSDate属性的对象数组。我正在UITableView成功填充它们。

我想根据月份在UITableView个部分中分发它们（对象）。

我该怎么做？

Answer 1

请查看此代码一次。它可能对您有帮助。

NSMutableDictionary * dictArrData; //declare dictionary global

-(void)createHederAndCellArray
{
    dictArrData=[[NSMutableDictionary alloc]init];

    for(int i=0;i<arrHistory.count;i++)
    {
       yourObject *pastorders=[arrHistory objectAtIndex:i];
       if([dictArrData objectForKey:pastorders.paymentDate])
       {
          NSMutableArray *arrTemp=[dictArrData objectForKey:pastorders.paymentDate];
          [arrTemp addObject:pastorders];
          [dictArrData setObject: arrTemp forKey:pastorders.paymentDate];
       }
       else
       {
          NSMutableArray * arrTemp = [[NSMutableArray alloc]init];
          [arrTemp  addObject:pastorders];
         [dictArrData setObject: arrTemp forKey:pastorders.paymentDate];
       }
   }
   NSLog(@“check dictionary %@",[dictArrData description]);
}

[self createHederAndCellArray]; ----＆gt;在数组中添加数据后需要调用此方法，而不是在tableview中设置代码，如下所示。

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [dictArrData allKeys].count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{   
    NSArray *allValues=(NSArray*)[dictArrData objectForKey:[[dictArrData allKeys] objectAtIndex:section]];
   return [allValues count];
}

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
   UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 22, tableView.frame.size.width,15)];
  UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, tableView.frame.size.width,25)];

  [label setFont:[UIFont systemFontOfSize:14]];
  label.textAlignment=NSTextAlignmentLeft;
  label.textColor=[UIColor whiteColor];
  NSString *sectionTitle=[NSString stringWithFormat:@"%@" ,[[dictArrData allKeys]  objectAtIndex:section]];
  NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
  dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
  NSDate *date  = [dateFormatter dateFromString:sectionTitle];
  dateFormatter.dateFormat = @“MMM";
  NSString *sectionTitle =[NSString stringWithFormat:@"    %@",     [dateFormatter stringFromDate:date]];
  [view addSubview:imgvw];
  [view addSubview:label];
  [label setText:sectionTitle];
  return view;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {

    yourcell *cell = [tableView dequeueReusableCellWithIdentifier:@“yourcellidentifier” forIndexPath:indexPath];
   if (cell == nil)
   {
      cell = [[yourcell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"yourcellidentifier"];
   }
   @try
   {
        //keyArr=[self sortKeyAccordingTodate];
        NSArray *allValues=[dictArrData objectForKey:[[dictArrData allKeys] objectAtIndex:indexPath.section]];
        if(allValues.count >0 )
        {
            yourObject *pastorder=[allValues objectAtIndex:indexPath.row];
            cell.lblProductname.text=pastorder.itemName;
        }
   }    
   @catch (NSException *exception) {
      NSLog(@"Exception :%@",exception.description);
   }
    return cell;
}

 - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
   return 25;
}

根据日期排序，而不是排序字典键。

  -(NSArray *)sortKeyAccordingTodate
  { 
        NSArray* sorted  = [[dictArrData allKeys] sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2)
                   {
                       NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
                       dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
                       NSDate *date  = [dateFormatter dateFromString:obj1];
                       NSDate *date1  = [dateFormatter dateFromString:obj2];

                       if (date > date1) {
                           return (NSComparisonResult)NSOrderedAscending;
                       }
                       if (date < date1) {
                           return (NSComparisonResult)NSOrderedDescending;
                       }
                       return (NSComparisonResult)NSOrderedSame;
                   }];
return sorted;
}

如果你使用排序方法而不是你需要使用 [self sortKeyAccordingTodate] 而不是 [dictArrData allKeys]

希望这会对你有所帮助:)。

Answer 2

您可以使用以下代码对对象（例如Person）进行分组：

NSMutableArray * arrObjects = [NSMutableArray new];

for (int i=0;i<12;i++) {
    Person* p1 = [Person new];
    p1.name = [NSString stringWithFormat:@"ABC %d", i+1];
    p1.date = [[NSDate date] dateByAddingTimeInterval:60*60*24*30*i];
    [arrObjects addObject:p1];
}

// add blank arrays for 12 months
NSMutableArray* matrixObjects = [NSMutableArray new];
for (int i=0; i<12; i++) {
    [matrixObjects addObject:[NSMutableArray new]];
}

NSCalendar* calendar = [NSCalendar currentCalendar];
for (Person* p in arrObjects) {

    int month = (int) [[calendar components:NSCalendarUnitMonth fromDate:p.date] month];
    [matrixObjects[month-1] addObject:p];

}

// print resutls
for (int i=0; i<matrixObjects.count; i++) {
    NSLog(@"Objects in Section %d", i);
    for (Person* p in matrixObjects[i]) {

        NSLog(@"  ROW: %@ %@", p.name, p.date.description);
    }
}

其中输出如下：

Objects in Section 0
  ROW: ABC 11 2017-01-29 11:55:49 +0000
Objects in Section 1
  ROW: ABC 12 2017-02-28 11:55:49 +0000
Objects in Section 2
Objects in Section 3
  ROW: ABC 1 2016-04-04 11:55:49 +0000
Objects in Section 4
  ROW: ABC 2 2016-05-04 11:55:49 +0000
Objects in Section 5
  ROW: ABC 3 2016-06-03 11:55:49 +0000
Objects in Section 6
  ROW: ABC 4 2016-07-03 11:55:49 +0000
Objects in Section 7
  ROW: ABC 5 2016-08-02 11:55:49 +0000
Objects in Section 8
  ROW: ABC 6 2016-09-01 11:55:49 +0000
Objects in Section 9
  ROW: ABC 7 2016-10-01 11:55:49 +0000
  ROW: ABC 8 2016-10-31 11:55:49 +0000
Objects in Section 10
  ROW: ABC 9 2016-11-30 11:55:49 +0000
Objects in Section 11
  ROW: ABC 10 2016-12-30 11:55:49 +0000

matrixObjects 是12个月对象数组的数组，您可以在 numberOfSections 和 numberOfRows 委托方法中使用

如何根据Month - iOS制作UITableView部分

2 个答案: