I am allowing users to choose a date from UIDatePicker
view and then the title of the UITableView
will show the dates from the picker view . My question is, is it possible for the UITableView
to rearrange the items from old to new according to the date of the UITableView
title automatically and reload the table?
Here are my code,
@interface PictureListMainTable : UITableViewController{
}
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (strong, nonatomic) NSMutableArray *pictureListData;
- (void)readDataForTable;
@end
@synthesize managedObjectContext, pictureListData;
@synthesize scroll;
- (void)viewWillAppear:(BOOL)animated
{
// Repopulate the array with new table data
[self readDataForTable];
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd.MMMM - EEEE"];
NSDate *today = [NSDate date];
[pictureListData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
Pictures *picture = (Pictures *)obj;
NSDate *date = [dateFormatter dateFromString:picture.title];
NSDateComponents *components = [cal components:NSDayCalendarUnit
fromDate:date
toDate:today
options:0];
if ([components day]==0) {
*stop = TRUE;
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection:0];
[self.tableView scrollToRowAtIndexPath:indexPath
atScrollPosition:UITableViewScrollPositionTop
animated:YES];
}
}];
}
// When the view reappears, read new data for table
// Grab data for table - this will be used whenever the list appears or reappears after an add/edit
- (void)readDataForTable
{
// Grab the data
pictureListData = [CoreDataHelper getObjectsForEntity:@"Pictures" withSortKey:@"title" andSortAscending:YES andContext:managedObjectContext];
// Force table refresh
[self.tableView reloadData];
}
#pragma mark - Actions
// Button to log out of app (dismiss the modal view!)
#pragma mark - Segue methods
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get a reference to our detail view
PictureListDetail *pld = (PictureListDetail *)[segue destinationViewController];
// Pass the managed object context to the destination view controller
pld.managedObjectContext = managedObjectContext;
// If we are editing a picture we need to pass some stuff, so check the segue title first
if ([[segue identifier] isEqualToString:@"EditPicture"])
{
// Get the row we selected to view
NSInteger selectedIndex = [[self.tableView indexPathForSelectedRow] row];
// Pass the picture object from the table that we want to view
pld.currentPicture = [pictureListData objectAtIndex:selectedIndex];
}
}
#pragma mark - Table view data source
// Return the number of sections in the table
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
// Return the number of rows in the section (the amount of items in our array)
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [pictureListData count];
}
// Create / reuse a table cell and configure it for display
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Get the core data object we need to use to populate this table cell
Pictures *currentCell = [pictureListData objectAtIndex:indexPath.row];
// Fill in the cell contents
cell.textLabel.text = [currentCell title];
cell.detailTextLabel.text = [currentCell desc];
// If a picture exists then use it
if ([currentCell smallPicture])
{
cell.imageView.contentMode = UIViewContentModeScaleAspectFit;
cell.imageView.image = [UIImage imageWithData:[currentCell smallPicture]];
}
return cell;
}
// Swipe to delete has been used. Remove the table item
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
// Get a reference to the table item in our data array
Pictures *itemToDelete = [self.pictureListData objectAtIndex:indexPath.row];
// Delete the item in Core Data
[self.managedObjectContext deleteObject:itemToDelete];
// Remove the item from our array
[pictureListData removeObjectAtIndex:indexPath.row];
// Commit the deletion in core data
NSError *error;
if (![self.managedObjectContext save:&error])
NSLog(@"Failed to delete picture item with error: %@", [error domain]);
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
@end
Thanks.