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Dec 30, 2010

How to Add Remove or Move a Cell in UITableView ?

This code is used for Add, Remove or Move a Cell in UITableView.



You can download source code from here Download.

Code for .h file

#import

@interface DeleteRowViewController : UIViewController
{
    IBOutlet UITableView *Table;
    NSMutableArray *arry;
}

- (IBAction) EditTable:(id)sender;
@end



Code for .m file.


#import "DeleteRowViewController.h"
@implementation DeleteRowViewController

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    arry = [[NSMutableArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",@"Five",nil];
    self.title = @"Edit Table ";
    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithTitle:@"Edit" style:UIBarButtonItemStyleBordered target:self action:@selector(EditTable:)];
    [self.navigationItem setLeftBarButtonItem:addButton];
    [super viewDidLoad];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
}


- (void)dealloc
{
    [super dealloc];
}

#pragma mark Table view methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
  
    return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    int count = [arry count];
    if(self.editing) count++;
    return count;
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    }
    int count = 0;
    if(self.editing && indexPath.row != 0)
        count = 1;
    NSLog([NSString stringWithFormat:@"%i,%i",indexPath.row,(indexPath.row-count)]);
  
    // Set up the cell...
    if(indexPath.row == ([arry count]) && self.editing)
    {
        cell.textLabel.text = @"ADD";
        return cell;
    }

    cell.textLabel.text = [arry objectAtIndex:indexPath.row];
    return cell;
}
- (IBAction)AddButtonAction:(id)sender
{
    [arry addObject:@"Tutorial "];
    [Table reloadData];
}

- (IBAction)DeleteButtonAction:(id)sender
{
    [arry removeLastObject];
    [Table reloadData];
}

- (IBAction) EditTable:(id)sender
{
    if(self.editing)
    {
        [super setEditing:NO animated:NO];
        [Table setEditing:NO animated:NO];
        [Table reloadData];
        [self.navigationItem.leftBarButtonItem setTitle:@"Edit"];
        [self.navigationItem.leftBarButtonItem setStyle:UIBarButtonItemStylePlain];
    }
    else
    {
        [super setEditing:YES animated:YES];
        [Table setEditing:YES animated:YES];
        [Table reloadData];
        [self.navigationItem.leftBarButtonItem setTitle:@"Done"];
        [self.navigationItem.leftBarButtonItem setStyle:UIBarButtonItemStyleDone];
    }
}

// The editing style for a row is the kind of button displayed to the left of the cell when in editing mode.
- (UITableViewCellEditingStyle)tableView:(UITableView *)aTableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // No editing style if not editing or the index path is nil.
    if (self.editing == NO || !indexPath) return UITableViewCellEditingStyleNone;
    // Determine the editing style based on whether the cell is a placeholder for adding content or already
    // existing content. Existing content can be deleted.  
    if (self.editing && indexPath.row == ([arry count]))
    {
        return UITableViewCellEditingStyleInsert;
    } else
    {
        return UITableViewCellEditingStyleDelete;
    }
    return UITableViewCellEditingStyleNone;
}

// Update the data model according to edit actions delete or insert.
- (void)tableView:(UITableView *)aTableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath
{
  
    if (editingStyle == UITableViewCellEditingStyleDelete)
    {
        [arry removeObjectAtIndex:indexPath.row];
        [Table reloadData];
    } else if (editingStyle == UITableViewCellEditingStyleInsert)
    {
        [arry insertObject:@"New Row" atIndex:[arry count]];
        [Table reloadData];
    }
}

#pragma mark Row reordering
// Determine whether a given row is eligible for reordering or not.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;
}
// Process the row move. This means updating the data model to correct the item indices.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath
      toIndexPath:(NSIndexPath *)toIndexPath
{
    NSString *item = [[arry objectAtIndex:fromIndexPath.row] retain];
    [arry removeObject:item];
    [arry insertObject:item atIndex:toIndexPath.row];
    [item release];
}

@end




4 comments:

  1. [arry insertObject:@"New Row" atIndex:[arry count]];

    should be written as

    [arry addObject:@"New Row"];

    ReplyDelete
  2. add object place it into last position, where as insert object place it to a particular index position.

    ReplyDelete
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