- (void)viewDidLoad {
    [super viewDidLoad];
 
    // create & set Edit button    
    UIBarButtonItem *actionButton = 
     [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit 
                                                   target:self 
                                                   action:@selector(edit:)];
    [[self navigationItem] setRightBarButtonItem:actionButton];
    [actionButton release];
    ...
}
 
- (IBAction)edit:(id)aSender {
 
    OrderEditorController *editor = 
      [[[OrderEditorController alloc] initWithStyle:UITableViewStyleGrouped] autorelease];
 
    // set OrderViewController as the delegate to be able to notify it about the results of the editing process
    [editor setDelegate:self];
 
    // find the currently selected row
    NSIndexPath *path = [self.tableView indexPathForSelectedRow];
    NSInteger idx = [path indexAtPosition:1];
    DADataTableRow *row = [orderRows objectAtIndex:idx];
 
    // and set it for our editor 
    [editor setOrderRow:row];
 
    // push the editor view to be a topmost view
    [[self navigationController] pushViewController:editor animated:YES];
}
 
// delegate the method that the editor will call for applying changes
-(void)endEditWithOk:(DADataTableRow *)row {
    // applying changes on Relativity server
    [[DataAccess sharedInstance] applyUpdatesForTable:[row table]];
    // reload view for synchronizing client-side data
    [[self tableView] reloadData];
}
 
// delegate the method that the editor will call for canceling changes
-(void)endEditWithCancel:(DADataTableRow *)row {
    // cancel the change
    [row cancel];
    // reload table
    [[self tableView] reloadData];
}

/////////////////////////////
//  DataAccess.h
@interface DataAccess : NSObject <DARemoteDataAdapterDelegate, DAAsyncRequestDelegate>
{
    ...
    NSArray *orderStatusNames;
}
...
@property (readonly) NSArray *orderStatusNames;
-(NSUInteger)idForOrderStatusName:(NSString *)name;
-(NSString *)nameForOrderStatus:(NSUInteger)status;
@end
 
/////////////////////////////
//  DataAccess.m
 
- (id) init {
	self = [super init];
	if (self) {
		...
 
        orderStatusNames = [[NSArray alloc] initWithObjects:
                         @"New", 
                         @"Pending", 
                         @"Closed", 
                         @"Deleted", 
                         nil];
 
	}
	return self;
}
 
- (void) dealloc {
   ...  
   [orderStatusNames release], orderStatusNames = nil;
   [super dealloc];
}
 
 
-(NSString *)nameForOrderStatus:(NSUInteger)status {
 
    if (status >= [orderStatusNames count])
        return @"Unknown state";
 
    return [orderStatusNames objectAtIndex:status];
}
 
-(NSUInteger)idForOrderStatusName:(NSString *)name { 
 
    for (NSUInteger i = 0; i < [orderStatusNames count]; i++) {
        NSString *statusName = [orderStatusNames objectAtIndex:i];
        if ([statusName compare:name] == NSOrderedSame) 
            return i;
    }
    return 0;
}
 
-(NSArray *)orderStatusNames {
 
    return orderStatusNames;
}

@interface OrderEditorController : UITableViewController {
 
    DADataTableRow *orderRow;
 
    UIBarButtonItem *saveButton;
    UIBarButtonItem *cancelButton;
 
    id delegate;
    NSDateFormatter *df; 
}
 
@property (retain) DADataTableRow *orderRow;
@property (assign) id delegate;
 
- (IBAction)save:(id)aSender;
- (IBAction)cancel:(id)aSender;
@end

#pragma mark - View lifecycle
 
- (void)viewDidLoad {
    [super viewDidLoad];
 
    // create & add cancel button    
    cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" 
                                                    style:UIBarButtonItemStylePlain 
                                                   target:self action:@selector(cancel:)];
    self.navigationItem.leftBarButtonItem = cancelButton;
 
    // create & add save button    
    saveButton = [[UIBarButtonItem alloc] initWithTitle:@"Save" 
                                                  style:UIBarButtonItemStyleDone 
                                                 target:self action:@selector(save:)];
    self.navigationItem.rightBarButtonItem = saveButton;
 
    // we will also need this formatter for converting NSDate to NSString 
    df = [[NSDateFormatter alloc] init];
    [df setDateStyle:NSDateFormatterMediumStyle];
}
 
- (IBAction)save:(id)aSender {
 
    if ([delegate respondsToSelector:@selector(endEditWithOk:)])
        [delegate endEditWithOk:orderRow];
 
    [self.navigationController popViewControllerAnimated:YES];
 
}
 
- (IBAction)cancel:(id)aSender {
 
    if ([delegate respondsToSelector:@selector(endEditWithCancel:)])
        [delegate endEditWithCancel:orderRow];
 
    [self.navigationController popViewControllerAnimated:YES];
}

 
#pragma mark - Table view data source
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // we want to have two groups, 
    // one for OrderDate & OrderStatus, and one for the Client field 
    return 2;
}
 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    switch (section) {
        case 0:
            // the first section will have two cells (showing OrderDate & OrderStatus)
            return 2;
        case 1:
            // the second section will have a single cell (showing the Client field)
            return 1;
 
        default:
            return 0;
    }
}
 
static NSString *TABLE_CELL_ID = @"OrderEditorCell";
 
- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:TABLE_CELL_ID];
    if (cell == nil) {
      cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 
                                     reuseIdentifier:TABLE_CELL_ID] autorelease];
    }
 
    // Configure the cell...
    int section = [indexPath section];
    int index = [indexPath indexAtPosition:1];
    switch (section) {
      case 0: { // for the first section ...
        switch (index) {
          case 0: { // configure the cell to show the OrderDate field
                    [[cell textLabel] setText:@"Order Date:"];
                    NSDate *value = [orderRow valueForKey:@"OrderDate"];
                    NSString *valueAsString = value ? [df stringFromDate:value] : @"Click to select";
                    [[cell detailTextLabel] setText:valueAsString];
                    break;
          }
          case 1: { // configure the cell to show the OrderStatus field
                    [[cell textLabel] setText:@"Order Status:"];
                    NSNumber *value = [orderRow valueForKey:@"OrderStatus"];
                    NSString *valueAsString = value ? 
                         [[DataAccess sharedInstance] nameForOrderStatus:[value intValue]] : 
                         @"Click to select";
                    [[cell detailTextLabel] setText:valueAsString];
                    break;
          }
        }
        break;
      }
      case 1: { // for the second section
        switch (index) {
          case 0: { // configure the cell to show the Client field
                    [[cell textLabel] setText:@"Client:"];
                    NSString *value = [orderRow valueForKey:@"CustomerName"];
                    NSString *valueAsString = value ? value : @"Click to select";
                    [[cell detailTextLabel] setText:valueAsString];
                    break;
          }
        }
        break;
     }
     default:
       break;
    }
    [cell setNeedsDisplay];
	return cell;
}

- (void)viewDidLoad {
 
  ...
  // create & configure our DatePicker
  datePickerView = [[UIDatePicker alloc] init];
  [datePickerView setDatePickerMode:UIDatePickerModeDate];
  [datePickerView addTarget:self 
                     action:@selector(pickerDidChange) 
           forControlEvents:UIControlEventValueChanged];
 
  pickerDoneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                                                      style:UIBarButtonItemStyleDone 
                                                     target:self action:@selector(pickerDone)];
  pickerCancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" 
                                                        style:UIBarButtonItemStyleDone 
                                                       target:self action:@selector(pickerCancel)];
}
 
#pragma mark - Common picker routines
-(void)showPicker:(UIPickerView *)picker {
 
    if (!picker)
        return;
 
    if (activePicker) 
        [self hidePicker:activePicker];
 
    activePicker = picker;
 
    if (picker.superview == nil) {
        [self.view.window addSubview:picker];
 
        // size up the picker view to our screen and compute the start/end 
        // frame the origin for our slide-up animation
        // compute the start frame
        CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
        CGSize pickerSize = [picker sizeThatFits:CGSizeZero];
        CGRect startRect = CGRectMake(0.0,
                                      screenRect.origin.y + screenRect.size.height,
                                      pickerSize.width, pickerSize.height);
        picker.frame = startRect;
 
        // compute the end frame
        CGRect pickerRect = CGRectMake(0.0,
                                       screenRect.origin.y + screenRect.size.height - pickerSize.height,
                                       pickerSize.width,
                                       pickerSize.height);
        // start the slide-up animation
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
 
        // we need to perform some post operations after the animation is complete
        [UIView setAnimationDelegate:self];
 
        picker.frame = pickerRect;
 
        // shrink the table's vertical size to make room for the date picker
        CGRect newFrame = self.tableView.frame;
        newFrame.size.height -= picker.frame.size.height;
        self.tableView.frame = newFrame;
        [UIView commitAnimations];
 
        // add the "Done" & "Cancel" buttons to the nav bar
        self.navigationItem.rightBarButtonItem = pickerDoneButton;
        self.navigationItem.leftBarButtonItem = pickerCancelButton;
    }
}
 
-(void)removePicker:(UIPickerView *)picker {
 
    if (!picker)
        return;
 
    if (picker.superview != nil) {
        [picker removeFromSuperview];    
    }
}
 
-(void)hidePicker:(UIPickerView *)picker {
 
    if (!picker)
        return;
 
    activePicker = nil;
 
    CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
    CGRect endFrame = picker.frame;
    endFrame.origin.y = screenRect.origin.y + screenRect.size.height;
 
    // start the slide-down animation
    [UIView beginAnimations:nil context:picker];
    [UIView setAnimationDuration:0.3];
 
    // we need to perform some post operations after the animation is complete
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
 
    picker.frame = endFrame;
    [UIView commitAnimations];
 
    // grow the table back again in vertical size to make room for the date picker
    CGRect newFrame = self.tableView.frame;
    newFrame.size.height += picker.frame.size.height;
    self.tableView.frame = newFrame;
 
    // remove the "Done" button and restore the nav bar
    self.navigationItem.rightBarButtonItem = saveButton;
    self.navigationItem.leftBarButtonItem = cancelButton;
 
    // deselect the current table row
    //NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    //[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
 
}
 
-(void)animationDidStop:(NSString *)animationID 
               finished:(NSNumber *)finished 
                context:(void *)context {
    [self removePicker:context];
}
 
// called when we click the Done button
-(void)pickerDone {
 
    // change the data
    if (activePicker == (UIPickerView *)datePickerView)
        [orderRow setValue:datePickerView.date forKey:@"OrderDate"];
 
    // hide picker
    [self hidePicker:activePicker];
    // reload table view to show changes
    [[self tableView] reloadData];
}
 
// called when we click on the Done button
-(void)pickerCancel {
    // just hide the picker
    [self hidePicker: activePicker];
    [[self tableView] reloadData];
}
 
// the following method will sync the current picker value with the value in the table view
- (void)pickerDidChange {
 
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
 
    if (activePicker == (UIPickerView *)datePickerView)
        cell.detailTextLabel.text = [df stringFromDate:datePickerView.date];
}

- (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
 
    [self hidePicker:activePicker];
    int section = [indexPath section];
    int index = [indexPath indexAtPosition:1];
 
    switch (section) {
      case 0: {
        switch (index) {
          case 0: {
            datePickerView.date = [orderRow valueForKey:@"OrderDate"];
            [self showPicker:(UIPickerView *)datePickerView];
            break;
          }
          case 1: {
 
            break;
	  }
        }
      }
    }
}

- (void)viewDidLoad {
    ...    
    statePickerView = [[UIPickerView alloc] init];
    [statePickerView setDataSource:self];
    [statePickerView setDelegate:self];
    [statePickerView setShowsSelectionIndicator:YES];
}

 
#pragma mark - Custom Picker routines
 
// callback method for filling content for our custom statuses picker
- (NSString *)pickerView:(UIPickerView *)pickerView 
             titleForRow:(NSInteger)row 
            forComponent:(NSInteger)component {
 
    if (pickerView == statePickerView)
        return [[DataAccess sharedInstance] nameForOrderStatus:row];
    return @"";
}
 
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
 
    // it should be a simple picker with a single component
    if (pickerView == statePickerView)
        return 1;
    return 0;
}
 
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
 
    if (pickerView == statePickerView)
        return [[[DataAccess sharedInstance] orderStatusNames] count];
    return 0;
}

#pragma mark - Table view delegate
 
- (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
   ...    
    switch (section) {
      case 0: {
        switch (index) {
          case 0: {
            ...
          }
          case 1: {
            [self showPicker:statePickerView];
            break;
          }
        }
      }
    }
}