CustomAccessoryViewController.m

/*
     File: CustomAccessoryViewController.m
 Abstract: The table view controller for the Custom Accessory tab.  It Manages
 a table view where each cell contains a checkbox control on the left side
 of a custom table view cell.
 
  Version: 1.4
 
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 */
 
#import "CustomAccessoryViewController.h"
#import "CustomCell.h"
#import "DetailViewController.h"
 
@interface CustomAccessoryViewController ()
//! Product listings from the TableData plist file.
@property (nonatomic, strong) NSMutableArray *dataArray;
@end
 
 
@implementation CustomAccessoryViewController
 
//| ----------------------------------------------------------------------------
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // Load our data from a plist file inside our app bundle.
    NSString *path = [[NSBundle mainBundle] pathForResource:@"TableData" ofType:@"plist"];
    self.dataArray = [NSMutableArray arrayWithContentsOfFile:path];
}
 
 
//| ----------------------------------------------------------------------------
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    // Reload the table when we return to the screen.  The "checked" property of
    // an item may have been altered by the DetailViewController.
    [self.tableView reloadData];
}
 
#pragma mark -
#pragma mark UITableViewDataSource
 
//| ----------------------------------------------------------------------------
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return (NSInteger)[self.dataArray count];
}
 
 
//| ----------------------------------------------------------------------------
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *kCustomCellID = @"CustomCell";
    
    CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:kCustomCellID];
    
    NSDictionary *item = self.dataArray[(NSUInteger)indexPath.row];
    
    cell.titleLabel.text = item[@"text"];
    cell.checkBox.checked = [item[@"checked"] boolValue];
    
    // Accessibility
    [self updateAccessibilityForCell:cell];
    
    return cell;
}
 
#pragma mark - 
#pragma mark UITableViewDelegate
 
//| ----------------------------------------------------------------------------
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Find the cell being touched and update its checked/unchecked image.
    CustomCell *targetCustomCell = (CustomCell *)[tableView cellForRowAtIndexPath:indexPath];
    targetCustomCell.checkBox.checked = !targetCustomCell.checkBox.checked;
    
    // Don't keep the table selection.
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    
    // Update our data source array with the new checked state.
    NSMutableDictionary *selectedItem = self.dataArray[(NSUInteger)indexPath.row];
    selectedItem[@"checked"] = @(targetCustomCell.checkBox.checked);
    
    // Accessibility
    [self updateAccessibilityForCell:targetCustomCell];
}
 
 
//| ----------------------------------------------------------------------------
//! IBAction that is called when the value of a checkbox in any row changes.
//
- (IBAction)checkBoxTapped:(id)sender forEvent:(UIEvent*)event
{
    NSSet *touches = [event allTouches];
    UITouch *touch = [touches anyObject];
    CGPoint currentTouchPosition = [touch locationInView:self.tableView];
    
    // Lookup the index path of the cell whose checkbox was modified.
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:currentTouchPosition];
    
    if (indexPath != nil)
    {
        // Update our data source array with the new checked state.
        NSMutableDictionary *selectedItem = self.dataArray[(NSUInteger)indexPath.row];
        selectedItem[@"checked"] = @([(Checkbox*)sender isChecked]);
    }
    
    // Accessibility
    [self updateAccessibilityForCell:(CustomCell*)[self.tableView cellForRowAtIndexPath:indexPath]];
}
 
//| ----------------------------------------------------------------------------
//  This will be called when the accessory button in one of the cells is tapped.
//
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"DetailViewSegue"]) {
        DetailViewController *destination = (DetailViewController*)segue.destinationViewController;
        
        NSIndexPath *selectedIndexPath = [self.tableView indexPathForCell:sender];
        
        destination.item = self.dataArray[(NSUInteger)selectedIndexPath.row];
    }
}
 
#pragma mark -
#pragma mark Accessibility
 
//| ----------------------------------------------------------------------------
//! Utility method for configuring a cell's accessibilityValue based upon the
//! current checkbox state.
//
- (void)updateAccessibilityForCell:(CustomCell*)cell
{
    // The cell's accessibilityValue is the Checkbox's accessibilityValue.
    cell.accessibilityValue = cell.checkBox.accessibilityValue;
    
    cell.checkBox.accessibilityLabel = cell.titleLabel.text;
}
 
@end