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POPersisting Checklists on a UITableView using NSUserDefults
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  1. POPersisting Checklists on a UITableView using NSUserDefults
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    copied!<p>I have a very simple table view which shows a list of days. Once the user selects which days are relevant to them this data is saved in NSUserdefaults. I then need the check marks to remain once the user has exited then re-entered the table view. </p> <p>I am very close to getting my desired functionality - I can save the array of check marked items and get it to persist using NSUserDefaults but I don't know how to make these selections persist (keep a check mark next to the selected item) once a user has exited then re-entered the table view. </p> <p>I know that I need to edit the <strong>cellForRowAtIndexPath</strong> method but I am not sure exactly what to do. Any help would be greatly appreciated.</p> <p>I have attached my code below:</p> <pre><code>#import "DayView.h" @implementation DayView @synthesize sourceArray; @synthesize selectedArray; - (id)init { self = [super initWithStyle:UITableViewStyleGrouped]; if (self) { // Custom initialization [[self navigationItem] setTitle:@"Days"]; [[self tableView] setBackgroundColor:[UIColor clearColor]]; } return self; } - (void)viewWillDisappear:(BOOL)animated { // create a standardUserDefaults variable NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults]; // Convert array to string NSString *time = [[selectedArray valueForKey:@"description"] componentsJoinedByString:@","]; // saving an NSString [standardUserDefaults setObject:time forKey:@"string"]; NSLog(@"Disapear: %@", time); } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; // create a standardUserDefaults variable NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults]; // getting an NSString object NSString *myString = [standardUserDefaults stringForKey:@"string"]; NSLog(@"Appear: %@", myString); NSMutableArray * tempArray = [[NSMutableArray alloc] init]; [self setSelectedArray:tempArray]; [tempArray release]; NSArray * tempSource = [[NSArray alloc] initWithObjects:@"Monday", @"Tuesday", @"Wednesday", @"Thursday", @"Friday", @"Saturday",nil]; [self setSourceArray:tempSource]; [tempSource release]; [self.tableView reloadData]; } #pragma mark - #pragma mark Table view data source // Customize the number of sections in the table view. - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.sourceArray 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] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } NSString *time = [sourceArray objectAtIndex:indexPath.row]; cell.textLabel.text = time; if ([self.selectedArray containsObject:[self.sourceArray objectAtIndex:indexPath.row]]) { [cell setAccessoryType:UITableViewCellAccessoryCheckmark]; } else { [cell setAccessoryType:UITableViewCellAccessoryNone]; } NSLog(@"Selected Days: %@", selectedArray); return cell; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return @"Which times you are available?"; } #pragma mark - #pragma mark Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { if ([self.selectedArray containsObject:[self.sourceArray objectAtIndex:indexPath.row]]){ [self.selectedArray removeObjectAtIndex:[self.selectedArray indexOfObject: [self.sourceArray objectAtIndex:indexPath.row]]]; } else { [self.selectedArray addObject:[self.sourceArray objectAtIndex:indexPath.row]]; } [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationNone]; [tableView deselectRowAtIndexPath:indexPath animated:YES]; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } @end </code></pre>
 

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