Sending a data model between UITableViewControllers - ios

Question

I know there are already lots of questions about this but none of them have helped me yet. I have two UITableViewControllers. I want to push a QuicklistViewController (using this like a quick menu to list different shows) onto a CurrentShowViewController.
I have a Show model that only contains a name property right now. I am have trouble moving the data from my selection in QuicklistViewController to the CurrentShowViewController so that I can display the currentShow information there.
I am totally stuck on how I can do this.Please help!
Here is my CurrentShowViewController:
#import "CurrentShowViewController.h"
#import "QuicklistViewController.h"
#interface CurrentShowViewController ()
#end
#implementation CurrentShowViewController
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
self.tabBarItem.image = [UIImage imageNamed:#"tab_icon_episodes.png"];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
//self.navigationItem.rightBarButtonItem = self.editButtonItem;
// Add a UIBarButton button that will display a Quicklist Modal View
UIBarButtonItem *quicklistButton = [[UIBarButtonItem alloc] initWithTitle:#"Quicklist"
style:UIBarButtonItemStylePlain
target:self
action:#selector(quicklistButtonPressed)];
self.navigationItem.leftBarButtonItem = quicklistButton;
self.currentShow = [[Show alloc] init];
NSLog(#"Current show name is: %#", self.currentShow.name);
self.title = self.currentShow.name;
}
- (void) viewWillAppear:(BOOL)animated {
self.title = self.currentShow.name;
}
- (void) quicklistButtonPressed {
QuicklistViewController *quicklistVC = [[QuicklistViewController alloc] init];
[self.navigationController pushViewController:quicklistVC animated:YES];
}
Here is my QuicklistViewController:
#import "QuicklistViewController.h"
#import "CurrentShowViewController.h"
#interface QuicklistViewController ()
#end
#implementation QuicklistViewController
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
self.title = #"Quicklist";
self.tabBarItem.image = [UIImage imageNamed:#"tab_icon_quicklist.png"];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:#"Back"
style:UIBarButtonItemStylePlain
target:self
action:#selector(backButtonPressed)];
self.navigationItem.leftBarButtonItem = backButton;
// Create a temp array of Show objects filled with test data
NSMutableArray *temp= [[NSMutableArray alloc] init];
[temp addObject:[[Show alloc] initWithName:#"The Walking Dead"]];
[temp addObject:[[Show alloc] initWithName:#"How I Met Your Mother"]];
[temp addObject:[[Show alloc] initWithName:#"Grey's Anatomy"]];
[temp addObject:[[Show alloc] initWithName:#"The Mentalist"]];
[temp addObject:[[Show alloc] initWithName:#"Stargate SG1"]];
NSArray *testShows = [[NSArray alloc] initWithArray:temp];
self.shows = testShows;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
self.currentShow = [[Show alloc] init];
}
- (void) backButtonPressed {
//Archive changes to currentShow object
[Show saveShow:self.currentShow];
[self.navigationController popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.shows count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
cell.textLabel.text = [self.shows[indexPath.row] name];
return cell;
}
- (void) tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// Change the current show to the selected show
self.currentShow = self.shows[indexPath.row];
//Archive changes to currentShow object
[Show saveShow:self.currentShow];
}

Answer 1

Use delegation.
CurrentShowViewController
- (void) quicklistButtonPressed
{
QuicklistViewController *quicklistVC = [[QuicklistViewController alloc] init];
quicklistVC.delegate = self;
[self.navigationController pushViewController:quicklistVC animated:YES];
}
- (void) selectedShow:(Show) show
{
// show : current show
}
QuicklistViewController
#protocol QuicklistViewControllerDelegate
- (void) selectedShow:(Show) show
#end
#property (nonatomic, weak) id delegate;
- (void) backButtonPressed
{
//Archive changes to currentShow object
[Show saveShow:self.currentShow];
[delegate selectedShow:self.currentShow];
[self.navigationController popViewControllerAnimated:YES];
}

Answer 2

You've mistakenly implemented didDeselectRowAtIndexPath instead of didSelectRowAtIndexPath.