Saving data in one view controller and displaying it in another - ios

Question

I am currently developing an app the needs to have an initial setting screen (name, date, amount of deposit, and percentage). I have created a view controller that will add and then save to core data. I can also retrieve the information.
What I need next is to be able to pop into another view controller and enter continuing number for the same person. Whenever i enter data into the second view controller it comes back as an addition as if it were a new person. I need some help to figure it out as i am still new and learning.
Below is the .h and .m files of the two view controllers.
ForexDetailViewController.h
#import <UIKit/UIKit.h>
#interface ForexDetailViewController : UIViewController
#property (weak, nonatomic) IBOutlet UITextField *nameTextField;
#property (weak, nonatomic) IBOutlet UITextField *startamountTextField;
#property (weak, nonatomic) IBOutlet UITextField *startmonthTextField;
#property (strong, nonatomic) IBOutlet UITextField *startpercentTextField;
#property (weak, nonatomic) IBOutlet UITextField *endmonth1year1TextField;
#property (weak, nonatomic) IBOutlet UITextField *endpercentmonth1year1TextField;
#property (strong) NSManagedObject *device;
- (IBAction)cancel:(id)sender;
- (IBAction)save:(id)sender;
- (IBAction)textFieldReturn:(id)sender;
- (IBAction)calcultae;
#end
ForexDetailViewController.m
#import "ForexDetailViewController.h"
#interface ForexDetailViewController ()
#end
#implementation ForexDetailViewController
- (IBAction)textFieldReturn:(id)sender
{
[sender resignFirstResponder];
}
#synthesize device;
- (NSManagedObjectContext *)managedObjectContext {
NSManagedObjectContext *context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:#selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
if (self.device) {
[self.nameTextField setText:[self.device valueForKey:#"name"]];
[self.startamountTextField setText:[self.device valueForKey:#"startamount"]];
[self.startmonthTextField setText:[self.device valueForKey:#"startmonth"]];
[self.startpercentTextField setText:[self.device valueForKey:#"startpercent"]];
[self.endmonth1year1TextField setText:[self.device valueForKey:#"endmonth1year1"]];
[self.endpercentmonth1year1TextField setText:[self.device valueForKey:#"endpercentmonth1year1"]];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)cancel:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (IBAction)save:(id)sender {
NSManagedObjectContext *context = [self managedObjectContext];
if (self.device) {
// Update existing device
[self.device setValue:self.nameTextField.text forKey:#"name"];
[self.device setValue:self.startamountTextField.text forKey:#"startamount"];
[self.device setValue:self.startmonthTextField.text forKey:#"startmonth"];
[self.device setValue:self.startpercentTextField.text forKey:#"startpercent"];
[self.device setValue:self.endmonth1year1TextField.text forKey:#"startpercent"];
[self.device setValue:self.endpercentmonth1year1TextField.text forKey:#"endpercentmonth1year1"];
} else {
// Create a new device
NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:#"Calculations" inManagedObjectContext:context];
[newDevice setValue:self.nameTextField.text forKey:#"name"];
[newDevice setValue:self.startamountTextField.text forKey:#"startamount"];
[newDevice setValue:self.startmonthTextField.text forKey:#"startmonth"];
[newDevice setValue:self.startpercentTextField.text forKey:#"startpercent"];
[newDevice setValue:self.endmonth1year1TextField.text forKey:#"endmonth1year1"];
[newDevice setValue:self.endpercentmonth1year1TextField.text forKey:#"endpercentmonth1year1"];
}
NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
NSLog(#"Can't Save! %# %#", error, [error localizedDescription]);
}
[self dismissViewControllerAnimated:YES completion:nil];
}
#end
TimeLineViewController.h
#import <UIKit/UIKit.h>
#interface TimeLineViewController : UIViewController
#property (weak, nonatomic) IBOutlet UITextField *startamountTextField;
#property (weak, nonatomic) IBOutlet UITextField *endmonth1year1TextField;
#property (weak, nonatomic) IBOutlet UITextField *endpercentmonth1year1TextField;
#property (strong) NSManagedObject *device;
- (IBAction)cancel:(id)sender;
- (IBAction)save:(id)sender;
- (IBAction)textFieldReturn:(id)sender;
#end
TimeLineViewController.m
#import "TimeLineViewController.h"
#interface TimeLineViewController ()
#end
#implementation TimeLineViewController
- (IBAction)textFieldReturn:(id)sender
{
[sender resignFirstResponder];
}
#synthesize device;
- (NSManagedObjectContext *)managedObjectContext {
NSManagedObjectContext *context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:#selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
if (self.device) {
[self.startamountTextField setText:[self.device valueForKey:#"startamount"]];
[self.endmonth1year1TextField setText:[self.device valueForKey:#"endmonthe1year1"]];
[self.endpercentmonth1year1TextField setText:[self.device valueForKey:#"endpercentmonth1year1"]];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)cancel:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (IBAction)save:(id)sender {
NSManagedObjectContext *context = [self managedObjectContext];
if (self.device) {
// Update existing device
[self.device setValue:self.startamountTextField.text forKey:#"startamount"];
[self.device setValue:self.endmonth1year1TextField.text forKey:#"endmonth1year1"];
[self.device setValue:self.endpercentmonth1year1TextField.text forKey:#"endpercentmonth1year1"];
} else {
// Create a new device
NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:#"Calculations" inManagedObjectContext:context];
[newDevice setValue:self.startamountTextField.text forKey:#"startamount"];
[newDevice setValue:self.endmonth1year1TextField.text forKey:#"endmonth1year1"];
[newDevice setValue:self.endpercentmonth1year1TextField.text forKey:#"endpercentmonth1year1"];
}
NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
NSLog(#"Can't Save! %# %#", error, [error localizedDescription]);
}
[self dismissViewControllerAnimated:YES completion:nil];
}
#end
ForexViewController.m
#import "ForexViewController.h"
#import "ForexDetailViewController.h"
#interface ForexViewController ()
#property (strong) NSMutableArray *devices;
#end
#implementation ForexViewController
- (NSManagedObjectContext *)managedObjectContext {
NSManagedObjectContext *context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:#selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
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;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
// Fetch the devices from persistent data store
NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:#"Calculations"];
self.devices = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy];
[self.tableView reloadData];
}
- (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.devices.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
// Configure the cell...
NSManagedObject *device = [self.devices objectAtIndex:indexPath.row];
[cell.textLabel setText:[NSString stringWithFormat:#"%#", [device valueForKey:#"name"]]];
[cell.detailTextLabel setText:[device valueForKey:#"startamount"]];
[cell.detailTextLabel setText:[device valueForKey:#"startmonth"]];
[cell.detailTextLabel setText:[device valueForKey:#"startpercent"]];
return cell;
}
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
NSManagedObjectContext *context = [self managedObjectContext];
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete object from database
[context deleteObject:[self.devices objectAtIndex:indexPath.row]];
NSError *error = nil;
if (![context save:&error]) {
NSLog(#"Can't Delete! %# %#", error, [error localizedDescription]);
return;
}
// Remove device from table view
[self.devices removeObjectAtIndex:indexPath.row];
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
}
#pragma mark - Segue
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"UpdateDevice"]) {
NSManagedObject *selectedDevice = [self.devices objectAtIndex:[[self.tableView indexPathForSelectedRow] row]];
ForexDetailViewController *destViewController = segue.destinationViewController;
destViewController.device = selectedDevice;
}
}
#end

Answer 1

Where is your code that shows how you show each view?
If you're doing this via Storyboard segue's, you should be setting the device property on the view controllers when you're preparing for segue.
Currently, I don't see how self.device is getting set for either of these view controllers so each time the view loads, it think's there isn't a device and therefore creates a new record for one.
A quick example with a storyboard segue:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"changeDeviceSettings"]) {
SomeViewController *vc = segue.destinationViewController;
vc.device = selectedDeviceGoesHere;
}
}