passing data from detail view to a table view ios 4 - iphone

Question

I have two views, the first (view A) is a table view. Every row has a disclosure button, when I click on the button I display the second view (view B) which is a table view too. When i click on a row, I want to pass the data to view A and display it as detailTextLabel.
#import <UIKit/UIKit.h>
#interface A : UIViewController <UITableViewDelegate, UITableViewDataSource> {
NSDictionary *listData;
NSArray *keys;
}
#property (nonatomic, retain) NSDictionary *listData;
#property (nonatomic, retain) NSArray *keys;
#end
#import "A.h"
#implementation A
#synthesize listData;
#synthesize keys;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)dealloc
{
[listData release];
[keys release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
NSString *path = [[NSBundle mainBundle] pathForResource:#"Criteres" ofType:#"plist"];
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
self.listData = dict;
[dict release];
NSArray *array = [[listData allKeys]sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)];
self.keys = array;
[super viewDidLoad];
}
- (void)viewDidUnload
{
self.listData = nil;
self.keys = nil;
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark -
#pragma mark Table View Data Source Methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [keys count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSString *key = [keys objectAtIndex:section];
NSArray *nameSection = [listData objectForKey:key];
return [nameSection count];
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
NSString *key = [keys objectAtIndex:section];
return key;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSString *key = [keys objectAtIndex:section];
NSArray *nameSection = [listData objectForKey:key];
static NSString *SectionsTableIdentifier = #"SectionsTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SectionsTableIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:SectionsTableIdentifier] autorelease];
}
cell.textLabel.text = [nameSection objectAtIndex:row];
if (section == 0) {
cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
if (row == 2)
cell.detailTextLabel.text = #"En m2";
if (row == 1)
cell.detailTextLabel.text = #"En €";
}
if (section == 1) {
cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
}
}
return cell;
}
#pragma mark -
#pragma mark Table Delegate Methods
- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath {
NSUInteger row = 2;
return row;
}
-(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
return indexPath;
}
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *ownerCell = [tableView cellForRowAtIndexPath:indexPath];
if ([ownerCell.textLabel.text isEqualToString:#"Ecole"]) {
B *prixview = [[B alloc]init];
[self.navigationController pushViewController:prixview animated:YES];
prixview.title = #"prix";
}
if ([ownerCell.textLabel.text isEqualToString:#"Crèche"]) {
B *prixview = [[B alloc]init];
[self.navigationController pushViewController:prixview animated:YES];
prixview.title = #"Prix";
}
}
#end
#import <UIKit/UIKit.h>
#interface B : UIViewController <UITableViewDelegate, UITableViewDataSource> {
NSArray *typetab;
NSInteger radioSelectionTypeBien;
NSString *radioSelectionTypeBienString;
}
#property (nonatomic, retain) NSArray *typetab;
#property (nonatomic, retain) NSString *radioSelectionTypeBienString;
#end
#import "B.h"
#implementation B
#synthesize typetab;
#synthesize radioSelectionTypeBienString;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)dealloc
{
[self.radioSelectionTypeBienString release];
[self.typetab release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
initWithTitle:#"Critères"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(backButtonActionTypeBien:)];
self.navigationItem.leftBarButtonItem = backButton;
[backButton release];
radioSelectionTypeBien = -1;
NSArray *type = [[NSArray alloc]initWithObjects:#"Appartement",#"Maison",#"Commerce", nil ];
self.typetab = type;
[type release];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
-(IBAction)backButtonActionTypeBien: (id)sender
{
[self.navigationController pushViewController:self.navigationController.parentViewController animated:YES];
}
- (void)viewDidUnload
{
self.radioSelectionTypeBienString = nil;
self.typetab = nil;
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark -
#pragma mark Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.typetab count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *SimpleTableIdentifier = #"SimpleTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIdentifier];
if (cell == nil) { cell = [[[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SimpleTableIdentifier] autorelease];
}
cell.accessoryType = UITableViewCellAccessoryNone;
cell.textLabel.text = [typetab objectAtIndex:indexPath.row];
if (indexPath.row == radioSelectionTypeBien){
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
return cell;
}
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
radioSelectionTypeBien = indexPath.row;
radioSelectionTypeBienString = [tableView cellForRowAtIndexPath:indexPath].textLabel.text;
[tableView reloadData];
}
#end

Answer 1

Usually i write a method in the controller B like:
-(voi)initVCwithString:(NSString*)_string andSomeObject:(NSObject *)_obj;
(so the controller B must have 2 ivar, a string and an object, that you have to set in this method)
then call this in your didSelectRowAtIndexPath: from the controller A
...
B _vcB=//alloc..init..etc
[_vcB initVCwithString:yourCell.textLabel.text andSomeObject:someObj];
[self.navigationController pushViewController:_vcB animated:YES];
[_vcB release];
Then in cellForRowAtIndexPath of B set cell.detailTextLabel.text=yourStringIvar;
Hope this helps.

Answer 2

Basically there are two possibilities that seems to be suitable. You can write a custom delegate method which pass the value to the A controller, or you can make a notification via notification centre, which can then assign the value to the A controller by catching the notification which will be triggered by picking a cell in the controller B.