How to pass data back from detail view controller to uitableview? - iphone

Question

In my app i making use of uitable to select category from my list.
my task is,when ever user click or select a cell he should be able to view the selected cell detail in next view(detail view). and when he select the item in a detail view he should be able to move back in a table view and should be able to see the selected item in a rootivew controller.
i am able to navigate properly from tableview to detail view,but i am not able to show the item which is selected in detail view to rootviewcontroller.
please help me out with this issue.
image one is my rootview controller page.
for example : if user select #"make" he will able to see all the releated category of #"make"
. in a next page(which image2).
image to is my detail page.
and when user select #"abarth" it should be display in a rootview controller page(which is page one).
following is my code of rootview controller page:
- (void)viewDidLoad
{
self.car = [[NSArray alloc]initWithObjects:#"Make",#"Model",#"Price Min",#"Price Max",#"State",nil];
[super viewDidLoad];
}
-(NSInteger) numberOfSectionInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.car count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *TextCellIdentifier = #"Cell";
UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:TextCellIdentifier];
if (cell==nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:TextCellIdentifier];
cell.accessoryType = UITableViewCellAccessoryNone;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
cell.textLabel.text = [self.car objectAtIndex:[indexPath row]];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (0 == indexPath.row)
{
NSLog(#"0");
self.detailcontroller.title = #"Make";
}
else if (1 == indexPath.row)
{
NSLog(#"1");
self.detailcontroller.title = #"Model";
}
else if (2 == indexPath.row)
{
NSLog(#"2");
self.detailcontroller.title = #"Price Min";
}
else if (3 == indexPath.row)
{
self.detailcontroller.title = #"Price Max";
}
else if (4 == indexPath.row)
{
NSLog(#"3");
self.detailcontroller.title = #"State";
}
[self.navigationController
pushViewController:self.detailcontroller
animated:YES];
}
following is my detail view page code:
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
if ([self.title isEqualToString:#"Make"])
{
detail = [[NSArray alloc]initWithObjects:#"Any Make",#"Abarth",#"AC",#"ADAYER",#"Adelaide",#"ALFA ROMEO",#"ALLARD",#"ALPINE-RENAULT",#"ALVIS",#"ARMSTRONG",
#"ASTON MARTIN",#"AUDI",#"AUSTIN",#"AUSTIN HEALEY",#"Barossa",#"BEDFORD",
#"BENTLEY",#"BERTONE",#"BMW",#"BOLWELL",#"BRISTOL",#"BUICK",#"BULLET",
#"CADILLAC",#"CATERHAM",#"CHERY",#"CHEVROLET",#"CHRYSLER",#"CITROEN",
#"Country Central",#"CSV",#"CUSTOM",#"DAEWOO",#"DAIHATSU",#"DAIMLER",
#"DATSUN",#"DE TOMASO",#"DELOREAN",#"DODGE",#"ELFIN",#"ESSEX",
#"EUNOS",#"EXCALIBUR",#"FERRARI",nil];
if ([self.title isEqualToString:#"Abarth"])
{
detail = [[NSArray alloc]initWithObjects:#"HI", nil];
}
}
else if ([self.title isEqualToString:#"Model"])
{
detail = [[NSArray alloc]initWithObjects:#"Any Model", nil];
}
else if ([self.title isEqualToString:#"Price Min"])
{
detail = [[NSArray alloc]initWithObjects:#"Min",#"$2,500",
#"$5,000",
#"$7,500",
#"$10,000",
#"$15,000",
#"$20,000",
#"$25,000",
#"$30,000",
#"$35,000",
#"$40,000",
#"$45,000",
#"$50,000",
#"$60,000",
#"$70,000",
#"$80,000",
#"$90,000",
#"$100,000",
#"$500,000",
#"$1,000,000",nil];
}
else if ([self.title isEqualToString:#"Price Max"])
{
detail = [[NSArray alloc]initWithObjects:#"Max",
#"$2,500",
#"$5,000",
#"$7,500",
#"$10,000",
#"$15,000",
#"$20,000",
#"$25,000",
#"$30,000",
#"$35,000",
#"$40,000",
#"$45,000",
#"$50,000",
#"$60,000",
#"$70,000",
#"$80,000",
#"$90,000",
#"$100,000",
#"$500,000",
#"$1,000,000",nil];
}
else if ([self.title isEqualToString:#"State"])
{
detail = [[NSArray alloc]initWithObjects:#"Any State",
#"Australian Capital Territory",
#"New South Wales",
#"Northern Territory",
#"Queensland",
#"South Australia",
#"Tasmania",
#"Victoria",
#"Western Australia",nil];
}
[self.tableView reloadData];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [detail count];
}
- (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];
}
cell.textLabel.text = [detail objectAtIndex:
[indexPath row]];
cell.font = [UIFont systemFontOfSize:14.0];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.navigationController popViewControllerAnimated:YES];
}

Answer 1

You need to make use of custom delegates. Create a protocol in your detailview and implement it in your rootview.Pass the selected string as parameter to delegate method and from the delegate method, display it in your textfield.
//something like this
#interface detailViewController
// protocol declaration
#protocol myDelegate
#optional
-(void)selectedValueIs:(NSString *)value;
// set it as the property
#property (nonatomic, assign) id<myDelegate> selectedValueDelegate;
// in your implementation class synthesize it and call the delegate method
#implementation detailViewController
#synthesize selectedValueDelegate
// in your didselectRowAtIndex method call this delegate method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self selectedValueDelegate])selectedValueIs:valueString] ;
[self.navigationController popViewControllerAnimated:YES];
}
#end
// In your rootViewController conform to this protocol and then set the delegate
detailViewCtrlObj.selectedValueDelegate=self;
//Implement the delegate Method
-(void)selectedValueIs:(NSString *)value{
{
// do whatever you want with the value string
}

Answer 2

Hi you will have to do it using protocols and delegate
Please see my linkon protocol and delegate
you can also do it by creating a variable in appdelegate , setting its property and accessing it in any other view .
YourAppDelegate *appDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
delegate.yourVariable;