How to show Updated values of UITableViewCell from another method ? - ios

Question

I declared globally
NSIndexPath *selectedIndexPath;
and here is my didselectmethod
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath
{
UIAlertView *loAlert = [[UIAlertView alloc]initWithTitle:#"Are you sure you want to redeem?" message:nil delegate:self cancelButtonTitle:#"Yes" otherButtonTitles:#"No", nil];
loAlert.tag = 10;
[loAlert show];
selectedIndexPath = indexPath;
}
After selecting row i am showing alert
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex: (NSInteger)buttonIndex
{
if(alertView.tag == 10)
{
if(buttonIndex == 0)
{
[self redeemOfferService];
}
}
}
Then calling redeemOfferService, in this method i am facing problem
- (void)redeemOfferService
{
OffersBoughtCellTableViewCell * selectedCell1 = [offersTableView cellForRowAtIndexPath:selectedIndexPath];
NSLog(#"%# ************", selectedCell1.quantity.text);
// for e.g. selected cell's quantity is 0 (here i can see selected cell quantity)
i want to change and update here as follow
selectedCell1.quantity.text = #"Quantity : 5";
// after this i can see quantity in my cell is 5 but
when i scroll values are again showing from
cellForRowAtIndexPath i want to show updated value on cell,
how to do this ?
}
For more details here is my cellForRowAtIndexPath
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
OffersBoughtCellTableViewCell *cell = (OffersBoughtCellTableViewCell *)
[tableView dequeueReusableCellWithIdentifier:#"offersCell" forIndexPath:indexPath];
OfferDetail * offerDetailObj=[[OfferDetail alloc]init];
// OfferDetail, OffersBoughtDetails are NSObject class
// #property (nonatomic, strong) OfferDetail *offerObj;& OffersBoughtDetails * selectedOfferBoughtObj;
// and #property (nonatomic, strong) NSArray *offersBought;
offerDetailObj=[self.listOfOffers objectAtIndex:indexPath.row];
OffersBoughtDetails * offerBoughtObj=[self.offerObj.offersBought objectAtIndex:indexPath.row];
selectedOfferBoughtObj=offerBoughtObj;
cell.quantity.text=[NSString stringWithFormat:#"Quantity : %#",offerBoughtObj.quantity];
}

Answer 1

The problem is that when you scroll to your changed cell again, - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath get invoked, but your data would not change,cell.quantity.text=[NSString stringWithFormat:#"Quantity : %#",offerBoughtObj.quantity];, so your cell's quantity still shows what your data model offerBoughtObj is.
Since iOS uses MVC, a solution is you change your data model, and then reflect your model changes to your view.
- (void)redeemOfferService {
OffersBoughtDetails * offerBoughtObj=[self.offerObj.offersBought objectAtIndex:selectedIndexPath];
// change offerBoughtObj to the value you want
offerBoughtObj.quantity = whateveryoulike;
// reload your tableview
[tablview reloadRowsAtIndexPaths:#[selectedIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

Answer 2

As far As I understand your problem after selecting a Cell You want to remove that cell from UITableView.
To do this put all your UITable data in NSMutableArray
And In your - (void)redeemOfferService method after doing all task
just remove that selected object like:
[dataArray removeObject:#"selectedObject"];
And reload the table Data
[tableView reloadData];

Answer 3

You have to update the source of the table, the offerDetailObj in your case, so in - (void)redeemOfferService methods, fetch the data from the array and get the selected object, update it's value and save it again to your array. I think this should work:
- (void)redeemOfferService
{
OffersBoughtCellTableViewCell * selectedCell1 = [offersTableView cellForRowAtIndexPath:selectedIndexPath];
NSLog(#"%# ************", selectedCell1.quantity.text);
// for e.g. selected cell's quantity is 0 (here i can see selected cell quantity)
//i want to change and update here as follow
selectedCell1.quantity.text = #"Quantity : 5";
//Update your source array to the correct value
offerDetailObj=[self.listOfOffers objectAtIndex:indexPath.row];
OffersBoughtDetails * offerBoughtObj=[self.offerDetailObj.offersBought objectAtIndex:indexPath.row];
OffersBoughtDetails.quantity = 5;
[offerDetailObj replaceObjectAtIndex:indexPath.row withObject:offerBoughtObj];
self.listOfOffers replaceObjectAtIndex:indexPath.row withObject:offerDetailObj];
}
Your Array should be mutable so you can add/remove/replace object from it, means that your listOfOffers and offersBought should be NSMutableArray.

Answer 4

I think in your alertViewDelegate method you should set selectetdIndexPath to nil if the user selects NO
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex: (NSInteger)buttonIndex
{
if(alertView.tag == 10)
{
if(buttonIndex == 0)
{
[self redeemOfferService];
}
else
selectedIndexPath = nil;
}
}
and in your redeemOffService you should reload cell
- (void)redeemOfferService
{
OffersBoughtCellTableViewCell * selectedCell1 = [offersTableView cellForRowAtIndexPath:selectedIndexPath];
NSLog(#"%# ************", selectedCell1.quantity.text);
// for e.g. selected cell's quantity is 0 (here i can see selected cell quantity)
i want to change and update here as follow
selectedCell1.quantity.text = #"Quantity : 5";
[self.tableView reloadRowsAtIndexPaths:#[selectedIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
selectedIndexPath = nil;
}
Hope this helps :D