UITextFields text in custom UITableViewCell appears in other cell while Scrolling - ios

Question

I am new to iOS development. i create my app in Xcode 6(Storyboard).
My problem is text enter into textfield, scroll the table view that shuffle the textfield text to other text field randomly. There are two question i saw in stack-overflow like this. but that answer are not solve question.
MoneyEntry.xib is a uitableviewcell with one label and one text box. And add class file to it and connect IBOutlet and add identifier to the uitableviewcell as "MoneyEntryIdentifier".
//MoneyEntryTableViewCell.h
#interface MoneyEntryTableViewCell : UITableViewCell
//Money Entry Cell
#property (strong, nonatomic) IBOutlet UILabel *lblMemName;
#property (strong, nonatomic) IBOutlet UITextField *textAmount;
#end
//MoneyEntryTableViewCell.m
#import "MoneyEntryTableViewCell.h"
#implementation MoneyEntryTableViewCell
#synthesize lblMemName,textAmount;
- (void)awakeFromNib {
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
}
#end
In Main.storyboard add UITableView and connect IBOutlet and add Datasource and delegate.
//MoneyDetailViewController.h
#import <UIKit/UIKit.h>
#interface MoneyDetailViewController : UIViewController
#property (strong, nonatomic) IBOutlet UITableView *tblVwMoneyEntry;
#end
//MoneyDetailViewController.m
#interface MoneyDetailViewController ()
{
NSArray *tabledata;
}
#end
#implementation MoneyDetailViewController
- (void)viewDidLoad {
[super viewDidLoad];
tabledata = [NSArray arrayWithObjects:#"Egg Benedict", #"Mushroom Risotto",#"Full Breakfast", #"Hamburger", #"Ham and Egg Sandwich", #"Creme Brelee",#"White Chocolate Donut", #"Starbucks Coffee", #"Vegetable Curry", nil];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [tabledata count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"MoneyEntryIdentifier";
static NSString *CellNib = #"MoneyEntry";
MoneyEntryTableViewCell *cell = (MoneyEntryTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:CellNib owner:self options:nil];
cell = (MoneyEntryTableViewCell *)[nib objectAtIndex:0];
}
UILabel *lblname = (UILabel *) [cell lblMemName];
UITextField *txtfield = (UITextField *)[cell textAmount];
txtfield.tag = indexPath.row;
lblname.text = [tabledata objectAtIndex:indexPath.row];
txtfield.placeholder =#"0.00";
cell.selectionStyle =UITableViewCellSelectionStyleNone;
return cell;
}
#end
Please explain me detail. Thanks in advance

Answer 1

I found answer.... Just get the textfield text into Dictionary setObject by label text and again check by label Text assign the text to corresponding Textfield.. here is my code...
//In Interface
NSMutableDictionary *amounts;
amounts =[[NSMutableDictionary alloc]init];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"MoneyEntryIdentifier";
static NSString *CellNib = #"MoneyEntry";
MoneyEntryTableViewCell *cell = (MoneyEntryTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:CellNib owner:self options:nil];
cell = (MoneyEntryTableViewCell *)[nib objectAtIndex:0];
}
UILabel *lblname = (UILabel *) [cell lblMemName];
lblname.tag =100;
UITextField *txtfield = (UITextField *)[cell textAmount];
txtfield.tag =indexPath.row;
[txtfield addTarget:self action:#selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
lblname.text = tabledata[indexPath.row];
txtfield.placeholder = [NSString stringWithFormat:#"%ld",(long)indexPath.row];
if ([amounts valueForKey:lblname.text] != nil) {
txtfield.text = [amounts valueForKey:lblname.text];
} else {
txtfield.text = #"";
}
cell.selectionStyle =UITableViewCellSelectionStyleNone;
return cell;
}
-(void)textFieldDidChange:(UITextField *)txtField
{
UILabel *label = (UILabel *)[txtField.superview viewWithTag:100];
NSString *labelString = label.text;
NSString *textFieldString = txtField.text;
[amounts setObject:textFieldString forKey:labelString];
}
There is no error while scroll table view...

Answer 2

Are you doing something to store the text entered into the textfield. The UITableView works by reusing UITableViewCells that are not visible or gone out of the screen to save memory.
So if you enter some text into a textfield in the cell and the cell goes out of the screen, the cell gets queued up for later use. As you scroll new rows are added from this queue, which bring the textfield with your previous text back. This is why you see your text randomly popping everywhere.
You need to save the data from each textfield in a separate array and reset it in cellForRowAtIndexPath: function.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// Your code..
Item *item = itemArray[indexPath.row]
cell.txtfield.text = item.amount
}
You can use the UITextField's UIControlEventEditingChanged event to store the changed array values.
-(void)textFieldDidChange:(UITextField *)txtField
{
Item *item = itemArray[txtField.tag]
item.amount = txtField.text
}
You add the textField change method like this
[textField addTarget:self
action:#selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
Use a custom class called Item to store your data.
class Item
{
#property (nonatomic,strong) NSString *itemName;
#property (nonatomic) float amount;
}
itemArray will contain your items.
Item *it1 = [[Item alloc]init]
it1.itemName = #"Eggs Benedict"
it1.amount = ""
....
itemArray = [NSArray arrayWithObjects:it1,it2,it3,nil];