UITableView再読み込み

Question

テーブルの再読み込みに問題があります。私cellForRowAtIndexPathは次のとおりです。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

    int counter=indexPath.row; 

    NSString *CellIdentifier = [NSString stringWithFormat:@"%d",counter]; 

    // Dequeue or create a cell of the appropriate type. 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 

    if (cell == nil) 
    { 
     cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; 

     cell.selectionStyle=UITableViewCellSelectionStyleNone; 


    //ID 
    UILabel *lblID=[[UILabel alloc]init]; 
    lblID.frame=CGRectMake(10, 15.0, 150, 30.0); 
    [lblID setFont:[UIFont boldSystemFontOfSize:20.0]]; 
    [lblID setBackgroundColor:[UIColor clearColor]]; 
    [lblID setTextColor:[UIColor blackColor]]; 
    lblID.text = [arrID objectAtIndex:indexPath.row]; 
    [cell.contentView addSubview:lblID]; 
    [lblID release]; 

    //Date 
    UILabel *lblName=[[UILabel alloc]init]; 
    lblName.frame=CGRectMake(130, 15.0, 250, 30.0); 
    [lblName setFont:[UIFont systemFontOfSize:20.0]]; 
    [lblName setBackgroundColor:[UIColor clearColor]]; 
    [lblName setTextColor:[UIColor blackColor]]; 
    lblName.text = [arrProductName objectAtIndex:indexPath.row]; 
    [cell.contentView addSubview:lblName]; 
    [lblName release]; 

    //Qty 
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(320, 20, 50, 30)]; 
    [textField addTarget:self action:@selector(TextOfTextField:) 
     forControlEvents:UIControlEventEditingDidEnd]; 
    textField.userInteractionEnabled = true; 
    textField.borderStyle = UITextBorderStyleRoundedRect; 
    textField.font = [UIFont systemFontOfSize:15]; 
    textField.text = [arrItems objectAtIndex:indexPath.row]; 
    textField.tag = indexPath.row; 
    textField.autocorrectionType = UITextAutocorrectionTypeNo; 
    textField.keyboardType = UIKeyboardTypePhonePad; 
    textField.returnKeyType = UIReturnKeyDone; 
    textField.clearButtonMode = UITextFieldViewModeWhileEditing; 
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;  
    textField.delegate = self; 
    [arrTxtItems addObject:textField]; 
    [cell.contentView addSubview:textField]; 
    [textField release]; 

    //Discount 
    UITextField *txtDiscount = [[UITextField alloc] initWithFrame:CGRectMake(460, 20, 50, 30)]; 
    // [txtDiscount addTarget:self action:@selector(TextOfTextField:) 
    // forControlEvents:UIControlEventEditingDidEnd]; 
    txtDiscount.userInteractionEnabled = true; 
    txtDiscount.borderStyle = UITextBorderStyleRoundedRect; 
    txtDiscount.font = [UIFont systemFontOfSize:15]; 
    txtDiscount.text = [arrDiscount objectAtIndex:indexPath.row]; 
    txtDiscount.tag = indexPath.row; 
    txtDiscount.autocorrectionType = UITextAutocorrectionTypeNo; 
    txtDiscount.keyboardType = UIKeyboardTypePhonePad; 
    txtDiscount.returnKeyType = UIReturnKeyDone; 
    txtDiscount.clearButtonMode = UITextFieldViewModeWhileEditing; 
    txtDiscount.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;  
    txtDiscount.delegate = self; 
    [arrTxtDiscount addObject:txtDiscount]; 
    [cell.contentView addSubview:txtDiscount]; 
    [txtDiscount release]; 

    //Price 
    UILabel *lblPrice=[[UILabel alloc]init]; 
    lblPrice.frame=CGRectMake(560, 15.0, 250, 30.0); 
    [lblPrice setFont:[UIFont boldSystemFontOfSize:20.0]]; 
    [lblPrice setBackgroundColor:[UIColor clearColor]]; 
    [lblPrice setTextColor:[UIColor blackColor]]; 
    [arrLblNetPrice addObject:lblPrice]; 
    NSString *strPrice = [arrPrice objectAtIndex:indexPath.row]; 

    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; 
    [formatter setGroupingSeparator:@"."]; 
    [formatter setGroupingSize:2]; 
    [formatter setUsesGroupingSeparator:YES]; 
    [formatter setSecondaryGroupingSize:3]; 
    NSString *str = [formatter stringFromNumber:[NSNumber numberWithDouble:[strPrice doubleValue]]]; 
    [formatter release]; 
    NSLog(@"str : %@",str); 
    NSLog(@"strPrice : %@",strPrice); 
    lblPrice.text = str; 
    [cell.contentView addSubview:lblPrice]; 
    [lblPrice release]; 
    } 
     return cell; 
} 

構造化セルこの方法は、私はテーブルをスクロールするとき、私はTextFieldの値を保持するのに役立ちます。しかし、ある時点でテーブルを再ロードすると、のセルがまだリリースされていないため、には入りません。この状態でどこで細胞を放出すべきですか？

Answer 1

セルインスタンスの作成/取得と、データでセルプロパティを構成することを区別する必要があります。次のようにコードを変更してください：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

    int counter=indexPath.row; 

    NSString *CellIdentifier = [NSString stringWithFormat:@"%d",counter]; 

    // Dequeue or create a cell of the appropriate type. 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 

    if (cell == nil) 
    { 
     cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; 

     cell.selectionStyle=UITableViewCellSelectionStyleNone; 

     //ID 
     UILabel *lblID=[[UILabel alloc]init]; 
     lblID.frame=CGRectMake(10, 15.0, 150, 30.0); 
     [lblID setFont:[UIFont boldSystemFontOfSize:20.0]]; 
     [lblID setBackgroundColor:[UIColor clearColor]]; 
     [lblID setTextColor:[UIColor blackColor]]; 
     lblID.tag = MyViewTagIDLabel;  // make an enum to give your subviews unique tags > 0 
     [cell.contentView addSubview:lblID]; 
     [lblID release]; 

     // add the rest of your subviews 

     // any other cell configuration that does not change based on the ind 
    } 

    // configure the cell with data based on the indexPath 
    UILabel lblID = [cell.contentView viewWithTag:MyViewTagIDLabel]; 
    lblID.text = [arrID objectAtIndex:indexPath.row]; 

    // configure the rest of the subviews 

    return cell; 
}