ios - 向下滚动然后向上滚动后 UITableViewCells 发生变化

Question

我有一个 UITableView，当我向下滚动和向上滚动时，单元格的 UILabel 中的值会发生变化。我不明白为什么会这样。

我正在使用我自己子类化的自定义 UITableViewCells。

这就是我的代码减去将所有值输入标签后的样子，因为我认为错误不存在，但在我声明 tableview 委托(delegate)方法或类似方法的方式中。

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    if (sortedItemsArray == nil) {
        return 0;
    } else
        return [sortedItemsArray count];
}

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    CustomallCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
    if (cell == nil) {
        cell = [[CustomallCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    }

    // Configure the cell...
        cell.selectionStyle = UITableViewCellSelectionStyleGray;
    if ([sortedItemsArray count] > 0) {
        currentallDictionary = [sortedItemsArray objectAtIndex:indexPath.row];
        
        NSNumber *tempDU = [currentallDictionary objectForKey:@"DU"];
        NSInteger myInteger = [tempDU integerValue];
        
        if (myInteger == 0) {

//            NSLog(@"%@", currentallDictionary);
            //assign vals to labels

            NSString *areaString = [currentallDictionary objectForKey:@"area"];
            if ((NSNull *) areaString != [NSNull null]) {
                cell.areaLabel.text = areaString;
            } else {
                cell.areaLabel.text = @" ";
            }
            

            NSString *stageString = [currentallDictionary objectForKey:@"stage"];
            if ((NSNull *) stageString != [NSNull null]) {
                cell.stageLabel.text = stageString;
            } else {
                cell.stageLabel.text = @" ";
            }
            

            NSString *floorLabelString = [currentallDictionary objectForKey:@"floorNo"];
            if ((NSNull *) floorLabelString != [NSNull null]) {
                cell.floorLabel.text = floorLabelString;
            } else  {
                cell.floorLabel.text = @" ";
            }
            

            NSString *floorDescLabelString = [currentallDictionary objectForKey:@"floorDesc"];
            if ((NSNull *) floorDescLabelString != [NSNull null]) {
                cell.floorDescLabel.text = floorDescLabelString;
            } else  {
                cell.floorDescLabel.text = @" ";
            }
            
            
            
//Buttons
            tDxStateAString = [currentallDictionary objectForKey:@"tDxStateA"];
            tDxStateBString = [currentallDictionary objectForKey:@"tDxStateB"];
            tHasDxString = [currentallDictionary objectForKey:@"tHasDx"];
            
            if ([tHasDxString isEqualToString:@"T"]) {
                tDxQtyString = [currentallDictionary objectForKey:@"tDxQty"];
                if ((NSNull *) tDxQtyString != [NSNull null]) {
                    cell.quantityALabel.text = tDxQtyString;
                    
                    
                    if (([tDxStateAString isEqualToString:@"T"]) && ([tDxStateBString isEqualToString:@"W"])) {
                        UIImage *checkedOnImage = [UIImage imageNamed:@"CheckedOn.png"];
                        [cell.DxfitButtonImage setImage:checkedOnImage forState:UIControlStateNormal];
                    } else if (([tDxStateAString isEqualToString:@"T"]) && ([tDxStateBString isEqualToString:@"R"])) {
                        UIImage *checkedOnDisabledImage = [UIImage imageNamed:@"CheckedOnDisabled.png"];
                        [cell.DxfitButtonImage setImage:checkedOnDisabledImage forState:UIControlStateNormal];
                    }else {
                        UIImage *checkedOffImage = [UIImage imageNamed:@"CheckedOff.png"];
                        [cell.DxfitButtonImage setImage:checkedOffImage forState:UIControlStateNormal];
                        cell.DxfitButtonImage.userInteractionEnabled = YES;
                    }
                    
                } else {
                    cell.quantityALabel.text = @" ";
                    cell.DxfitButtonImage.userInteractionEnabled = NO;
                }
            }

            tStateAString = [currentallDictionary objectForKey:@"tStateA"];
            tStateBString = [currentallDictionary objectForKey:@"tStateB"];
            tHasInsString = [currentallDictionary objectForKey:@"tHasIns"];
            if ([tHasInsString isEqualToString:@"T"]) {
                
                tInsQtyString = [currentallDictionary objectForKey:@"tInsQty"];
                if ((NSNull *) tInsQtyString != [NSNull null]) {
                    cell.quantityBLabel.text = tInsQtyString;
                    
                    if (([tStateAString isEqualToString:@"T"]) && ([tStateBString isEqualToString:@"W"])) {
                        UIImage *checkedOnImage = [UIImage imageNamed:@"CheckedOn.png"];
                        [cell.allButtonImage setImage:checkedOnImage forState:UIControlStateNormal];
                    } else if (([tStateAString isEqualToString:@"T"]) && ([tStateBString isEqualToString:@"R"])) {
                        UIImage *checkedOnDisabledImage = [UIImage imageNamed:@"CheckedOnDisabled.png"];
                        [cell.allButtonImage setImage:checkedOnDisabledImage forState:UIControlStateNormal];
                    } else {
                        UIImage *checkedOffImage = [UIImage imageNamed:@"CheckedOff.png"];
                        [cell.allButtonImage setImage:checkedOffImage forState:UIControlStateNormal];
                    }
                } else {
                    cell.quantityBLabel.text = @" ";
                    cell.allButtonImage.userInteractionEnabled = NO;
                }
            }
            
            
            
        }
    }
    return cell;
}

如何停止单元格的重复？

Answer 1

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    CustomInstallCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[CustomInstallCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
UILabel *lbl_name = [[UILabel alloc]initWithFrame:CGRectMake(10, 7, 280, 25)];
            lbl_name.tag = 1000;
            [lbl_name setFont:[UIFont fontWithName:@"Helvetica" size:16.0f]];
            lbl_name.lineBreakMode = UILineBreakModeWordWrap;
            lbl_name.numberOfLines = 0;
            [lbl_name setBackgroundColor:[UIColor clearColor]];
            [lbl_name sizeToFit];
            [cell.contentView addSubview:lbl_name];
     //Create all your Labels here and set the tag
    }
    //Access your lbl by the tag here
    UILabel *lbl_name = (UILabel *)[cell.contentView viewWithTag:1000];
    [lbl_name setText:[yourArray objectAtIndex:indexPath.row]];

        cell.selectionStyle = UITableViewCellSelectionStyleGray;

    return cell;
}

像这样尝试.. 然后不需要检查数组在 cellForRowAtIndexPath 中是否有元素:如果它有元素那么只有循环来这里。希望对你有所帮助