UITableView 自定义单元格更改值 iOS 9

Posted 2023-03-04

【中文标题】UITableView 自定义单元格更改值 iOS 9

【英文标题】：UITableView Custom cell changing values iOS 9

【发布时间】：2016-01-10 08:34:21

【问题描述】：

我在自定义单元格中遇到问题，同时上下滚动单元格中的值会发生变化。我在最后一节中添加了 2 个按钮。请检查以下代码。任何帮助，非常感谢。非常感谢。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    static NSString *cellIdentifier = @"cell";

    DrinkCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (!cell) 

        cell = [[DrinkCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    

    if (indexPath.section == [tableView numberOfSections] - 1)
    
        cell.tileImage.hidden = YES;
        cell.pizzaTopins.hidden = YES;
        // cell.accessoryType = UITableViewCellAccessoryNone;
        if (indexPath.row == 0) 

            cell.separatorInset = UIEdgeInsetsMake(0.f, 0.f, 0.f, cell.bounds.size.width);
            UILabel *calorieLabel = [[UILabel alloc]initWithFrame:CGRectMake(5, cell.contentView.frame.size.height/2-30/2, self.tableView.frame.size.width, 30)];
            calorieLabel.text = @"1000 Calories | 700 grams of fat";
            cell.backgroundColor = backgroundColorApp;

            [cell addSubview:calorieLabel];
        
        else if (indexPath.row == 1) 

            cell.backgroundColor = backgroundColorApp;
            NSLog(@"cell width : %f",cell.contentView.frame.size.width);

            UIView *quantityView = [[UIView alloc]init];
            quantityView.frame = CGRectMake(25 ,cell.contentView.frame.size.height/2-50/2, cell.contentView.frame.size.width-55, 50);
            quantityView.backgroundColor    = [UIColor whiteColor];
            quantityView.clipsToBounds      = YES;
            quantityView.userInteractionEnabled = YES;
            quantityView.layer.cornerRadius = 10.0f;

            UIButton *decreaseButton  = [[UIButton alloc]initWithFrame:CGRectMake(10, quantityView.frame.size.height/2-35/2, 35, 35)];
            [decreaseButton setTitle:@"-" forState:UIControlStateNormal];
            [quantityView addSubview:decreaseButton];
            [decreaseButton addTarget:self action:@selector(decreaseQuantity:) forControlEvents:UIControlEventTouchUpInside];
            [decreaseButton setTitleColor:quantityButtonColor forState:UIControlStateNormal];

            [decreaseButton setTintColor:[UIColor greenColor]];
            decreaseButton.clipsToBounds = YES;
            decreaseButton.layer.cornerRadius = 17.5f;
            decreaseButton.layer.borderColor = quantityButtonColor.CGColor;
            decreaseButton.layer.borderWidth = 1.5f;
            int i =0;
            quantityLabel = [[UILabel alloc]initWithFrame:CGRectMake(quantityView.frame.size.width/2-30/2, quantityView.frame.size.height/2-30/2, 30, 30)];
            quantityLabel.text = [NSString stringWithFormat:@"%d",i];
            [quantityLabel setFont:[UIFont boldSystemFontOfSize:18]];
            quantityLabel.textColor = quantityButtonColor;
            [quantityView addSubview:quantityLabel];


            UIButton *increaseButton  = [[UIButton alloc]initWithFrame:CGRectMake(quantityView.frame.size.width-45, quantityView.frame.size.height/2-35/2, 35, 35)];

            [increaseButton setTitle:@"+" forState:UIControlStateNormal];
            [increaseButton addTarget:self action:@selector(increaseQuantity:) forControlEvents:UIControlEventTouchUpInside];
            [quantityView addSubview:increaseButton];
            increaseButton.clipsToBounds = YES;
            [increaseButton setTitleColor:quantityButtonColor forState:UIControlStateNormal];

            increaseButton.layer.cornerRadius = 17.5f;
            increaseButton.layer.borderColor = quantityButtonColor.CGColor;
            increaseButton.layer.borderWidth = 1.5f;

            [cell addSubview:quantityView];
            [quantityView addSubview:decreaseButton];
            [quantityView addSubview:increaseButton];
        
        else  if (indexPath.row == 2) 
            addTocartButton  = [[UIButton alloc]initWithFrame:CGRectMake(25, cell.contentView.frame.size.height/2 - 50/2, cell.contentView.frame.size.width-55, 50)];

            [addTocartButton setTitle:@"Add to Cart" forState:UIControlStateNormal];
            [addTocartButton addTarget:self action:@selector(addToCartOnCreatePizza:) forControlEvents:UIControlEventTouchUpInside];
            addTocartButton.backgroundColor = [UIColor colorWithRed:190.0f/255.0f green:19.0f/255.0f blue:31.0f/255.0f alpha:1.0];
            //   [cell.contentView addSubview:addTocartButton];
            [cell.contentView insertSubview:addTocartButton atIndex:0];
            addTocartButton.clipsToBounds = YES;
            addTocartButton.layer.cornerRadius =10.0f;

        
    

    cell.pizzaTopins.textColor = [UIColor colorWithRed:190.0f/255.0f green:19.0f/255.0f blue:31.0f/255.0f alpha:1.0];
    cell.pizzaTopins.text = [dataArray objectAtIndex:indexPath.row];
    cell.tileImage.image = [UIImage imageNamed:@"profile44.png"];

    //  cell.separatorStyle = UITableViewCellSeparatorStyleSingleLine;

    return cell;

【问题讨论】：

您面临的具体问题是什么？没有得到你的问题。

滚动时，tableview 看起来很乱。按钮和标签已折叠。

如果我删除我在上一节中添加的按钮是没有问题的。但是如果我添加按钮，在向下和向上滚动时，按钮会出现在第一行。

可以在滚动之前/之后添加 2 个屏幕截图吗？

【参考方案1】：

dequeueReusableCellWithIdentifier 将“重用”以前创建的单元格，因此您必须确保重新初始化所有手动添加/修改的属性，包括您以编程方式添加的任何按钮。

屏幕截图可以帮助我们正确诊断问题，但您的代码容易受到重复使用单元格的挥之不去的属性的影响，所以我建议从这个开始。

顺便说一句，如果您在 IB 中定义了多个单元原型并根据 indexPath 行改变单元标识符，那么您最终可能会得到更简单的代码。

【讨论】：

感谢您的回答。我已经通过在故事板中创建另一个客户单元来修复。