ios - 具有不同对象的动态 UITableview

Question

我有一个带有 UITextField、UIDatePicker、UIPickerView 自定义单元格的表格 View 。 在我的方法 cellForRowAtIndexPath 中，我为每一行设置了它的行为。 但是我意识到，当我点击顶部的第一行时，一切都很好，而不是当我向下滚动表格并更改底部的值时，例如，我在第 7 行输入的值插入到第 8 行，依此类推下线 实际上，当我滚动表格时，它会混淆行的索引 或者例如 il UITableViewCellAccessoryDisclosureIndicator 而不是在重新加载表时将其分配给第 9 行，表将其分配给第 2 行

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    UITextField *text1 = (UITextField *)[cell viewWithTag:100];
    UILabel *text2 = (UILabel *)[cell viewWithTag:200];
    text1.text = [valuesArray objectAtIndex:indexPath.row];
    text2.text = [titlesArray objectAtIndex:indexPath.row];

    switch (indexPath.row) {
        case 0:  
            {
                text1.delegate = self;
                text1.tag = indexPath.row;
            }
            break;

        case 1: 
            {
                activityPicker = [[UIPickerView alloc] init];
                activityPicker.delegate = self;
                activityPicker.tag = indexPath.row;
                text1.delegate = self;
                text1.inputView  = activityPicker;
            }
            break;

        case 2: 
            {
                datePicker = [[UIDatePicker alloc] init];
                datePicker.datePickerMode = UIDatePickerModeDate;
                [datePicker addTarget:self action:@selector(onDatePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
                text1.delegate = self;
                text1.inputView = datePicker;
                datePicker.tag = indexPath.row;
            }
            break;

        case 3: 
            {
                datePicker = [[UIDatePicker alloc] init];
                datePicker.datePickerMode = UIDatePickerModeTime;
                [datePicker addTarget:self action:@selector(onDatePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
                text1.delegate = self;
                text1.inputView = datePicker;
                datePicker.tag = indexPath.row;
                NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
                [dateFormatter setDateFormat:@"HH:mm"];
                [datePicker setDate: [dateFormatter dateFromString:text1.text]];
            }
            break;

        case 4:  
            {
                activityPicker = [[UIPickerView alloc] init];
                activityPicker.delegate = self;
                activityPicker.tag = indexPath.row;
                NSString *km = [text1.text substringToIndex:[text1.text length]-3];
                int numkm = [km intValue] - 1;
                [activityPicker selectRow:numkm inComponent:0 animated:YES];
                text1.delegate = self;
                text1.inputView  = activityPicker;
            }
            break;

        case 5: 
            {
                activityPicker = [[UIPickerView alloc] init];
                activityPicker.delegate = self;
                activityPicker.tag = indexPath.row;
                text1.delegate = self;
                text1.inputView = activityPicker;
            }
            break;

        case 6: 
            {
                activityPicker = [[UIPickerView alloc] init];
                activityPicker.delegate = self;
                activityPicker.tag = indexPath.row;
                if ([text1.text isEqualToString:[animalsArray objectAtIndex:0]])
                    [activityPicker selectRow:0 inComponent:0 animated:YES];
                else
                    [activityPicker selectRow:1 inComponent:0 animated:YES];

                text1.delegate = self;
                text1.inputView = activityPicker;
            }
            break;

        case 7:  
                text1.delegate = self;
                text1.tag = indexPath.row;
            }
            break;

        case 8:  
            {
                activityPicker = [[UIPickerView alloc] init];
                activityPicker.delegate = self;
                activityPicker.tag = indexPath.row;
                if ([text1.text isEqualToString:[privacyArray objectAtIndex:0]])
                    [activityPicker selectRow:0 inComponent:0 animated:YES];
                else
                    [activityPicker selectRow:1 inComponent:0 animated:YES];

                text1.delegate = self;
                text1.inputView = activityPicker;
            }
            break;

        case 9:  
        {
            text1.enabled = NO;
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
            break;

        default:
            break;
    }

    return cell;
}

Answer 1

您的问题是对所有行使用相同的单元格标识符 "Cell"。这会导致您已经为特定 行 配置的单元格重新加载并再次用于另一行。

假设您只有这 10 个单元设计，您可以:

NSString*        identifier = [NSString stringWithFormat: @"Cell-%d", indexPath.row];
UITableViewCell* cell       = [tableView dequeueReusableCellWithIdentifier:identifier
                                                              forIndexPath:indexPath];

这样，dequeueReusableCellWithIdentifier 将只返回先前为当前 indexPath 创建的单元格。