Question

所以我现在已经尝试了一段时间来创建一个带有可扩展部分和一个不可扩展部分的表视图。其中一个可扩展部分应包含3个文本字段，您可以在其中编辑文本字段内的测试。当你折叠部分并再次展开它时，我能够完成工作，文本字段突然在上面重复，有时会与上面的单元格交换。 Ihavent能够弄清楚为什么或如何让它不那样做。这个想法是当用户在字段中输入文本并选择输入文本存储到数组中时。

代码：

    - (void)viewDidLoad{
    [super viewDidLoad];

    if (!expandedSections){
        expandedSections = [[NSMutableIndexSet alloc] init];
    }
    manualSensorName = [[NSMutableArray alloc]initWithObjects: @"Sensor",@"",@"2",@"T", nil];
}

- (void)didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Expanding

- (BOOL)tableView:(UITableView *)tableView canCollapseSection:(NSInteger)section{
    if (section>0) return YES;

    return NO;
}


#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 3;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if ([self tableView:tableView canCollapseSection:section])
    {
        if ([expandedSections containsIndex:section])
        {
            return 5; // return rows when expanded
        }

        return 1; // only top row showing
    }

    // Return the number of rows in the section.
    return 1;
}

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

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Configure the cell...

    if ([self tableView:tableView canCollapseSection:indexPath.section]){
        if (!indexPath.row){
            // first row
            cell.textLabel.text = @"Expandable"; // only top row showing

            if ([expandedSections containsIndex:indexPath.section])
            {
                UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowUP.png"]];
                cell.accessoryView = arrow;
            }
            else
            {
                UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowDOWN.png"]];
                cell.accessoryView = arrow;
            }
        }
        else {
            if (indexPath.row == 1){
                NSString *flightNumText = [manualSensorName objectAtIndex:indexPath.row];
                cell.textLabel.text = flightNumText;
            }
            else if (indexPath.row == 2){
                txtManualSensor = [[UITextField alloc] initWithFrame:CGRectMake(180, 5, 120, 30)];
                txtManualSensor.placeholder = @"Select";
                txtManualSensor.delegate = self;
                txtManualSensor.autocorrectionType = UITextAutocorrectionTypeNo;
                txtManualSensor.backgroundColor = [UIColor whiteColor];
                [txtManualSensor setBorderStyle:UITextBorderStyleBezel];
                [txtManualSensor setTextAlignment:NSTextAlignmentCenter];
                [txtManualSensor setReturnKeyType:UIReturnKeyDone];
//                UITextField *playerTextField = [[UITextField alloc] initWithFrame:CGRectMake(180, 5, 120, 30)];
//                playerTextField.adjustsFontSizeToFitWidth = YES;
//                playerTextField.textColor = [UIColor blackColor];
//                playerTextField.placeholder = @"SAMPLE";
//                playerTextField.tag = 200;
//                playerTextField.delegate = self;
//                [cell.contentView addSubview:playerTextField];
                cell.textLabel.text = @"Sensor Name";
                [cell addSubview:txtManualSensor];
            }
            else if (indexPath.row == 3){
                cell.textLabel.text = @"Some Detail";
                cell.accessoryView = nil;
                cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
            }

        }
    }
    else {
        cell.accessoryView = nil;
        cell.textLabel.text = @"Normal Cell";

    }

    return cell;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
    [manualSensorName replaceObjectAtIndex:2 withObject:textField.text];
    return YES;
}
-(BOOL) textFieldShouldReturn:(UITextField *)textField{

    [textField resignFirstResponder];
    return YES;
}

// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}


#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    if ([self tableView:tableView canCollapseSection:indexPath.section]){
        if (!indexPath.row){
            [tableView beginUpdates];

            // only first row toggles exapand/collapse
            [tableView deselectRowAtIndexPath:indexPath animated:YES];

            NSInteger section = indexPath.section;
            BOOL currentlyExpanded = [expandedSections containsIndex:section];
            NSInteger rows;

            NSMutableArray *tmpArray = [NSMutableArray array];

            if (currentlyExpanded) {
                rows = [self tableView:tableView numberOfRowsInSection:section];
                [expandedSections removeIndex:section];
            }
            else {
                [expandedSections addIndex:section];
                rows = [self tableView:tableView numberOfRowsInSection:section];
            }

            for (int i=1; i<rows; i++) {
                NSIndexPath *tmpIndexPath = [NSIndexPath indexPathForRow:i inSection:section];
                [tmpArray addObject:tmpIndexPath];
            }

            UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
            if (currentlyExpanded) {
                UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowDOWN.png"]];
                [tableView deleteRowsAtIndexPaths:tmpArray
                                 withRowAnimation:UITableViewRowAnimationFade];
                cell.accessoryView = arrow;
            }
            else {
                UIImageView *arrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"arrowUP.png"]];
                [tableView insertRowsAtIndexPaths:tmpArray
                                 withRowAnimation:UITableViewRowAnimationFade];
                cell.accessoryView =  arrow;
            }
            NSLog(@"tableview row is %ld in section %ld",(long)indexPath.row,(long)indexPath.section);
            [tableView endUpdates];
        }
        [tableView deselectRowAtIndexPath:indexPath animated:YES];
        NSLog(@"selected row is %ld in section %ld",(long)indexPath.row,(long)indexPath.section);
        if (indexPath.row == 1) {
            // update text fields in cell table view
        }
    }
}

Answer 1

可能就像用UITableViewRowAnimationTop替换UITableViewRowAnimationFade一样简单：
更改didSelectRowAtIndexPath中的索引时，UITableViewCells会更改物理位置（请记住UITableView是UIScrollView），并且滚动条无法跟踪您的意图是。

UITableViewRowAnimationTop尝试调整滚动位置，但失败了。

其他设计考虑因素：

不要将模型（要显示的数据数组）与视图模型（显示模型的UI）混合。在didSelectRowAtIndexPath中，您应首先重新订购模型，然后将其应用于单元格
考虑不要动态更改索引：您可能更喜欢实际反映视图结构的模型，即树。
您是否注意到您不尊重- (void)tableView:(UITableView *)tableView，有时在同一方法中使用self tableView:tableView或self.customTableView？您应该使用传递给您的tableView。

可以使用文本字段扩展的Tableview单元格会导致文本字段跳转

1 个答案: