iphone - 如何在运行时将一行插入 iPhone 上的 UITableView？

Question

我创建了一个按钮，该按钮具有在运行时向 UITableView 添加一行的操作，但我的代码无法正常工作。我可以看到该行向下动画，但它仅在我的 UITableView 行上显示为动画未添加。我可以在此代码中执行哪些操作来查看单元格中添加的行？

我有 4 个部分，我想为第 0 行的第 1 个部分和第 0 行的第 2 个部分添加行:

-(IBAction)add:(id)sender
{
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    NSArray* path = [NSArray arrayWithObject:indexPath];

    // fill paths of insertion rows here
    [self.mytableview beginUpdates];
    [self.mytableview insertRowsAtIndexPaths:path withRowAnimation:UITableViewRowAnimationBottom];      
    [self.mytableview deleteRowsAtIndexPaths:path withRowAnimation:UITableViewRowAnimationBottom];
    [self.mytableview endUpdates];
    [self.mytableview reloadData];
}

#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 2;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    NSInteger rows;
    if (section==0) {
        rows = 4;
        //return    rowForSectionOne;
        //rows=rowForSectionOne++;
    }
    if (section == 1) 
    {
        rows = 1;
    }

    return rows;        
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [mytableview dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] autorelease];
    }

    if ([indexPath row] == 0 && [indexPath section] == 0)
    {
        cell.textLabel.text=@"Title";

        cell.accessoryView = textField;
        titlename=textField.text;
        [[cell imageView] setImage:[UIImage imageNamed:@"DetailViewDue.png"]];
        NSLog(@"******:%@",titlename);          
    }

    if ([indexPath row] == 1 && [indexPath section] == 0)
    {
        cell.textLabel.text=@"Tags";
        cell.detailTextLabel.text=app.Tags;
     [[cell imageView] setImage:[UIImage imageNamed:@"DetailViewTag.png"]];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }

    if ([indexPath row] == 2 && [indexPath section] == 0)
    {
        cell.textLabel.text=@"Notes";
        cell.detailTextLabel.text=app.Notes;
        [[cell imageView] setImage:[UIImage imageNamed:@"DetailViewNote.png"]];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    fromDate = [[dateFormat stringFromDate:selectionData.fromDateSelected]retain];

    if ([indexPath row] == 3 && [indexPath section] == 0)
    {
        cell.textLabel.text=@"DueDate";
        cell.detailTextLabel.text=fromDate;
        [[cell imageView] setImage:[UIImage imageNamed:@"DetailViewDue.png"]];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    }
    if ([indexPath row] == 0 && [indexPath section] == 1)
    {
        cell.textLabel.text=@"Attach";

    }

    return cell;
}

Answer 1

你做得对。假设按下按钮时 -(IBAction)add:(id)sender 被调用。然后将 indexPath 与适当的 row 和 section 组合起来。这里的部分是 0,1,2,3(因为你有 4 个部分 -

NSIndexPath *indexPath0 = [NSIndexPath indexPathForRow:0 inSection:0];
NSIndexPath *indexPath1 = [NSIndexPath indexPathForRow:0 inSection:1];
NSIndexPath *indexPath2 = [NSIndexPath indexPathForRow:0 inSection:2];
NSIndexPath *indexPath3 = [NSIndexPath indexPathForRow:0 inSection:3];    
//put these indexpaths in a NSArray

[tableView insertRowsAtIndexPaths:array withRowAnimation:UITableViewRowAnimationNone];

这应该会更新表格。无需在表格上执行 reloadData，因为您只添加一行(而不是更改整个表格)。还要确保 dataSource 每个部分都有这个新添加的条目，否则你的应用程序会崩溃