如何使用目标c在iphone上的表格视图上应用复选标记？

Question

我试图在表视图中申请复选标记,但它不起作用,如果我再次在该单元格再次检查然后选中标记应用.但不适用于新选择的单元格.有谁帮助我....

谢谢aamir.

即时使用以下代码

#pragma mark -
#pragma mark Table Data Source Methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger) tableView:(UITableView *) tableView numberOfRowsInSection:(NSInteger) section
{
    return [self.chaptersList count];
}

-(UITableViewCell *) tableView:(UITableView *) tableView cellForRowAtIndexPath:(NSIndexPath *) indexPath
{



static NSString *CheckMarkCellIdentifier = @"CheckMarkCellIdentifier";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CheckMarkCellIdentifier];

if ( cell == nil)
{
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CheckMarkCellIdentifier] autorelease];
}

NSUInteger row = [indexPath row];
NSUInteger oldRow = [lastIndexPath row];

cell.textLabel.text = [chaptersList objectAtIndex:row];
cell.textLabel.font = [UIFont boldSystemFontOfSize:14];
cell.accessoryType = (row == oldRow && lastIndexPath != nil) ? 
UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;

return cell;
}

#pragma mark -
#pragma mark Table Delegate Methods
- (void) tableView:(UITableView *) tableView didSelectRowAtIndexPath:(NSIndexPath *) indexPath
{
    int row = [indexPath row];
    int oldRow = [lastIndexPath row];
    if (row != oldRow)
    {
        UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
        newCell.accessoryType = UITableViewCellAccessoryCheckmark;

        UITableViewCell *oldCell = [tableView cellForRowAtIndexPath: lastIndexPath]; 
        oldCell.accessoryType = UITableViewCellAccessoryNone;

        lastIndexPath = indexPath;  
    }

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

Answer 1

你的意思是当你第一次选择第一行时,勾选标记不适用吗？您可以在代码中添加else语句,但在运行代码时会浪费一些时间.

if (newRow != oldRow)
{
    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryCheckmark;

    UITableViewCell *oldCell = [tableView cellForRowAtIndexPath: lastIndexPath]; 
    oldCell.accessoryType = UITableViewCellAccessoryNone;

    lastIndexPath = indexPath;  
}
else
{
    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
    newCell.accessoryType = UITableViewCellAccessoryCheckmark;
    lastIndexPath = indexPath;
}