ios - 表格中的复选框

Question

我想在表格中为每个表格行添加一个复选框（或者如果复选框是一个更好的名称）。一个简单的小框，用于标记是否读取了一行。只是为了记住。当我关闭应用程序时，当然要保存。如果应用程序更新，也仍然保持不变。

有没有简单的方法可以做到这一点？
周围有样品吗？

Answer 1

在下面的代码中，我使用了一个代码来制作待办事项列表，这里我使用了两个NSMutableArray itsToDoTitle和itsToDoChecked来填充表格行..我希望这会对你有所帮助..

您可以拥有itsToDoTitle和itsToDoChecked数组，NSUserDefaults或者您可以写入一些属性文件，以便再次拥有相同的列表。

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


    NSString *CellIdentifier = @"ToDoList";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) 
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                       reuseIdentifier:CellIdentifier] autorelease];

        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }

    cell.textLabel.text = [itsToDoTitle objectAtIndex:indexPath.row];
    cell.textLabel.font = [UIFont systemFontOfSize:14.0];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    cell.selectionStyle = UITableViewCellSelectionStyleBlue;


    BOOL checked =  [[itsToDoChecked objectAtIndex:indexPath.row] boolValue];
    UIImage *image = (checked) ? [UIImage imageNamed:@"checked.png"] : [UIImage imageNamed:@"unchecked.png"];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    CGRect frame = CGRectMake(0.0, 0.0, image.size.width, image.size.height);
    button.frame = frame;   // match the button's size with the image size
    button.tag = indexPath.row;
    [button setBackgroundImage:image forState:UIControlStateNormal];

    // set the button's target to this table view controller so we can interpret touch events and map that to a NSIndexSet
    [button addTarget:self action:@selector(checkButtonTapped:event:) forControlEvents:UIControlEventTouchUpInside];
    cell.accessoryView = button;

    return cell;
}


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

    BOOL checked = [[itsToDoChecked objectAtIndex:indexPath.row] boolValue];
    [itsToDoChecked removeObjectAtIndex:indexPath.row];
    [itsToDoChecked insertObject:(checked) ? @"FALSE":@"TRUE" atIndex:indexPath.row];
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    UIButton *button = (UIButton *)cell.accessoryView;

    UIImage *newImage = (checked) ? [UIImage imageNamed:@"unchecked.png"] : [UIImage imageNamed:@"checked.png"];
    [button setBackgroundImage:newImage forState:UIControlStateNormal];

    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Save"
                                                                   style:UIBarButtonItemStylePlain target:self action:@selector(saveChecklist:)];
    self.navigationItem.rightBarButtonItem = backButton;
    [backButton release];

}