![]() Rows and columns in table layout mode support three size types (which can be selected with the RowDefinition.SizeType and ColumnDefinition.SizeType properties): Absolute, Percent and AutoSize. The image below shows the resulting table layout with three rows and three columns. ' Add one new column whose width is set to 50%.ĭim columnDefinition As New ColumnDefinition(layoutControlGroup, 50, SizeType.Percent) ' Add one more row whose height is set to 50%.ĭim rowDefinition As New RowDefinition(layoutControlGroup, 50, SizeType.Percent) ' Two rows and two columns are automatically created. ' Enable table mode for the target group. Add one new column whose width is set to 50%.ĬolumnDefinition columnDefinition = new ColumnDefinition(layoutControlGroup, 50, SizeType.Percent) RowDefinition rowDefinition = new RowDefinition(layoutControlGroup, 50, SizeType.Percent) Add one more row whose height is set to 50%. Two rows and two columns are automatically created. Enable table mode for the target group. In addition to existing two rows and two columns, one more row and one more column are created. The following code enables table layout mode. ColumnDefinitions.Add and ColumnDefinitions.AddRange.RowDefinitions.Add and RowDefinitions.AddRange.To append an existing RowDefinition or ColumnDefinition object to corresponding collections, use the following methods. To add new rows and columns with default settings in code, use the OptionsTableLayoutGroup.AddRow and OptionsTableLayoutGroup.AddColumn methods. See the Cell Size Options section below to learn more about supported size types and their specifics. This means that each of them currently occupies 50% of the total group width/height. Make a note that the SizeType property of columns and rows is set to Percent and their size is set to 50. The OptionsTableLayoutGroup.RowDefinitions and OptionsTableLayoutGroup.ColumnDefinitions collections are accessible from the LayoutGroup.OptionsTableLayoutGroup property.Īt design time, you can customize the row and column collections using dedicated editors, which can be invoked by clicking the ellipsis button for the OptionsTableLayoutGroup.RowDefinitions and OptionsTableLayoutGroup.ColumnDefinitions properties, respectively. To add a new column to the table, add a ColumnDefinition object to the OptionsTableLayoutGroup.ColumnDefinitions collection, which stores available columns. To create a new row in the table, add a RowDefinition object to the OptionsTableLayoutGroup.RowDefinitions collection, which stores available rows. They divide the group client area into four equal cells. When table layout mode is enabled, two rows and two columns are automatically created. You can enable table layout mode for a group at design time using a context menu. LayoutControlGroup.LayoutMode = LayoutMode.Table You can then assign the layout to your collection view by writing the following in your viewDidLoad() method: = LayoutMode.Table If you want to follow along with the code samples in this post, I would recommend that you always put your compositional layout code in a method, as I will soon demonstrate. I'm going to assume that you have already got a collection view setup, possibly with a diffable data source. Since it's such a familiar and relatively simple layout, I want to explore the basics of UICollectionViewCompositionalLayout with you by using it to build a grid. It's so common that Apple has included a grid layout called UICollectionViewFlowLayout with iOS since they introduced UICollectionView in iOS 6. Building a grid layoutĪ very common use of collection views is to display a grid layout. ![]() I will first show you how to build a simple grid layout, and from there we'll continue working our way towards the end result.
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