This section gives you an overview of the use of the IGGridView™ control. It contains information ranging from what the control does to the step-by-step procedures on how to accomplish common tasks using the control.
Click the links below to access important information about the IGGridView control.
A grid view is a single or multiple column view, which allows users to scroll through rows and cells both vertically and horizontally. The cells comprising the individual items of the grid are IGGridViewCellBase objects. These objects represent a specific column and row that users can insert, delete, and reorder, both on the invdiual cell level or row level.
A grid view is made up of zero or more sections, each with its own rows. Sections are identified by their index number within the grid view, rows are identified by their index number within a section and columns are identified by their index within a row. Any section can be optionally be preceded by a section header, and optionally followed by a section footer.
Grid views can have one of two styles, IGGridViewStyleDefault and IGGridViewStyleSingleCellPaging. When you create an IGGridView instance you must specify a grid style, and this style cannot be changed. If no style is chosen, the default style will be used. In the default style, cells and rows size to their column widths and row heights, and sections can display headers and footers. The single cell paging style, will only display a single cell sized to the size of the grid’s viewport. This type of style is useful for applications that would want to display one item at a time, such as an image viewer or a document reader.
Many methods of the IGGridView take IGRowPath or IGCellPath objects as parameters and return values. You can use the pathForRow:inSection: static method to create an IGRowPath and the the cellPathForRow:inSection:inColumn: static method to create an IGCellPath.
A IGGridView object must have an object that acts as a data source and an object that acts as a delegate; typically these objects are the application delegate. The data source must adopt the IGGridViewDataSource protocol and the delegate must adopt the IGGridViewDelegate protocol. The data source provides information that the grid view needs to construct tables and manages the data model when rows or cells of a table are inserted, deleted, or reordered. The delegate provides the cells used by the grid and performs other tasks, such as selection. To shorten development time you can take advantage of the IGGridViewDataSourceHelper object which simplifies the creation of cells and data management. There are a few different implementations of the data source helpers such as IGGridViewSingleRowSingleFieldDataSourceHelper and IGGridViewSingleFieldMultiColumnDataSourceHelper which offer different ways to display your linear data, such as treaing every row as a column.
IGGridView caches cells only for visible rows, but caches row, header, and footer heights for the entire grid. You can create custom cells by deriving from IGGridViewCellBase.
IGGridView calls reloadData only when you create a new instance of the IGGridView or when you assign a new data source. Reloading the grid view clears current state, including the current selection. If you would like to keep state, but refresh the current data that is being displayed in the grid view, you can call updateData.
To display a shortcut bar in the grid view, your datasource must implement the following methods: sectionIndexTitlesForGridView: gridView: sectionForSectionIndexTitle:atIndex:. You can then customize the appearance of the shortcut bar using the following properties of the grid view: shortcutBarColumnBackgroundView, shortcutBarColumnWidth and shorcutBarColor.
To implement a pull down to refresh mechanism similar to apps such as Facebook, your delegate must implement the updateRequestedInGridView: method. When you’'re done with refreshing you can then invoke the finishedUpdating method on the grid view. To control the height of the pull down you can set the pullDownRowHeight property of the grid view. To customize the content displayed in the pull down view you can implement the pullDownCellForGridView: method on your datasource.
This topic explains the requirements for adding the grid framework file to an Xcode project; a requirement for using the IGGridView control.
This topic provides basic information about creating an instance of the IGGridView and displaying data to help you get up and running with this control.
The topics in this group cover enabling, configuring, and using the IGGridView control’s supported features.
The IGGridView contains properties and methods that allow for easily wiring data and manipulating the data based on user interaction. This topic contains links to conceptual information and code snippets for connecting data.
This topic provides a conceptual overview of the supported themes available in the IGGridView control.