![flowlayout options not available with panel object flowlayout options not available with panel object](http://4.bp.blogspot.com/-9cgvTaEPM9o/T5x3c86GekI/AAAAAAAAB7U/whQLC56xd8Y/s1600/02-ManageTab-SettingsPanel-AdditionalSettingsFlyout-Arrowheads.png)
![flowlayout options not available with panel object flowlayout options not available with panel object](https://i.stack.imgur.com/olhx5.png)
With these requirements in mind, select the MyFlowLayout.h file and modify it as follows: #import MyFlowLayout : (strong, nonatomic) NSIndexPath (nonatomic) CGPoint (nonatomic) CGFloat the scale and center properties are changed, it will be necessary to invalidate the layout so that the collection view is updated and the cell redrawn at the new size and location on the screen. Since the new layout class is going to allow cells to be dragged around and resized by the user, it will need some properties to store a reference to the cell being manipulated, the scale value by which the cell is being resized and, finally, the current location of the cell on the screen. The new layout class is now created and ready to be extended to add the new functionality. By far the easiest way to achieve this is to subclass UICollectionViewFlowLayout class and extend it to provide the desired layout behavior.
![flowlayout options not available with panel object flowlayout options not available with panel object](https://docs.blender.org/manual/en/dev/_images/physics_collision_panel.png)
In the event that the UICollectionViewFlowLayout class does not provide the necessary behavior for an application, therefore, it can be replaced with a custom layout object that does. One of the most powerful features of collection views is the ability to switch out one layout object for another in order to change both the way in which cells are presented to the user, and the way in which that layout responds to user interaction. In this, the final chapter on the subject of collection views in iOS 6, the UICollectionViewFlowLayout class will be extended to provide custom layout behavior for the CollectionDemo application created in the previous chapter.Īs previously described, whilst the collection view is responsible for displaying data elements in the form of cells, it is the layout object that controls how those cells are to be arranged and positioned on the screen. SwiftUI Essentials – iOS 15 Edition book is now available in Print ($39.99) and eBook ($29.99) editions. Learn SwiftUI and take your iOS Development to the Next Level