UICollectionView -Developing Filters UI Using Auto Resizing Cells

Developing Auto Resizing Cells based on content using UIStackView in UICollectionView

AutoResizable UICollectionView Cells- FiltersUI

One of the best ways to achieve a horizontally scrollable Filters UI is by using UICollectionView. A developers go-to is UICollectionView when it’s come to create a customised layout designs.

I personally use UICollectionView a lot because we can easily develop a complex layout designs using UICollectionView.

In this project, we are going to build a Filters UI Design using UICollectionView.

Filters UI Using CollectionView

While building Filter-UI, we are going to learn about:

• How to make UICollectionView’s contentView auto resizable based on its superview

• How to do selection and deselection in UICollectionView

Setup and Designing UICollectionView and it’s cells

Let’s get started by creating a new project in Xcode.

1. Storyboard Designing

• To make CollectionView cells resizable set size estimated size as Automatic

• Design a layout for UICollectionView cell’s FiltersUI

• Add UIStackView to CollectionView cell to adjust the filter based on the content.

• Set Alignment, Distribution and Spacing for UIStackView

• Set all constraints of FiltersView to fill with UICollectionView Cell’s ContentView, so that whenever content of ViewFilter is increase Content View of UICollectionView also increase.

Auto Resizable UICollectionView Cell based on its content.

• In this above gif file you can see that UICollectionView Cell’s content View reacts based on its content.

2. Delegate for UICollectionView

FiltersUI — CollectionView Delegate Methods

• Here I have given numberOfItems() in section based on the numbers of filters that user needs. Here is sample input for filters:

var filters = [“Working Days”,”Attendance”,”Late”,”OT Permission”,”Excess Break”,”Excess Stay”,”Leave”,”Holidays”,”Present Days”]

3. Selection and Deselection— UICollectionView

Selection and Deselection Delegate Methods

• To select an filter option, Use didSelectItemAt() delegate methods.

• When user select an filter cell, change filter text name’s label color and background of the cell

• Make use isSelected property and set it as true when the particular cell is selected.

• Whenever user wants to choose another filter option, we need to deselect the cell which is already selected and also make sure we select the cell the user have clicked on.

• To deselect before selection happens every time, use didDeselectItemAt() delegate method

• During deselection change the text Color and background color to normal and user can do whatever filter option he needs.

Resources:

Find the detailed ScreenShots and project code in this Github link. You can refer to it in case you have any queries.

The Project is Updated for Xcode 11+ and Swift 5.0