Swipe actions in iOS Swift - UI Render Trace

Component - Swipe actions

This UI component allows users to swipe a list item left or right to reveal quick action buttons like Delete or Edit. It improves usability by letting users perform common tasks directly from the list.

Widget Tree

UITableView
└── UITableViewCell
    ├── ContentView
    │   └── UILabel (Item title)
    └── SwipeActions
        ├── LeadingSwipeActionsConfiguration (optional)
        └── TrailingSwipeActionsConfiguration

The main view is a UITableView showing a list. Each row is a UITableViewCell containing a label for the item text. Swipe actions are attached to each cell, configured on the leading (left) or trailing (right) side to show buttons when swiped.

Render Trace - 4 Steps

Step 1: UITableView

Step 2: UITableViewCell

Step 3: UISwipeActionsConfiguration

Step 4: UIContextualAction

State Change - Re-render

Trigger:User swipes a table view cell left

Before

Cell shows only the item label with no buttons visible

→

After

Swipe action buttons (Delete, Edit) appear behind the cell

Re-renders:The swiped UITableViewCell re-renders to show the swipe buttons

UI Quiz - 3 Questions

What happens when you swipe a cell to the left in this UI?

A Nothing happens

B Swipe action buttons appear on the right side of the cell

C The cell deletes immediately

D The cell moves to the top of the list

Key Insight

Swipe actions let users quickly access common tasks without leaving the list. Configuring them on UITableViewCells improves app efficiency and user satisfaction by reducing taps and navigation.