Scrollview and its usage in Swift have been ubiquitously utilized components in Mobile Application Development. Swift, being a robust and time-efficient language developed by Apple, provides multiple features enhancing user interface and user experience, one of them being Scrollview. The Scrollview facilitates displaying content more than what the screen can only hold by enabling users to scroll and view the content. However, sometimes the visibility of the scrollbar within the Scrollview can be a bit distracting, or developers might want to add their custom scrollbar design.
How to Hide the Scrollbar in ScrollView?
In Swift, hiding a scrollbar in Scrollview is not a gargantuan task. Apple has given built-in properties to handle this specific situation. A scrollbar can be hidden by setting the showsVerticalScrollIndicator and showsHorizontalScrollIndicator properties to false.
let scrollView = UIScrollView() scrollView.showsVerticalScrollIndicator = false scrollView.showsHorizontalScrollIndicator = false
The aforementioned properties allow you to set the visibility of the vertical and horizontal scroll indicators respectively. By setting the property to false, we indicate that the scrollbar should be hidden.
Understanding the Code
The Swift language is designed to be easy to read and write while still being powerful. Looking at the code snippet, you see that:
- [
let scrollView = UIScrollView()
]
- We are initializing the UIScrollView object.
- [
scrollView.showsVerticalScrollIndicator = false scrollView.showsHorizontalScrollIndicator = false
]
- These two lines of code are used to hide the scrollbars. The first line hides the vertical scrollbar while the second line hides the horizontal scrollbar. This can be done during the setup of the UIScrollView object.
The hidden scrollbars do not affect the user’s ability to scroll, and these parameters can be altered based on developers’ needs, providing the developers with the ability to completely manipulate the scroll bar visibility.
Applying scrollView Properties and Handling Touch Events
Swift also provides a multitude of properties and methods that developers can apply to manage touch events efficiently on a scrollView.
scrollView.delaysContentTouches = false scrollView.canCancelContentTouches = true
The delaysContentTouches property is used to determine how the receiver responds to the touchdown events—the default value is true. If set to false, the scroll view touch will immediately invoke touchesShouldBegin(_:with: in:) on control touch-drag event occur. On the other hand, canCancelContentTouches property dictates whether scrolling would cancel the touch events. When a user moves their finger and scrolls, and if the property is set to true, it rescinds any touches within the view.
UIScrollView Delegate
UIScrollView delegate functions provide more control on scroll view behavior and work on customizing it.
scrollView.delegate = self
By setting the delegate of the scroll view, you can manage and take actions on events like scrolling started, scrolling ended, view is zooming, etc., which could be significant from the performance perspective of an app.
This sums up the Scroll View usage, handling scroll bar visibility, touch events, and delegating control. Swift, with its inclusive library, hands the developers the power to build interactive and user-friendly interfaces.
