How to set scrollview height programmatically

user_3973157 0
Viewed 6991

How can I set the scrollview height programmatically in Xcode 9 with Swift 4? I've set a constraint for the scrollview height and added that as an outlet. But when I change the outlet constant value programmatically it doesn't change the height.

Example:

@IBOutlet weak var scrollview_height: NSLayoutConstraint!

override func viewDidLoad() {
     super.viewDidLoad()
     self.scrollview_height.constant = 245
}
swift uiscrollview ios
2 Answers

The height of the ScrollView should be given by it's content and not for you to change manually. At best if you want to do something like that, you have a view inside the scrollView and change the size of that view instead.

Step-by-step:

  • Add a ScrollView to your view. Set it's constraints (no height or width)
  • Add a View inside the ScrollView and set it's constraints. Additionally for a vertical scroll you might want to set it's width equal to the SuperView and ensure it has a height.
  • Create an IBOutlet for the height of the view
  • update the constant value of the constraint in code
  • If it does not update as expected, run a layoutIfNeeded on your superview after updates
user_68845840

You have to increase the content Size of your scrollView instead of increasing the frame of scrollView.

self.scrollview.contentSize = CGSize(width: screenWidth, height: yourDesiredHeight)

the scrollable contentSize of scrollView will change According to it.

user_92314250
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