CODEWITHSUNDEEP
swiftuiviewuilabeluitextview
David
David

Reputation: 839

How to completely hide a UITextView in swift?

I have a UITextView in a UIView that I would like the user to be able to show and hide by tapping on it. The UITextView and a constraint of 10 on each side. Currently when a user taps on the view the text does disappear, however you can still see where the UITextView is because there is about one line of space where the UITextView was.

Here is the code I use to adjust the visibility of the UITextView:

if(collapseArray[indexPath.row]){
    cell.noteText?.text = nil
}else{
    cell.noteText?.text = notesArray[indexPath.row]
}

I have tried setting the .isHidden attribute but I get the same results. I was able to get the desired result when I used a UILabel however I would like the text to be editable.

Here is what I am talking about

not hidden: enter image description here

hidden: enter image description here

As you can see there is still a large about of space below the word test, which is a UILabel that has constraints of 10 all the way around.

Here is the code I used for the given answer below:

class NoteTableViewCell: UITableViewCell, UITextViewDelegate {
    
    @IBOutlet weak var noteTitle: UILabel!
    @IBOutlet weak var noteText: UITextView!
    @IBOutlet weak var cardView: UIView!
    
    var textViewHeightConstraint: NSLayoutConstraint!
    
    override class func awakeFromNib() {
        textViewHeightConstraint = noteText.heightAnchor.constraint(equalToConstant: 0)
        textViewHeightConstraint.priority = .defaultLow
        textViewHeightConstraint.isActive = true
    }
}

however this gives me the error:

Instance member 'noteText' cannot be used on type 'NoteTableViewCell'

Upvotes: 0

Views: 261

Answers (1)

Sandeep Bhandari
Sandeep Bhandari

Reputation: 20379

In your cell, hold a reference to height constraint of textView var textViewHeightConstraint: NSLayoutConstraint!, probably in awakefromNib, be aware that constant is 0 and priority is low

        textViewHeightConstraint = noteText.heightAnchor.constraint(equalToConstant: 0)
        textViewHeightConstraint.priority = .defaultLow
        textViewHeightConstraint.isActive = true

In your logic, toggle the priority of constraint

if(collapseArray[indexPath.row]){
    cell.textViewHeightConstraint.priority = .required //this should set textView height to 0
}else{
    cell.textViewHeightConstraint.priority = .defaultLow //this should set it back
}
cell.textViewHeightConstraint.isActive = true
cell.layoutIfNeeded()

EDIT:

As OP is facing issue with initializing constraint property in awakeFromNib, I am updating the answer below

class NoteTableViewCell: UITableViewCell, UITextViewDelegate {

    @IBOutlet weak var noteTitle: UILabel!
    @IBOutlet weak var noteText: UITextView!
    @IBOutlet weak var cardView: UIView!

    var textViewHeightConstraint: NSLayoutConstraint!

    override func awakeFromNib() {
        super.awakeFromNib()
        textViewHeightConstraint = noteText.heightAnchor.constraint(equalToConstant: 0)
        textViewHeightConstraint.priority = .defaultLow
        textViewHeightConstraint.isActive = true
    }
}

You are supposed to use override func awakeFromNib() not override class func awakeFromNib() also you are supposed to call super.awakeFromNib() before you go ahead and initialize your constraint, super.awakeFromNib() will ensure your IBOutlets are initialized by the time your first statement to initialize constraint executes.

Upvotes: 1

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