How to get the height of a UILabel in Swift? - swift

Question

I am a beginner in Swift and I am trying to get the height of a label.
The label has multiple lines of text. I want to know the total height it occupies on the screen.

Answer 1

Swift 4 with extension
extension UILabel{
public var requiredHeight: CGFloat {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: frame.width, height: CGFloat.greatestFiniteMagnitude))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.byWordWrapping
label.font = font
label.text = text
label.attributedText = attributedText
label.sizeToFit()
return label.frame.height
}
}

Answer 2

it's simple, just call
label.bounds.size.height

Answer 3

Updated for Swift 3
func estimatedHeightOfLabel(text: String) -> CGFloat {
let size = CGSize(width: view.frame.width - 16, height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attributes = [NSFontAttributeName: UIFont.systemFont(ofSize: 10)]
let rectangleHeight = String(text).boundingRect(with: size, options: options, attributes: attributes, context: nil).height
return rectangleHeight
}
override func viewDidLoad() {
super.viewDidLoad()
guard let labelText = label1.text else { return }
let height = estimatedHeightOfLabel(text: labelText)
print(height)
}

Answer 4

Swift 5 ioS 13.2 tested 100%, best solution when the UILabel numberOfLines = 0
Note, result is rounded. Just remove ceil() if you don't want it.
If you want to get height -> give storyboard width of UILabel
If you want to get width -> give storyboard height of UILabel
let stringValue = ""//your label text
let width:CGFloat = 0//storybord width of UILabel
let height:CGFloat = 0//storyboard height of UILabel
let font = UIFont(name: "HelveticaNeue-Bold", size: 18)//font type and size
func getLableHeightRuntime() -> CGFloat {
let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)
let boundingBox = stringValue.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil)
return ceil(boundingBox.height)
}
func getLabelWidthRuntime() -> CGFloat {
let constraintRect = CGSize(width: .greatestFiniteMagnitude, height: height)
let boundingBox = stringValue.boundingRect(with: constraintRect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil)
return ceil(boundingBox.width)
}

Answer 5

#iajmeri43's answer Updated for Swift 5
func estimatedLabelHeight(text: String, width: CGFloat, font: UIFont) -> CGFloat {
let size = CGSize(width: width, height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attributes = [NSAttributedString.Key.font: font]
let rectangleHeight = String(text).boundingRect(with: size, options: options, attributes: attributes, context: nil).height
return rectangleHeight
}
To use it:
// 1. get the text from the label
guard let theLabelsText = myLabel.text else { return }
// 2. get the width of the view the label is in for example a cell
// Here I'm just stating that the cell is the same exact width of whatever the collection's width is which is usually based on the width of the view that collectionView is in
let widthOfCell = self.collectionView.frame.width
// 3. get the font that your using for the label. For this example the label's font is UIFont.systemFont(ofSize: 17)
let theLabelsFont = UIFont.systemFont(ofSize: 17)
// 4. Plug the 3 values from above into the function
let totalLabelHeight = estimatedLabelHeight(text: theLabelsText, width: widthOfCell, font: theLabelsFont)
// 5. Print out the label's height with decimal values eg. 95.46875
print(totalLabelHeight)
// 6. as #slashburn suggested in the comments, use the ceil() function to round out the totalLabelHeight
let ceilHeight = ceil(totalLabelHeight)
// 7. Print out the ceilHeight rounded off eg. 95.0
print(ceilHeight)