How to get the height of a UILabel in Swift?

问题

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.

回答1:

it's simple, just call

label.bounds.size.height

回答2:

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
  }
}

回答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)
}

回答4:

@iajmeri43's answer Updated for Swift 4

func estimatedLabelHeight(text: String, width: CGFloat, font: UIFont) -> CGFloat {

    let size = CGSize(width: width, height: 1000)

    let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)

    let attributes = [NSAttributedStringKey.font: font]

    let rectangleHeight = String(text).boundingRect(with: size, options: options, attributes: attributes, context: nil).height

    return rectangleHeight
}

To use it (step 4):

// 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)

回答5:

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)
    }

来源：https://stackoverflow.com/questions/36508921/how-to-get-the-height-of-a-uilabel-in-swift

标签

swift

uilabel