Why row height is squeezing after scroll for tableView in swift? - ios

Question

I am using a tableView and with the tableView I am using a label and my requirement is to make the label auto-adjusting according to the text. So I am calculating dynamic height for my label. It is working fine initially but after scroll the height of the label is reduced. I don't know why.
// to calculate dynamic height of the label
func height(constraintedWidth width: CGFloat, font: UIFont) -> CGFloat {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: .greatestFiniteMagnitude))
label.numberOfLines = 0
label.lineBreakMode = .byWordWrapping
label.text = self
label.font = font
label.sizeToFit()
return label.frame.height
}

Answer 1

you can try!
extension UILabel {
func textWidth() -> CGFloat {
return UILabel.textWidth(label: self)
}
func textHeight() -> CGFloat {
return UILabel.textHeight(withWidth: self.frame.width, font: self.font, text: self.text ?? "")
}
class func textWidth(label: UILabel) -> CGFloat {
return textWidth(label: label, text: label.text!)
}
class func textWidth(label: UILabel, text: String) -> CGFloat {
return textWidth(font: label.font, text: text)
}
class func textWidth(font: UIFont, text: String) -> CGFloat {
return textSize(font: font, text: text).width
}
class func textHeight(withWidth width: CGFloat, font: UIFont, text: String) -> CGFloat {
return textSize(font: font, text: text, width: width).height
}
class func textSize(font: UIFont, text: String, extra: CGSize) -> CGSize {
var size = textSize(font: font, text: text)
size.width = size.width + extra.width
size.height = size.height + extra.height
return size
}
class func textSize(font: UIFont, text: String, width: CGFloat = .greatestFiniteMagnitude, height: CGFloat = .greatestFiniteMagnitude) -> CGSize {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: height))
label.numberOfLines = 0
label.font = font
label.text = text
label.sizeToFit()
return label.frame.size
}
class func countLines(font: UIFont, text: String, width: CGFloat, height: CGFloat = .greatestFiniteMagnitude) -> Int {
// Call self.layoutIfNeeded() if your view uses auto layout
let myText = text as NSString
let rect = CGSize(width: width, height: height)
let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: font], context: nil)
return Int(ceil(CGFloat(labelSize.height) / font.lineHeight))
}
func countLines(width: CGFloat = .greatestFiniteMagnitude, height: CGFloat = .greatestFiniteMagnitude) -> Int {
// Call self.layoutIfNeeded() if your view uses auto layout
let myText = (self.text ?? "") as NSString
let rect = CGSize(width: width, height: height)
let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: self.font], context: nil)
return Int(ceil(CGFloat(labelSize.height) / self.font.lineHeight))
}
}