Swift 3 - Adjust Font Size to Fit Width, Multiple Lines

Question

I have a UILabel and it is set to 42.0 pt font, and the width of the label is set using autoconstraints based on factors other than the label itself (aka the things to the right

Answer 1

Swift 5

extension UILabel{
func adjustsFontSizeToFit(maxFontSize:CGFloat,width:CGFloat,height:CGFloat) {
    self.numberOfLines = 0
    var fontSize:CGFloat = maxFontSize
    if self.sizeThatFits(CGSize(width: width, height: .infinity)).height > height{
        while self.sizeThatFits(CGSize(width: width, height: .infinity)).height > height{
            fontSize -= 1
            self.font = self.font.withSize(fontSize)
        }
    }
}

}