adjustsFontSizeToFitWidth making text too small/ trying to check font size - ios

Question

I am creating multiple buttons in my code, each one grabbing its text from separate arrays. I AM using the adjustsFontSizeToFitWidth = true (That was the only thing I could find that would automatically resize the text, so it fits within the frame of the button). However, when some the text adjusts, it can get ridiculously small; it's definitely smaller than it needs to be. Is there any way you can make sure the text only sizes as much as it needs to?
override func viewDidLoad() {
super.viewDidLoad()
correctWord.text = correctAnswer[questionNumber]
correctWord.frame = CGRectMake(0, 0, 1 * self.view.frame.width / 4, 1.5 * self.view.frame.height / 22)
correctWord.center = CGPointMake(self.view.bounds.width / 2, 14.25 * self.view.bounds.height / 22)
correctWord.textAlignment = NSTextAlignment.Center
correctWord.numberOfLines = 1
correctWord.font = UIFont(name: "Chalkboard SE", size: 60)
correctWord.textColor = UIColor.greenColor()
correctWord.adjustsFontSizeToFitWidth = true
correctWord.baselineAdjustment = .AlignCenters
correctWord.minimumScaleFactor = 0.1
self.view.addSubview(correctWord)
I DID try a code that I saw while searching (found below). I created a function for the code to update the text size, and I called it before self.view.addSubview(correctWord). But, the button never appears. And, is there a way you can check to see what the font size actually is? When I print currentSize to the logs to determine the font size, it always says "0". I am trying to determine which text's size is the smallest, so all of the buttons can be set to the same font size.
func adjustFontSizeToFitRect(rect : CGRect){
if correctWord.text == nil{
return
}
correctWord.frame = rect
let maxFontSize: CGFloat = 100.0
let minFontSize: CGFloat = 5.0
var q = Int(maxFontSize)
var p = Int(minFontSize)
let constraintSize = CGSize(width: rect.width, height: CGFloat.max)
while(p <= q){
currentSize = (p + q) / 2
correctWord.font = UIFont(name: "Chalkboard SE", size: CGFloat(currentSize))
let textRect = correctWord.text!.boundingRectWithSize(constraintSize, options: .UsesLineFragmentOrigin, attributes: nil, context: nil)
let labelSize = textRect.size
if labelSize.height < correctWord.frame.height && labelSize.height >= correctWord.frame.height-10 && labelSize.width < correctWord.frame.width && labelSize.width >= correctWord.frame.width-10 {
break
}else if labelSize.height > correctWord.frame.height || labelSize.width > correctWord.frame.width{
q = currentSize - 1
}else{
p = currentSize + 1
}
}
}