Adjust font size to fit label height - Swift 4, Xcode 9

Question

How do we increase the font size of label to match the height of the label?

In Swift 4 or Storyboard for Xcode 9, either programmatically or via interface builder.

I have attempted the following, which has been claimed to work by a few in Swift 3. - SO Q&A

label.minimumScaleFactor = 0.1
label.adjustsFontSizeToFitWidth = true
label.lineBreakMode = .byClipping
label.numberOfLines = 0

For testing purposes, I created a label that is the width of the screen and the height of the screen, yet the font size remains the default size. I also made the settings in the interface builder match that of the code above, with equally unsuccessful results.

Answer 1

Have a simply solution for this. We can increase size default of label to 100 and set property min font size of the label ~ 1. I dont remember exactly this property. Im on mobile

Answer 2

在情节提要板上设置标签，然后将字体大小设置为最大值，然后在属性检查器中设置标签的属性最小字体大小，然后根据screwn大小进行调整。

Answer 3

Answering my own question. Answer found buried in the post I linked above.

If your UILabel has a fixed height, whether it be by points or by a multiplier of a superview, the font size can be set to any fraction of that height with one line of code:

testLabel.font = testLabel.font.withSize(testLabel.frame.height * 2/3)

where 2/3 is the height fraction of the label the text occupies.