Swift - Adjusting fontSize to fit the width of the layout (programmatically)

Try the following commands for your label:

label.adjustsFontSizeToFitWidth = true
label.minimumScaleFactor = 0.2

And try to change the lines of the label to 0 and 1 (check both cases):

label.numberOfLines = 0 // or 1

MinimumScaleFactor range is 0 to 1. So we are setting the MinimumScaleFactor with respect to our font size as follows

Objective C

[lb setMinimumScaleFactor:10.0/[UIFont labelFontSize]];
lb.adjustsFontSizeToFitWidth = YES;

Swift 3.0

lb.minimumScaleFactor = 10/UIFont.labelFontSize
lb.adjustsFontSizeToFitWidth = true

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