Text not vertically centered in UILabel

Question

I've created a Label with the following code :

func setupValueLabel() {
    valueLabel.numberOfLines = 1
    valueLabel.font = UIFont(name: "Avenir-Black", size: 50)
    valueLabel.adjustsFontSizeToFitWidth = true
    valueLabel.clipsToBounds = true
    valueLabel.backgroundColor = UIColor.greenColor()
    valueLabel.textColor = valuesColor
    valueLabel.textAlignment = NSTextAlignment.Center
}

I don't really understand why but the label is not vertically centered :

Do I have to do anything specific so it can be centered ?

Answer 1

The problem is that font size is shrunk by adjustsFontSizeToFitWidth = true, but it does not adjust the lineHeight automatically. It remains to be for original font size that is 50.

By default, the text is aligned to its baseline. you can adjust it with baselineAdjustment property.

In your case, you should set it to UIBaselineAdjustment.alignCenters.

valueLabel.baselineAdjustment = .alignCenters