Text not vertically centered in UILabel

问题

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 ?

回答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

回答2:

Thanks to @rintaro, it works finally.

One more thing for my case, it didn't work because I was setting ByWordWrapping. I had to set lineBreakMode as ByClipping.

来源：https://stackoverflow.com/questions/26649909/text-not-vertically-centered-in-uilabel