How do I center text in Swift?

Question

In a Swift playground, how do I center a UILabel inside of a UIViewController?

When I use title.center = CGPoint(x: vc.view.frame.width / 2, y: 20) the text goes off of the screen.

This is the problem

If it helps, here's my code.

import UIKit
import PlaygroundSupport


// Set up ViewController and other things
var vc = UIViewController()
vc.view.frame.size.height = 75
vc.view.backgroundColor = .white

let title = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
title.textAlignment = .center
title.center = vc.view.center
title.text = "Which code is correct?"
vc.view.addSubview(title)

PlaygroundPage.current.liveView = vc

@Harambe Squad http://stackoverflow.com/questions/34645943/how-to-center-uilabel-in-swift — Tushar Sharma, Apr 02 '17 at 11:28
title.center = GCPoint(x:self. view .bounds.size.width / 2.0, y:self. view .bounds.size.height / 2.0) — Anbu.Karthik, Apr 02 '17 at 11:29
Possible duplicate of [How to center UILabel in Swift?](http://stackoverflow.com/questions/34645943/how-to-center-uilabel-in-swift) — Tamás Sengel, Apr 02 '17 at 11:34

score 2 · Accepted Answer · answered Apr 02 '17 at 11:43

The special problem with swift playgrounds is, that the actual frame of the view controller will only be updated correctly, after the view is loaded / displayed on screen. That means putting the line for centering the label after the line for setting the live view should help:

PlaygroundPage.current.liveView = vc
title.center = vc.view.center
vc.view.addSubview(title)

0xNSHuman · Answer 2 · 2017-04-02T11:32:57.180

If we're talking about top view in hierarchy (i.e. view controller's view), this line should be enough:

title.center = vc.view.center

Otherwise, if you ever want to center your view/label/button/whatever inside any view controller view's subview — the next solution is universal:

title.center = CGPoint(x: parentView.bounds.size.width / 2, y: parentView.bounds.size.height / 2)

If you want to center only horizontally or vertically — modify y or x parameter of CGPoint(x:y:) function correspondingly:

// Center horizontally but with vertical offset of 20 points
title.center = CGPoint(x: parentView.bounds.size.width / 2, y: 20 - title.bounds.size.height / 2)

How do I center text in Swift?

2 Answers2