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How to create UILabel programmatically by Swift language?

Posted by: admin November 30, 2017 Leave a comment

Questions:

How do I create a UILabel programmatically using Swift language in Xcode 6?

I have started with a new “Single View Application” in Xcode 6 and select the Swift language for this project. I have my files AppDelegate.swift and ViewController.swift and I’m not sure what to do from here.

Answers:
override func viewDidLoad()
{
  super.viewDidLoad()
  var label = UILabel(frame: CGRectMake(0, 0, 200, 21))
  label.center = CGPointMake(160, 284)
  label.textAlignment = NSTextAlignment.Center
  label.text = "I'am a test label"
  self.view.addSubview(label)
}  

Swift 3.0 Update:

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = "I'am a test label"
self.view.addSubview(label)

Questions:
Answers:

Here is the correct code for Swift 3, with comments for instructional purposes:

override func viewDidLoad()
{
    super.viewDidLoad()

    // CGRectMake has been deprecated - and should be let, not var
    let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))

    // you will probably want to set the font (remember to use Dynamic Type!)
    label.font = UIFont.preferredFont(forTextStyle: .footnote)

    // and set the text color too - remember good contrast
    label.textColor = .black

    // may not be necessary (e.g., if the width & height match the superview)
    // if you do need to center, CGPointMake has been deprecated, so use this
    label.center = CGPoint(x: 160, y: 284)

    // this changed in Swift 3 (much better, no?)
    label.textAlignment = .center

    label.text = "I am a test label"

    self.view.addSubview(label)
}

Questions:
Answers:

Just to add onto the already great answers, you might want to add multiple labels in your project so doing all of this (setting size, style etc) will be a pain. To solve this, you can create a separate UILabel class.

  import UIKit

  class MyLabel: UILabel {

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initializeLabel()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        initializeLabel()
    }

    func initializeLabel() {

        self.textAlignment = .left
        self.font = UIFont(name: "Halvetica", size: 17)
        self.textColor = UIColor.white

    }

}

To use it, do the following

import UIKit

class ViewController: UIViewController {

     var myLabel: MyLabel()

     override func viewDidLoad() {
          super.viewDidLoad()

          myLabel = MyLabel(frame: CGRect(x: self.view.frame.size.width / 2, y: self.view.frame.size.height / 2, width: 100, height: 20))
          self.view.addSubView(myLabel)
     }


}

Questions:
Answers:

You can create label using below code.

var yourLabel: UILabel = UILabel()
yourLabel.frame = CGRectMake(50, 150, 200, 21)
yourLabel.backgroundColor = UIColor.orangeColor()
yourLabel.textColor = UIColor.blackColor()
yourLabel.textAlignment = NSTextAlignment.Center
yourLabel.text = "test label"
self.view.addSubview(yourLabel)