Can't change the text size in programmatically created UILabel - ios

Question

I cannot change the size of the text in a programmatically created UILabel.
Here's a screen grab:
Here's the class definition:
class myView: UIView {
let theLabel = UILabel()
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.theLabel.text = "Text"
self.theLabel.backgroundColor = UIColor.lightGray
self.backgroundColor = UIColor.blue
self.theLabel.adjustsFontSizeToFitWidth = true
self.theLabel.textAlignment = .center
self.theLabel.numberOfLines = 1
self.theLabel.minimumScaleFactor = 0.1
self.theLabel.font = UIFont( name: "System", size:160)
self.theLabel.translatesAutoresizingMaskIntoConstraints = false
self.addSubview(self.theLabel)
let selfAspectConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 1.0, constant: 0)
let labelWidthConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)
let heightConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self.theLabel, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)
let xConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)
let yConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0)
self.addConstraints([selfAspectConstraint,labelWidthConstraint, heightConstraint,xConstraint,yConstraint])
}
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
}
I've tried changing the font size. I've set adjustsFontSizeToFitWidth to true and set minimumScaleFactor. The text size is always the same. I expect it to fill the label area, the grey box.
How do I get this to work?

Answer 1

try adding this line after you set the font:
self.theLabel.font = theLabel.font.withSize(45)

Answer 2

Your code works as expected, without any change.
CustomView1NoXIB.swift
import UIKit
class CustomView1NoXIB : UIView {
let theLabel = UILabel()
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initSubviews()
}
func initSubviews() {
self.theLabel.text = "Hello"
// self.theLabel.text = "Hello World Big Text Becomes Small"
self.theLabel.backgroundColor = UIColor.lightGray
self.backgroundColor = UIColor.blue
self.theLabel.adjustsFontSizeToFitWidth = true
self.theLabel.textAlignment = .center
self.theLabel.numberOfLines = 1
self.theLabel.minimumScaleFactor = 0.1
self.theLabel.font = UIFont( name: "System", size:160)
self.theLabel.translatesAutoresizingMaskIntoConstraints = false
self.addSubview(self.theLabel)
let selfAspectConstraint = NSLayoutConstraint(item: self, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 1.0, constant: 0)
let labelWidthConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)
let heightConstraint = NSLayoutConstraint(item: self.theLabel, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: self.theLabel, attribute: NSLayoutAttribute.width, multiplier: 0.5, constant: 0)
let xConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1, constant: 0)
let yConstraint = NSLayoutConstraint(item: self.theLabel, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1, constant: 0)
self.addConstraints([selfAspectConstraint,labelWidthConstraint, heightConstraint,xConstraint,yConstraint])
}
}
CustomView1ViewController.swift
import UIKit
class CustomView1ViewController : UIViewController {
#IBOutlet weak var customView1: CustomView1!
#IBOutlet weak var customView1NoXIB: CustomView1NoXIB!
override func viewDidLoad() {
super.viewDidLoad()
}
}
Thanks,
Sriram