Add label in center of imageView - swift

Question

I have the two images like in the picture at the end of the question (the image of a list and a red dot). I want to add a label in the center of the red dot. This is my code that doesn't work:
image = UIImageView(image: UIImage(named: "pallino"))
image.frame = CGRect(x: 55, y: self.view.frame.height-60, width: 22, height: 22)
self.view.addSubview(image)
image.layer.cornerRadius = image.frame.width/2
label = UILabel(frame: CGRect(x: self.image.center.x, y: self.image.center.y, width: image.frame.size.width, height: image.frame.size.height))
label.text = "4"
label.font = UIFont(name:"HelveticaNeue-Bold", size: 15.0)
label.translatesAutoresizingMaskIntoConstraints = false
label.textColor = UIColor.black
image.addSubview(label)
Can someone tell me were am I wrong?

Answer 1

Problem in this line:
label = UILabel(frame: CGRect(x: self.image.center.x, y: self.image.center.y, width: image.frame.size.width, height: image.frame.size.height))
self.image.center.x - The center point is specified in points in the coordinate system of its superview, it is mean that self.image.center is not center of image
You need frame for label, something like this:
let imageSize = 22
let frame = CGRect(x: 0, y: 0, width: imageSize, height: imageSize)
let label = UILabel(frame: frame)
label.aligment = .center

Answer 2

You can set constraint in your label(centered Horizontally and Vertically). Try with the following code.
let label = UILabel()
label.text = "4"
label.font = UIFont(name:"HelveticaNeue-Bold", size: 15.0)
label.translatesAutoresizingMaskIntoConstraints = false
label.textColor = UIColor.black
image.addSubview(label)
label.centerXAnchor.constraint(equalTo: self.image.centerXAnchor).isActive = true
label.centerYAnchor.constraint(equalTo: self.image.centerYAnchor).isActive = true

Answer 3

To center the label in UIImageView you can refer to this example which is tested and working solution.
extension UIImageView {
/// Create label programmatically
/// - Returns: UILabel
private func ageSensitiveLabel() -> UILabel {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height))
label.text = "Content"
label.font = .systemFont(ofSize: 5.0)
label.textAlignment = .center
label.numberOfLines = 0
label.minimumScaleFactor = 0.5
label.adjustsFontSizeToFitWidth = true
label.baselineAdjustment = .alignCenters
label.textColor = .white
return label
}
/// Add label as subview to UIImageView
func addAgeSensitiveLabel() {
self.subviews.forEach { view in
DispatchQueue.main.async {
view.removeFromSuperview()
}
}
self.addSubview(ageSensitiveLabel())
}
}
Use it with UIImageView
imageView.addAgeSensitiveLabel()