Swift position and constraints programmatically - ios

Question

I have the following view:
I have to place a UIButton or a UILabel below Account balance depending if this movement is rejected or not (just check a variable).
I've created programmatically the button & label depending on that, but I don't know how to add it to that specific place and add constraints.
func checkRejected () {
if !movement.rejected {
let xposition = amountLabel.frame.origin.x
let yposition = balanceLabel.frame.origin.y + 300
let button = UIButton(frame: CGRect(x: xposition, y: yposition, width: 100, height: 50))
button.setTitle("Reject", for: .normal)
button.setTitleColor(UIColor.blue, for: .normal)
button.addTarget(self, action: #selector(rejectAction), for: .touchUpInside)
self.view.addSubview(button)
}
else {
let xposition = amountLabel.frame.origin.x
let yposition = balanceLabel.frame.origin.y + 300
let label = UILabel(frame: CGRect(x: xposition, y: yposition, width: 100, height: 50))
label.text = "Rejected"
label.textColor = UIColor.red
self.view.addSubview(label)
}
}
How I could do that?

Answer 1

You can try
self.view.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
button.topAnchor.constraint(equalTo: self.balanceLabel.bottomAnchor,constant:30),
button.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
])
Same for the label
Note: Since the button and the label have an intrinsic content size , then we don't have to set width && height