Swift Cannot Round the Corners of my UIButton - ios

Question

I've looked at almost every stackoverflow solution and for some odd reason my button will not round the corners. Can someone check and see what im doing wrong?
let goToMapsButton = UIButton(type: .custom)
scrollView.addSubview(goToMapsButton)
_ = goToMapsButton.anchor(map.bottomAnchor, left: nil, bottom: seperator.topAnchor, right: self.view.rightAnchor, topConstant: 16, leftConstant: 0, bottomConstant: 16, rightConstant: 16, widthConstant: 50, heightConstant: 50)
goToMapsButton.backgroundColor = .green
goToMapsButton.layer.cornerRadius = 0.5 * goToMapsButton.bounds.size.width
goToMapsButton.clipsToBounds = true
goToMapsButton.layer.masksToBounds = true
Btw, Im doing this all in the viewDidLoad section of the view controller, if that info makes a difference.
Here is the full viewDidLoadClass for reference:` override func viewDidLoad() {
super.viewDidLoad()
let map = MKMapView()
let view1 = UIView()
view1.backgroundColor = .red
let storeAddress = UILabel()
storeAddress.text = "318 Atwood Avenue"
storeAddress.font = UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.medium)
let storeCity = UILabel()
storeCity.text = "Rainy River"
storeCity.font = UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.medium)
let seperator = UIView()
seperator.backgroundColor = .lightGray
let goToMapsButton = UIButton(type: .custom)
scrollView.addSubview(map)
scrollView.addSubview(view1)
scrollView.addSubview(storeAddress)
scrollView.addSubview(storeCity)
scrollView.addSubview(goToMapsButton)
scrollView.addSubview(seperator)
map.anchorToTop(scrollView.topAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor)
map.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.6).isActive = true
_ = storeAddress.anchor(map.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: nil, topConstant: 16, leftConstant: 16, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
_ = storeCity.anchor(storeAddress.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: nil, topConstant: 8, leftConstant: 16, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
_ = goToMapsButton.anchor(map.bottomAnchor, left: nil, bottom: nil, right: self.view.rightAnchor, topConstant: 16, leftConstant: 0, bottomConstant: 16, rightConstant: 16, widthConstant: 50, heightConstant: 50)
goToMapsButton.backgroundColor = .green
print(goToMapsButton.frame.width)
goToMapsButton.layer.cornerRadius = 0.25 * goToMapsButton.frame.width
goToMapsButton.clipsToBounds = true
goToMapsButton.layer.masksToBounds = true
_ = seperator.anchor(storeCity.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor, topConstant: 8, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 1)
view1.anchorToTop(map.bottomAnchor, left: self.view.leftAnchor, bottom: scrollView.bottomAnchor, right: self.view.rightAnchor)
view1.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.8).isActive = true
}`

Answer 1

Move this code in viewWillLayoutSubviews:
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
goToMapsButton.layer.cornerRadius = 0.25 * goToMapsButton.frame.width
}
Or create your custom class for button with rounded corners:
class RoundedButton: UIButton {
#IBInspectable var cornerRadius: CGFloat = 0
override func layoutSubviews() {
super.layoutSubviews()
clipsToBounds = true
layer.cornerRadius = cornerRadius
}
}

Answer 2

I face the same issue today, I'm using Anchor too. Well it looks like a one line stuff to me, never think it would takes that much of code.
The difficult is that we cannot get the frame.height or width in UIButton property closure because autolayout has not calculate the size at that time. I do a test to apply the purely round corner in viewDidLayoutSubviews.
And this is what it is looks like, although the declaration is separated for those UIButtons. I really don't like this way, I want to put all button declaration code in the same place, like a closure. However I don't find any other way to do it in internet.
let b1 = UIButton()
let b2 = UIButton()
let b3 = UIButton()
let b4 = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
configureLayout()
}
private func configureLayout() {
// disable large title
navigationItem.largeTitleDisplayMode = .never
let topLabel = UILabel()
topLabel.text = "Import your music"
topLabel.font = .systemFont(ofSize: 30, weight: .heavy)
topLabel.numberOfLines = 0
topLabel.textColor = .black
topLabel.textAlignment = .center
let stack = UIStackView()
stack.translatesAutoresizingMaskIntoConstraints = false
stack.axis = .vertical
stack.spacing = 40
stack.addArrangedSubview(topLabel)
b1.setTitle("Local drive", for: .normal)
b2.setTitle("Google", for: .normal)
b3.setTitle("OneNote", for: .normal)
b4.setTitle("DropBox", for: .normal)
b1.backgroundColor = .myBlue
b2.backgroundColor = .myGreen
b3.backgroundColor = .systemPink
b4.backgroundColor = .myPuple
b1.tag = 1
b2.tag = 2
b3.tag = 3
b4.tag = 4
[b1, b2, b3, b4].forEach { b in
b.titleLabel?.font = .systemFont(ofSize: 20, weight: .bold)
b.setTitleColor(.white, for: .normal)
b.setTitleColor(.gray, for: .highlighted)
stack.addArrangedSubview(b)
b.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)
}
view.addSubview(stack)
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
stack.centerXAnchor.constraint(equalTo: g.centerXAnchor),
stack.centerYAnchor.constraint(equalTo: g.centerYAnchor),
stack.widthAnchor.constraint(equalTo: g.widthAnchor, multiplier: 0.75)
])
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
[b1, b2, b3, b4].forEach { b in
b.layer.cornerRadius = b1.frame.height / 2
b.layer.cornerCurve = .continuous
}
}

Answer 3

Give your button a frame. like that
goToMapsButton.frame = CGRect(x: xposition, y:yposition, width: widthyouwant, height: heightyouwant)
as currently your size of button is zero 0*0.5 = zero thats why its not applying any radius.
give it frame and it will work...

Answer 4

UIButton might have a background UIImage with rounded corners. It allowes you to set a background UIImage for each UIControlState of your UIButton.
open class UIButton : UIControl, NSCoding {
open func setBackgroundImage(_ image: UIImage?, for state: UIControlState)
}
If your UIButton's size is determined at runtime and the radius is fixed - you can use a resizable image:
open class UIImage : NSObject, NSSecureCoding {
open func resizableImage(withCapInsets capInsets: UIEdgeInsets) -> UIImage
}
On the gif below I use UIImage with size = CGSize(width: 7, height: 7), corner radius = 3 and cap insets = UIEdgeInsets(top: 3, left: 3, bottom: 3, right: 3)