How can I make a button have a rounded border in Swift?

In Swift, you can use the layer property of a UIButton to set the corner radius of its border. You can use the layer (CALayer) property to apply the border width and color to the button. Also, the same property provides access to the cornerRadius property to make the button rounded.

We will use the following steps to make a button rounded with a border

Step 1 ? In this step, create a button object with basic customization.

Step 2 ? In this step, add a border and corner radius to the button.

Step 3 ? In this step, make the button rounded.

Example

In this step, you will create a button and do some basic customization. Here is the code.

import UIKit
class TestController: UIViewController {   
   private let loginButton = UIButton()    
   override func viewDidLoad() {
      super.viewDidLoad()
      initialSetup()
   }    
   private func initialSetup() {        
      // basic setup
      view.backgroundColor = .white
      navigationItem.title = "UIButton"
        
      // log in button customization
      loginButton.setTitle("Button with rounded border", for: .normal)
      loginButton.setTitleColor(.red, for: .normal)
        
      // adding the constraints to the login button
      view.addSubview(loginButton)
      loginButton.translatesAutoresizingMaskIntoConstraints = false
      loginButton.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
      loginButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
      loginButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
      loginButton.widthAnchor.constraint(equalToConstant: 280).isActive = true
   }
}

Output

Add a border and corner radius

In this step, we will apply a corner radius and border width to the button. Here is an example ?

Example

private func initialSetup() {   
   // basic setup
    
   // log in button customization
    
   // adding the constraints to the login button
    
   addButtonBorder()
}
private func addButtonBorder() {
   loginButton.layer.borderColor = UIColor.red.cgColor
   loginButton.layer.borderWidth = 1.5
   loginButton.layer.cornerRadius = 10.0
   loginButton.layer.masksToBounds = true
}

Output

Make the button rounded with the border

In this step, we will make the button rounded with the border. Here is an example ?

Example

private func initialSetup() {
   // basic setup
   // log in button customization
   // adding the constraints to the login button
   makeButtonRounded()
}
private func makeButtonRounded() {
   loginButton.layer.borderColor = UIColor.red.cgColor
   loginButton.layer.borderWidth = 1.5
   loginButton.layer.cornerRadius = 25.0 // height / 2
   loginButton.layer.masksToBounds = true
}

Output

Conclusion

In conclusion, to make a button have a rounded border in Swift, you can use the layer property of a UIButton to set the corner radius, border width, and border color.