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

Question

I'm building an app using swift in the latest version of Xcode 6, and would like to know how I can modify my button so that it can have a rounded border that I could adjust myself if needed. Once that's done, how can I change the color of the border itself without adding a background to it? In other words I want a slightly rounded button with no background, only a 1pt border of a certain color.

Answer 1

Use button.layer.cornerRadius, button.layer.borderColor and button.layer.borderWidth. Note that borderColor requires a CGColor, so you could say (Swift 3/4):

button.backgroundColor = .clear
button.layer.cornerRadius = 5
button.layer.borderWidth = 1
button.layer.borderColor = UIColor.black.cgColor

Answer 2

To do this job in storyboard (Interface Builder Inspector)

With help of IBDesignable, we can add more options to Interface Builder Inspector for UIButton and tweak them on storyboard. First, add the following code to your project.

@IBDesignable extension UIButton {

    @IBInspectable var borderWidth: CGFloat {
        set {
            layer.borderWidth = newValue
        }
        get {
            return layer.borderWidth
        }
    }

    @IBInspectable var cornerRadius: CGFloat {
        set {
            layer.cornerRadius = newValue
        }
        get {
            return layer.cornerRadius
        }
    }

    @IBInspectable var borderColor: UIColor? {
        set {
            guard let uiColor = newValue else { return }
            layer.borderColor = uiColor.cgColor
        }
        get {
            guard let color = layer.borderColor else { return nil }
            return UIColor(cgColor: color)
        }
    }
}

Then simply set the attributes for buttons on storyboard.

Answer 3

I have created a simple UIButton sublcass that uses the tintColor for its text and border colours and when highlighted changes its background to the tintColor.

class BorderedButton: UIButton {

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    layer.borderWidth = 1.0
    layer.borderColor = tintColor.CGColor
    layer.cornerRadius = 5.0
    clipsToBounds = true
    contentEdgeInsets = UIEdgeInsets(top: 8, left: 8, bottom: 8, right: 8)
    setTitleColor(tintColor, forState: .Normal)
    setTitleColor(UIColor.whiteColor(), forState: .Highlighted)
    setBackgroundImage(UIImage(color: tintColor), forState: .Highlighted)
}
}

This makes use of a UIImage extension that creates an image from a colour, I found that code here: https://stackoverflow.com/a/33675160

It works best when set to type Custom in interface builder as the default System type slightly modifies the colours when the button is highlighted.

Answer 4

This class is based from all the comments and suggestions in answers, and also can be designable directly from xcode. Copy to your project and insert any UIButton and change to use custom class, now just select border or background color from xcode for normal and/or highlighted states.

//
//  RoundedButton.swift
//

import UIKit

@IBDesignable
class RoundedButton:UIButton {

    @IBInspectable var borderWidth: CGFloat = 0 {
        didSet {
            layer.borderWidth = borderWidth
        }
    }
    //Normal state bg and border
    @IBInspectable var normalBorderColor: UIColor? {
        didSet {
            layer.borderColor = normalBorderColor?.CGColor
        }
    }

    @IBInspectable var normalBackgroundColor: UIColor? {
        didSet {
            setBgColorForState(normalBackgroundColor, forState: .Normal)
        }
    }


    //Highlighted state bg and border
    @IBInspectable var highlightedBorderColor: UIColor?

    @IBInspectable var highlightedBackgroundColor: UIColor? {
        didSet {
            setBgColorForState(highlightedBackgroundColor, forState: .Highlighted)
        }
    }


    private func setBgColorForState(color: UIColor?, forState: UIControlState){
        if color != nil {
            setBackgroundImage(UIImage.imageWithColor(color!), forState: forState)

        } else {
            setBackgroundImage(nil, forState: forState)
        }
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        layer.cornerRadius = layer.frame.height / 2
        clipsToBounds = true

        if borderWidth > 0 {
            if state == .Normal && !CGColorEqualToColor(layer.borderColor, normalBorderColor?.CGColor) {
                layer.borderColor = normalBorderColor?.CGColor
            } else if state == .Highlighted && highlightedBorderColor != nil{
                layer.borderColor = highlightedBorderColor!.CGColor
            }
        }
    }

}

//Extension Required by RoundedButton to create UIImage from UIColor
extension UIImage {
    class func imageWithColor(color: UIColor) -> UIImage {
        let rect: CGRect = CGRectMake(0, 0, 1, 1)
        UIGraphicsBeginImageContextWithOptions(CGSizeMake(1, 1), false, 1.0)
        color.setFill()
        UIRectFill(rect)
        let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

Answer 5

@IBOutlet weak var yourButton: UIButton! {
    didSet{
        yourButton.backgroundColor = .clear
        yourButton.layer.cornerRadius = 10
        yourButton.layer.borderWidth = 2
        yourButton.layer.borderColor = UIColor.white.cgColor
    }
}

Answer 6

Based on @returntrue answer I managed to implement it in Interface Builder.

To get round corners button using Interface Builder add a Key Path = "layer.cornerRadius" with Type = "Number" and Value = "10" (or other value as required) in the "User Defined RunTime Attribute" of the Identity Inspector of the button.

Answer 7

You can use this subclass of UIButton to customize UIButton as per your needs.

visit this github repo for reference

class RoundedRectButton: UIButton {

    var selectedState: Bool = false

    override func awakeFromNib() {
        super.awakeFromNib()
        layer.borderWidth = 2 / UIScreen.main.nativeScale
        layer.borderColor = UIColor.white.cgColor
        contentEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
    }


    override func layoutSubviews(){
        super.layoutSubviews()
        layer.cornerRadius = frame.height / 2
        backgroundColor = selectedState ? UIColor.white : UIColor.clear
        self.titleLabel?.textColor = selectedState ? UIColor.green : UIColor.white
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        selectedState = !selectedState
        self.layoutSubviews()
    }
}

Answer 8

I think the easiest and the cleanest way, is to use protocol to avoid inherit and code repetition. You can change this properties directly from storyboard

protocol Traceable {
    var cornerRadius: CGFloat { get set }
    var borderColor: UIColor? { get set }
    var borderWidth: CGFloat { get set }
}

extension UIView: Traceable {

    @IBInspectable var cornerRadius: CGFloat {
        get { return layer.cornerRadius }
        set {
            layer.masksToBounds = true
            layer.cornerRadius = newValue
        }
    }

    @IBInspectable var borderColor: UIColor? {
        get {
            guard let cgColor = layer.borderColor else { return nil }
            return  UIColor(cgColor: cgColor)
        }
        set { layer.borderColor = newValue?.cgColor }
    }

    @IBInspectable var borderWidth: CGFloat {
        get { return layer.borderWidth }
        set { layer.borderWidth = newValue }
    }
}

Update

In this link you can find an example with the utility of Traceable protocol

Answer 9

Solution for UIBuilder lovers:

1. check the 'Clip to Bounds' checkbox in the UIButton's "Attribution Inspector" window. [see figure 1 below]

2. Click on the "Identity Inspector", and hit the '+' symbol to enter a new Key Path: layer.cornerRadius, Number, 8 (or 16 etc...). [see figure 2 below]

Figure 1: Clip to Bounds check box

Figure 2: Key Path code...

Figure 3: the resultant image-button

Answer 10

It is globally method for rounded border of UIButton

class func setRoundedBorderButton(btn:UIButton)
{
   btn.layer.cornerRadius = btn.frame.size.height/2
   btn.layer.borderWidth = 0.5
   btn.layer.borderColor = UIColor.darkGray.cgColor
}

Answer 11

as aside tip make sure your button is not subclass of any custom class in story board , in such a case your code best place should be in custom class it self cause code works only out of the custom class if your button is subclass of the default UIButton class and outlet of it , hope this may help anyone wonders why corner radios doesn't apply on my button from code .

Answer 12

@IBOutlet weak var button: UIButton!

...

I think for radius just enough this parameter:

button.layer.cornerRadius = 5

Answer 13

TRY THIS Button Border With Rounded Corners

anyButton.backgroundColor = .clear

anyButton.layer.cornerRadius = anyButton.frame.height / 2

anyButton.layer.borderWidth = 1

anyButton.layer.borderColor = UIColor.black.cgColor

Answer 14

import UIKit

@IBDesignable
class RoundedButton: UIButton {
    
    @IBInspectable var cornerRadius: CGFloat = 8
    @IBInspectable var borderColor: UIColor? = .lightGray
    
    override func draw(_ rect: CGRect) {
        layer.cornerRadius = cornerRadius
        layer.masksToBounds = true
        layer.borderWidth = 1
        layer.borderColor = borderColor?.cgColor
        
    }
    
    
}

Answer 15

You can subclass UIButton and add @IBInspectable variables to it so you can configure the custom button parameters via the StoryBoard "Attribute Inspector". Below I write down that code.

@IBDesignable
class BHButton: UIButton {

    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */

    @IBInspectable lazy var isRoundRectButton : Bool = false

    @IBInspectable public var cornerRadius : CGFloat = 0.0 {
        didSet{
            setUpView()
        }
    }

    @IBInspectable public var borderColor : UIColor = UIColor.clear {
        didSet {
            self.layer.borderColor = borderColor.cgColor
        }
    }

    @IBInspectable public var borderWidth : CGFloat = 0.0 {
        didSet {
            self.layer.borderWidth = borderWidth
        }
    }

    //  MARK:   Awake From Nib

    override func awakeFromNib() {
        super.awakeFromNib()
        setUpView()
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        setUpView()
    }

    func setUpView() {
        if isRoundRectButton {
            self.layer.cornerRadius = self.bounds.height/2;
            self.clipsToBounds = true
        }
        else{
            self.layer.cornerRadius = self.cornerRadius;
            self.clipsToBounds = true
        }
    }

}

Answer 16

I think this is the simple form

Button1.layer.cornerRadius = 10(Half of the length and width)
Button1.layer.borderWidth = 2