Button Border with Transparent Background in Swift

Button Border with Transparent Background in Swift

Setting the backgroundColor to clearColor makes the button transparent.
Try the code below for example. You can configure and vary the borderAlpha,cornerRadius and colours as your want.

let borderAlpha : CGFloat = 0.7
let cornerRadius : CGFloat = 5.0

button.frame = CGRectMake(100, 100, 200, 40)
button.setTitle("Get Started", forState: UIControlState.Normal)
button.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
button.backgroundColor = UIColor.clearColor()
button.layer.borderWidth = 1.0
button.layer.borderColor = UIColor(white: 1.0, alpha: borderAlpha).CGColor
button.layer.cornerRadius = cornerRadius

Semi-transparent border on button

Use the button's layer's properties:

yourButton.layer.borderWidth = 3.0f;
yourButton.layer.borderColor = [UIColor colorWithRed:178/255.0 green:170/255.0 blue:156/255.0 alpha:0.4].CGColor;

(Change the values so it looks good, alpha makes it semi-transparent)

Also, you'll need this if you don't have the circle yet:

yourButton.layer.cornerRadius = yourButton.frame.size.width/2;

EDIT: As @holex suggested, a better way to calculate the cornerRadius is:

CGFloat radius = MIN(yourButton.frame.size.width, yourButton.frame.size.height) / 2.0
yourButton.layer.cornerRadius = radius;

Transparent background button with 2 sided corner radius in Swift

You can edit roundCorners function like below;

extension UIButton {
    
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat, borderColor: UIColor, borderWidth: CGFloat) {
        let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        layer.mask = mask
        
        let borderLayer = CAShapeLayer()
        borderLayer.path = path.cgPath
        borderLayer.lineWidth = borderWidth
        borderLayer.strokeColor = borderColor.cgColor
        borderLayer.fillColor = UIColor.clear.cgColor
        borderLayer.frame = bounds
        layer.addSublayer(borderLayer)
    }
}

and use it like:

let button = UIButton(frame: CGRect(x: 50, y: 50, width: 100, height: 40))
button.setTitle("Today", for: .normal)
button.roundCorners([.topLeft, .bottomLeft], radius: 25, borderColor: .white, borderWidth: 10)

Swift how change the background color and button border

you forgot to set UIButton Border

button.layer.borderWidth = 0.8

UIButton Semi-Transparent Border

Set the color of a sublayer to the color you want the button to be (don't set the background color of the button itself), and inset its rect relative to the button's rect,

- (void) awakeFromNib {
    self.layer.cornerRadius = 6.0f;
    self.layer.borderWidth = 4.0f;
    self.layer.borderColor = [[UIColor colorWithWhite:1.0f alpha:0.5f] CGColor];
    CALayer *sub = [CALayer new];
    sub.frame = CGRectInset(self.bounds, 4, 4);
    sub.backgroundColor = [UIColor redColor].CGColor;
    [self.layer addSublayer:sub];
}

Another way to do it, which will work better if you want the background color to be rounded too, is use a background color for both the self.layer and the sublayer. In this case theres on need to use a border at all.

- (void) awakeFromNib {
    self.layer.cornerRadius = 6.0f;
    self.tintColor = [UIColor whiteColor]; // make white text
    self.layer.backgroundColor = [[UIColor colorWithWhite:1.0f alpha:0.4] CGColor];
    CALayer *sub = [CALayer new];
    sub.cornerRadius = 4.0f;
    sub.frame = CGRectInset(self.bounds, 4, 4);
    sub.backgroundColor = [UIColor blueColor].CGColor;
    [self.layer addSublayer:sub];
}

SwiftUI - Button with transparent background

Thanks to Asperi to point me into the right direction.

I just had to add

.buttonStyle(PlainButtonStyle())

to the group.

SwiftUI: Button with image got gray border on real iPhone but works fine on simulation mode

in MainList get rid of:

            .background(.white)

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

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

Why does a selected image overflow the button border in swift?

Set buttons clip to bounds true

button.clipsToBounds = true

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