How to add a border just on the top side of a UIVi

Question

My question is on the title.

I don't know how to add a border in a specific side, top or bottom, any side... layer.border draws the border for the whole view...

Answer 1

In Swift 4 and 3

let borderThickness = 2
let topBorder = UIView()
topBorder.backgroundColor = UIColor.red
topBorder.frame = CGRect(x: 0, y: 0, width: 
                  Int(yourViewFromOutlet.frame.size.width), height: 
                  borderThickness)
yourViewFromOutlet.addSubview(topBorder)

Answer 2

Building off of NSBum's answer, I took a similar approach and created this simple UIView subclass so that it works in Interface Builder and works with constraints: github link
By using CGContextFillRect instead of CGContextStrokePath, I was able to predictably keep the lines completely solid and within the bounds of the view.

Here's my blog post about it: http://natrosoft.com/?p=55

-- Basically just drop in a UIView in Interface Builder and change its class type to NAUIViewWithBorders.
-- Then in your VC's viewDidLoad do something like:

/* For a top border only ———————————————- */
self.myBorderView.borderColorTop = [UIColor redColor];
self.myBorderView..borderWidthsAll = 1.0f;

/* For borders with different colors and widths ————————— */
self.myBorderView.borderWidths = UIEdgeInsetsMake(2.0, 4.0, 6.0, 8.0);
self.myBorderView.borderColorTop = [UIColor blueColor];
self.myBorderView.borderColorRight = [UIColor redColor];
self.myBorderView.borderColorBottom = [UIColor greenColor];
self.myBorderView.borderColorLeft = [UIColor darkGrayColor];

Here's a direct link to the .m file so you can see the implementation. There is a demo project as well. Hope this helps someone :)

Answer 3

Just posting here to help someone looking for adding borders. I have made a few changes in the accepted answer here swift label only border left. Changed width in case UIRectEdge.Top from CGRectGetHeight(self.frame) to CGRectGetWidth(self.frame) and in case UIRectEdge.Bottom from UIScreen.mainScreen().bounds.width to CGRectGetWidth(self.frame) to get borders correctly. Using Swift 2.

Finally the extension is :

extension CALayer {

func addBorder(edge: UIRectEdge, color: UIColor, thickness: CGFloat) {

    let border = CALayer();

    switch edge {
    case UIRectEdge.Top:
        border.frame = CGRectMake(0, 0, CGRectGetWidth(self.frame), thickness); 
        break
    case UIRectEdge.Bottom:
        border.frame = CGRectMake(0, CGRectGetHeight(self.frame) - thickness, CGRectGetWidth(self.frame), thickness)
        break
    case UIRectEdge.Left:
        border.frame = CGRectMake(0, 0, thickness, CGRectGetHeight(self.frame))
        break
    case UIRectEdge.Right:
        border.frame = CGRectMake(CGRectGetWidth(self.frame) - thickness, 0, thickness, CGRectGetHeight(self.frame))
        break
    default:
        break
    }

    border.backgroundColor = color.CGColor;

    self.addSublayer(border)
}

}

Answer 4

Here's a Swift 4 version of Pauls's answer

func addTopBorder(color: UIColor, thickness: CGFloat) {
    let border = UIView()
    border.backgroundColor = color
    border.autoresizingMask = [.flexibleWidth, .flexibleBottomMargin]
    border.frame = CGRect(x: 0, y: 0, width: frame.size.width, height: thickness)
    addSubview(border)
}

func addBottomBorder(color: UIColor, thickness: CGFloat) {
    let border = UIView()
    border.backgroundColor = color
    border.autoresizingMask = [.flexibleWidth, .flexibleTopMargin]
    border.frame = CGRect(x: 0, y: frame.size.height - thickness, width: frame.size.width, height: thickness)
    addSubview(border)
}

func addLeftBorder(color: UIColor, thickness: CGFloat) {
    let border = UIView()
    border.backgroundColor = color
    border.autoresizingMask = [.flexibleHeight, .flexibleRightMargin]
    border.frame = CGRect(x: 0, y: 0, width: thickness, height: frame.size.height)
    addSubview(border)
}

func addRightBorder(color: UIColor, thickness: CGFloat) {
    let border = UIView()
    border.backgroundColor = color
    border.autoresizingMask = [.flexibleHeight, .flexibleLeftMargin]
    border.frame = CGRect(x: frame.size.width - thickness, y: 0, width: thickness, height: frame.size.height)
    addSubview(border)
}

Answer 5

Swift version:

var myView = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
myView.backgroundColor = UIColor.yellowColor() 

var border = CALayer()
border.backgroundColor = UIColor.lightGrayColor()
border.frame = CGRect(x: 0, y: 0, width: myView.frame.width, height: 0.5)

myView.layer.addSublayer(border)

Edit: For updated versions check my repo here: https://github.com/goktugyil/EZSwiftExtensions/blob/master/Sources/UIViewExtensions.swift

Look at the addBorder parts

Answer 6

Swift 3.0

Swift 4.1

extension CALayer {

    func addBorder(edge: UIRectEdge, color: UIColor, thickness: CGFloat) {

        let border = CALayer();

        switch edge {
        case UIRectEdge.top:
            border.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: thickness)
            break
        case UIRectEdge.bottom:
            border.frame = CGRect(x:0, y:self.frame.height - thickness, width:self.frame.width, height:thickness)
            break
        case UIRectEdge.left:
            border.frame = CGRect(x:0, y:0, width: thickness, height: self.frame.height)
            break
        case UIRectEdge.right:
            border.frame = CGRect(x:self.frame.width - thickness, y: 0, width: thickness, height:self.frame.height)
            break
        default:
            break
        }

        border.backgroundColor = color.cgColor;

        self.addSublayer(border)
    }

}