Add Top border to selected TabBar

Question

How to add border to the TOP of selected TabBar. Below method I have used to add it at bottom but I want

extension UIImage {
    func createSelectionIndicator(color: UIColor, size: CGSize, lineWidth: CGFloat) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        color.setFill()
        UIRectFill(CGRect(x: 0, y: size.height - lineWidth, width: size.width, height: lineWidth))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
    }
}

tabBar.selectionIndicatorImage = UIImage().createSelectionIndicator(color: BLUE, size: CGSize(width: tabBar.frame.width/CGFloat(tabBar.items!.count), height:  tabBar.frame.height), lineWidth: 2.0)

Answer 1

You can use the function to create borders on any side -

enum Side: String {
    case top, left, right, bottom
}

extension UIImage {
    func createSelectionIndicator(color: UIColor, size: CGSize, lineThickness: CGFloat, side: Side) -> UIImage {
        var xPosition = 0.0
        var yPosition = 0.0
        var imgWidth = 2.0
        var imgHeight = 2.0
        switch side {
            case .top:
                xPosition = 0.0
                yPosition = 0.0
                imgWidth = size.width
                imgHeight = lineThickness
            case .bottom:
                xPosition = 0.0
                yPosition = size.height - lineThickness
                imgWidth = size.width
                imgHeight = lineThickness
            case .left:
                xPosition = 0.0
                yPosition = 0.0
                imgWidth = lineThickness
                imgHeight = size.height
            case .right:
                xPosition = size.width - lineThickness
                yPosition = 0.0
                imgWidth = lineThickness
                imgHeight = size.height
        }
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        color.setFill()
        UIRectFill(CGRect(x: xPosition, y: yPosition, width: imgWidth, height: imgHeight))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
    }
}

tabBar.selectionIndicatorImage = UIImage().createSelectionIndicator(color: BLUE, size: CGSize(width: tabBar.frame.width/CGFloat(tabBar.items!.count), height:  tabBar.frame.height), lineThickness: 2.0, side: .top)

Let me know if this was useful or you need any other help. Happy Coding :)