Add bottom line to view in SwiftUI / Swift / Objective-C / Xamarin

Question

I would like to keep the border at the bottom part only in UITextField. But I don\'t know how we can keep it on the bottom side.

Can you please advise m

Answer 1

If you want to do without knowing frames beforehand, without subclassing and without Autolayout:

Swift 5 / Swift 4.x / Swift 3.x

extension UITextField {
  func setBottomBorder() {
    self.borderStyle = .none
    self.layer.backgroundColor = UIColor.white.cgColor

    self.layer.masksToBounds = false
    self.layer.shadowColor = UIColor.gray.cgColor
    self.layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
    self.layer.shadowOpacity = 1.0
    self.layer.shadowRadius = 0.0
  }
}

Call as yourTextField.setBottomBorder() from anywhere without making sure of the frames to be right.

The Result looks like this:

Swift UI

struct MyTextField: View {
  var myPlaceHolder: String
  @Binding var text: String

  var underColor: Color
  var height: CGFloat

  var body: some View {
    VStack {
        TextField(self.myPlaceHolder, text: $text)
        .padding()
        .font(.title)

        Rectangle().frame(height: self.height)
            .padding(.horizontal, 24).foregroundColor(self.underColor)
    }
  }
}