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

IosObjective CSwiftXamarinSwiftui

Ios Problem Overview

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 me?

Ios Solutions

Solution 1 - Ios

I am creating custom textField to make it reusable component for SwiftUI

SwiftUI

struct CustomTextField: View {
    var placeHolder: String
    @Binding var value: String
    
    var lineColor: Color
    var width: CGFloat
    
    var body: some View {
        VStack {
            TextField(self.placeHolder, text: $value)
            .padding()
            .font(.title)
            
            Rectangle().frame(height: self.width)
                .padding(.horizontal, 20).foregroundColor(self.lineColor)
        }
    }
}

Usage:

@Binding var userName: String
@Binding var password: String

var body: some View {
    VStack(alignment: .center) {
        CustomTextField(placeHolder: "Username", value: $userName, lineColor: .white, width: 2)
        CustomTextField(placeHolder: "Password", value: $password, lineColor: .white, width: 2)
    }
}

Swift 5.0

I am using Visual Formatting Language (VFL) here, This will allow adding a line to any UIControl.

You can create a UIView extension class like UIView+Extention.swift

import UIKit

enum LinePosition {
    case top
    case bottom
}

extension UIView {
    func addLine(position: LinePosition, color: UIColor, width: Double) {
        let lineView = UIView()
        lineView.backgroundColor = color
        lineView.translatesAutoresizingMaskIntoConstraints = false // This is important!
        self.addSubview(lineView)

        let metrics = ["width" : NSNumber(value: width)]
        let views = ["lineView" : lineView]
        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[lineView]|", options:NSLayoutConstraint.FormatOptions(rawValue: 0), metrics:metrics, views:views))

        switch position {
        case .top:
            self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[lineView(width)]", options:NSLayoutConstraint.FormatOptions(rawValue: 0), metrics:metrics, views:views))
            break
        case .bottom:
            self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[lineView(width)]|", options:NSLayoutConstraint.FormatOptions(rawValue: 0), metrics:metrics, views:views))
            break
        }
    }
}

Usage:

textField.addLine(position: .LINE_POSITION_BOTTOM, color: .darkGray, width: 0.5)

Objective C:

You can add this helper method to your global helper class(I used global class method) or in the same view controller(using an instance method).

typedef enum : NSUInteger {
    LINE_POSITION_TOP,
    LINE_POSITION_BOTTOM
} LINE_POSITION;


- (void) addLine:(UIView *)view atPosition:(LINE_POSITION)position withColor:(UIColor *)color lineWitdh:(CGFloat)width {
    // Add line
    UIView *lineView = [[UIView alloc] init];
    [lineView setBackgroundColor:color];
    [lineView setTranslatesAutoresizingMaskIntoConstraints:NO];
    [view addSubview:lineView];
    
    NSDictionary *metrics = @{@"width" : [NSNumber numberWithFloat:width]};
    NSDictionary *views = @{@"lineView" : lineView};
    [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[lineView]|" options: 0 metrics:metrics views:views]];
    
    switch (position) {
        case LINE_POSITION_TOP:
            [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[lineView(width)]" options: 0 metrics:metrics views:views]];
            break;
            
        case LINE_POSITION_BOTTOM:
            [view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[lineView(width)]|" options: 0 metrics:metrics views:views]];
            break;
        default: break;
    }
}

Usage:

[self addLine:self.textField atPosition:LINE_POSITION_TOP withColor:[UIColor darkGrayColor] lineWitdh:0.5];

Xamarin code:

 var border = new CALayer();
 nfloat width = 2;
 border.BorderColor = UIColor.Black.CGColor;
 border.Frame = new CoreGraphics.CGRect(0, textField.Frame.Size.Height - width, textField.Frame.Size.Width, textField.Frame.Size.Height);
 border.BorderWidth = width;
 textField.Layer.AddSublayer(border);
 textField.Layer.MasksToBounds = true;

Solution 2 - Ios

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:

>sample

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)
    }
  }
}

Solution 3 - Ios

You can create a subclass of UITextField as shown below:

class TextField : UITextField {
    
    override var tintColor: UIColor! {
        
        didSet {
            setNeedsDisplay()
        }
    }
    
    override func draw(_ rect: CGRect) {

        let startingPoint   = CGPoint(x: rect.minX, y: rect.maxY)
        let endingPoint     = CGPoint(x: rect.maxX, y: rect.maxY)
        
        let path = UIBezierPath()
        
        path.move(to: startingPoint)
        path.addLine(to: endingPoint)
        path.lineWidth = 2.0
        
        tintColor.setStroke()
        
        path.stroke()
    }
}

Solution 4 - Ios

None of these solutions really met my expectations. I wanted to subclass the TextField since I don't want to set the border manually all the time. I also wanted to change the border color e.g. for an error. So here's my solution with Anchors:

class CustomTextField: UITextField {

    var bottomBorder = UIView()

    override func awakeFromNib() {

            // Setup Bottom-Border
        
            self.translatesAutoresizingMaskIntoConstraints = false
        
            bottomBorder = UIView.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
            bottomBorder.backgroundColor = UIColor(rgb: 0xE2DCD1) // Set Border-Color
            bottomBorder.translatesAutoresizingMaskIntoConstraints = false
        
            addSubview(bottomBorder)
        
            bottomBorder.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
            bottomBorder.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
            bottomBorder.rightAnchor.constraint(equalTo: rightAnchor).isActive = true
            bottomBorder.heightAnchor.constraint(equalToConstant: 1).isActive = true // Set Border-Strength

    }
}

---- Optional ----

To change the color add sth like this to the CustomTextField Class:

@IBInspectable var hasError: Bool = false {
    didSet {
        
        if (hasError) {
            
            bottomBorder.backgroundColor = UIColor.red
            
        } else {
            
            bottomBorder.backgroundColor = UIColor(rgb: 0xE2DCD1)
            
        }
        
    }
}

And to trigger the Error call this after you created an instance of CustomTextField

textField.hasError = !textField.hasError

enter image description here

Hope it helps someone ;)

Solution 5 - Ios

 extension UITextField {  
  func setBottomBorder(color:String) {
    self.borderStyle = UITextBorderStyle.None
    let border = CALayer()
    let width = CGFloat(1.0)
    border.borderColor = UIColor(hexString: color)!.cgColor
    border.frame = CGRect(x: 0, y: self.frame.size.height - width,   width:  self.frame.size.width, height: self.frame.size.height)
    border.borderWidth = width
    self.layer.addSublayer(border)
    self.layer.masksToBounds = true
   }
}

and then just do this:

yourTextField.setBottomBorder(color: "#3EFE46")

Solution 6 - Ios

You can create this extension outside class and replace width with whatever borderWidth you want.

Swift 4

extension UITextField
{
    func setBottomBorder(withColor color: UIColor)
    {
        self.borderStyle = UITextBorderStyle.none
        self.backgroundColor = UIColor.clear
        let width: CGFloat = 1.0
        
        let borderLine = UIView(frame: CGRect(x: 0, y: self.frame.height - width, width: self.frame.width, height: width))
        borderLine.backgroundColor = color
        self.addSubview(borderLine)
    }
}

Original

extension UITextField
{
    func setBottomBorder(borderColor: UIColor)
    {
        self.borderStyle = UITextBorderStyle.None
        self.backgroundColor = UIColor.clearColor()
        let width = 1.0

        let borderLine = UIView(frame: CGRectMake(0, self.frame.height - width, self.frame.width, width))
        borderLine.backgroundColor = borderColor
        self.addSubview(borderLine)
    }
}

and then add this to your viewDidLoad replacing yourTextField with your UITextField variable and with any color you want in the border

yourTextField.setBottomBorder(UIColor.blackColor())

This basically adds a view with that color at the bottom of the text field.

Solution 7 - Ios

enter image description here

Objective C

        [txt.layer setBackgroundColor: [[UIColor whiteColor] CGColor]];
        [txt.layer setBorderColor: [[UIColor grayColor] CGColor]];
        [txt.layer setBorderWidth: 0.0];
        [txt.layer setCornerRadius:12.0f];
        [txt.layer setMasksToBounds:NO];
        [txt.layer setShadowRadius:2.0f];
        txt.layer.shadowColor = [[UIColor blackColor] CGColor];
        txt.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
        txt.layer.shadowOpacity = 1.0f;
        txt.layer.shadowRadius = 1.0f;

Swift

        txt.layer.backgroundColor = UIColor.white.cgColor
        txt.layer.borderColor = UIColor.gray.cgColor
        txt.layer.borderWidth = 0.0
        txt.layer.cornerRadius = 5
        txt.layer.masksToBounds = false
        txt.layer.shadowRadius = 2.0
        txt.layer.shadowColor = UIColor.black.cgColor
        txt.layer.shadowOffset = CGSize.init(width: 1.0, height: 1.0)
        txt.layer.shadowOpacity = 1.0
        txt.layer.shadowRadius = 1.0

Solution 8 - Ios

What I did was to create an extension to UITextField and added a Designer editable property. Setting this property to any color would change the border (bottom) to that color (setting other borders to none).

Since this also requires to change the place holder text color, I also added that to the extension.

    extension UITextField {
    
    @IBInspectable var placeHolderColor: UIColor? {
        get {
            return self.placeHolderColor
        }
        set {
            self.attributedPlaceholder = NSAttributedString(string:self.placeholder != nil ? self.placeholder! : "", attributes:[NSForegroundColorAttributeName: newValue!])
        }
    }

    
    @IBInspectable var bottomBorderColor: UIColor? {
        get {
            return self.bottomBorderColor
        }
        set {
            self.borderStyle = UITextBorderStyle.None;
            let border = CALayer()
            let width = CGFloat(0.5)
            border.borderColor = newValue?.CGColor
            border.frame = CGRect(x: 0, y: self.frame.size.height - width,   width:  self.frame.size.width, height: self.frame.size.height)
            
            border.borderWidth = width
            self.layer.addSublayer(border)
            self.layer.masksToBounds = true
            
        }
    }
}

Solution 9 - Ios

On Swift 3. You can create an extension and add after your view class.

extension UITextField
{
    func setBottomBorder(borderColor: UIColor)
    {

        self.borderStyle = UITextBorderStyle.none
        self.backgroundColor = UIColor.clear
        let width = 1.0
        
        let borderLine = UIView()
        borderLine.frame = CGRect(x: 0, y: Double(self.frame.height) - width, width: Double(self.frame.width), height: width)
        
        borderLine.backgroundColor = borderColor
        self.addSubview(borderLine)
    }
}

Solution 10 - Ios

Here is swift3 code with @IBInspectable

create a new file Cocoa Touch Class Swift File

import UIKit


extension UIView {

@IBInspectable var cornerRadius: CGFloat {
    get {
        return layer.cornerRadius
    }
    set {
        layer.cornerRadius = newValue
        layer.masksToBounds = newValue > 0
    }
}

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

@IBInspectable var borderColor: UIColor? {
    get {
        return UIColor(cgColor: layer.borderColor!)
    }
    set {
        layer.borderColor = newValue?.cgColor
    }
}

@IBInspectable var leftBorderWidth: CGFloat {
    get {
        return 0.0   // Just to satisfy property
    }
    set {
        let line = UIView(frame: CGRect(x: 0.0, y: 0.0, width: newValue, height: bounds.height))
        line.translatesAutoresizingMaskIntoConstraints = false
        line.backgroundColor = UIColor(cgColor: layer.borderColor!)
       line.tag = 110
        self.addSubview(line)
        
        let views = ["line": line]
        let metrics = ["lineWidth": newValue]
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[line(==lineWidth)]", options: [], metrics: metrics, views: views))
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[line]|", options: [], metrics: nil, views: views))
    }
}

@IBInspectable var topBorderWidth: CGFloat {
    get {
        return 0.0   // Just to satisfy property
    }
    set {
        let line = UIView(frame: CGRect(x: 0.0, y: 0.0, width: bounds.width, height: newValue))
        line.translatesAutoresizingMaskIntoConstraints = false
        line.backgroundColor = borderColor
       line.tag = 110
        self.addSubview(line)
        
        let views = ["line": line]
        let metrics = ["lineWidth": newValue]
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[line]|", options: [], metrics: nil, views: views))
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[line(==lineWidth)]", options: [], metrics: metrics, views: views))
    }
}

@IBInspectable var rightBorderWidth: CGFloat {
    get {
        return 0.0   // Just to satisfy property
    }
    set {
        let line = UIView(frame: CGRect(x: bounds.width, y: 0.0, width: newValue, height: bounds.height))
        line.translatesAutoresizingMaskIntoConstraints = false
        line.backgroundColor = borderColor
       line.tag = 110
        self.addSubview(line)
        
        let views = ["line": line]
        let metrics = ["lineWidth": newValue]
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "[line(==lineWidth)]|", options: [], metrics: metrics, views: views))
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[line]|", options: [], metrics: nil, views: views))
    }
}
@IBInspectable var bottomBorderWidth: CGFloat {
    get {
        return 0.0   // Just to satisfy property
    }
    set {
        let line = UIView(frame: CGRect(x: 0.0, y: bounds.height, width: bounds.width, height: newValue))
        line.translatesAutoresizingMaskIntoConstraints = false
        line.backgroundColor = borderColor
      line.tag = 110
        self.addSubview(line)
        
        let views = ["line": line]
        let metrics = ["lineWidth": newValue]
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[line]|", options: [], metrics: nil, views: views))
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[line(==lineWidth)]|", options: [], metrics: metrics, views: views))
    }
}
 func removeborder() {
      for view in self.subviews {
           if view.tag == 110  {
                view.removeFromSuperview()
           }
           
      }
 }

}

and replace the file with the below code and you will get the option in storyboard attribute inspector like this

enter image description here

Enjoy :)

Solution 11 - Ios

** Here myTF is outlet for MT TEXT FIELD **

        let border = CALayer()
        let width = CGFloat(2.0)
        border.borderColor = UIColor.darkGray.cgColor
        border.frame = CGRect(x: 0, y: self.myTF.frame.size.height - width, width:  self.myTF.frame.size.width, height: self.myTF.frame.size.height)

        border.borderWidth = width
        self.myTF.layer.addSublayer(border)
        self.myTF.layer.masksToBounds = true

Solution 12 - Ios

SwiftUI

in SwiftUI, there is a View called Divider that is perfectly matched for this. You can add it below any view by embedding them into a simple VStack:

VStack {
    Text("This could be any View")
    Divider()
}

Solution 13 - Ios

you can create one image for bottom border and set it to the background of your UITextField :

 yourTextField.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"yourBorderedImageName"]];

or set borderStyle to none and put image of line exactly equal length to textfield!

Solution 14 - Ios

Updated Code:

Swift 5.0

extension UITextField {
  func addUnderline() { 
   let layer = CALayer()
   layer.backgroundColor = #colorLiteral(red: 0.6666666865, green: 0.6666666865, blue: 0.6666666865, alpha: 1)
   layer.frame = CGRect(x: 0.0, y: self.frame.size.height - 1.0, width: self.frame.size.width, height: 1.0)
   self.clipsToBounds = true
   self.layer.addSublayer(layer)
   self.setNeedsDisplay()} }

Now call this func in viewDidLayoutSubviews()

override func viewDidLayoutSubviews() {
    textField.addUnderline()
}

NOTE: This method will only work in viewDidLayoutSubviews()

Solution 15 - Ios

I have looked at each of these solutions that also seem to work with one issue. Dark Mode and the background setting

The Background setting of the UITextField must match the background of the parent view or no line appears

So this will work on light mode To get to work in dark mode change the background color to black and it works Exclude back color and the line does not appear

let field = UITextField() 
field.backgroundColor = UIColor.white
field.bottomBorderColor = UIColor.red

This ended up being the best solution for me

extension UITextField {
      
    func addPadding() {
        let paddingView = UIView(frame: CGRect(x:0, y:0, width: 10, height: self.frame.height))
        self.leftView = paddingView
        self.leftViewMode = .always
      }
      
      @IBInspectable var placeHolderColor: UIColor? {
          get {
              return self.placeHolderColor
          }
          set {
            self.attributedPlaceholder = NSAttributedString(string:self.placeholder != nil ? self.placeholder! : "", attributes:[NSAttributedString.Key.foregroundColor: newValue!])
          }
      }
    
      @IBInspectable var bottomBorderColor: UIColor? {
          get {
              return self.bottomBorderColor
          }
          set {
            self.borderStyle = .none
            self.layer.masksToBounds = false
            self.layer.shadowColor = newValue?.cgColor
            self.layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
            self.layer.shadowOpacity = 1.0
            self.layer.shadowRadius = 0.0
          }
      }
    }

Solution 16 - Ios

let border = CALayer()
     let lineWidth = CGFloat(0.3)
     border.borderColor = UIColor.lightGray.cgColor
     border.frame = CGRect(x: 0, y: emailTextField.frame.size.height - lineWidth, width:  emailTextField.frame.size.width, height: emailTextField.frame.size.height)
     border.borderWidth = lineWidth
     emailTextField.layer.addSublayer(border)
     emailTextField.layer.masksToBounds = true

Tutorial

Solution 17 - Ios

In SwiftUI, The simplest implementation would be,

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(.horizontal, 24)
        .font(.title)

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

Usage:

MyTextField(myPlaceHolder: "PlaceHolder", text: self.$text, underColor: .red, height: 3)

Example Implementation

Solution 18 - Ios

You can use this ORGANIZED and can also CUSTOMIZE this extension further:

> "One Line Implementation" in viewDidAppear(so that frame size will be correct):

// Add layer in your textfield    
yourTextField.addLayer(.bottom).addPadding(.left)


// Extension
    extension UITextField {
    
    enum Position {
        case up, bottom, right, left
    }
    
    //  MARK: - Add Single Line Layer
    func addLayer(_ position: Position) -> UITextField {
        
        // bottom layer
        let bottomLayer = CALayer()
        // set width
        let height = CGFloat(1.0)
        bottomLayer.borderWidth = height
        // set color
        bottomLayer.borderColor = UIColor.white.cgColor
        // set frame
        // y position changes according to the position
        let yOrigin = position == .up ? 0.0 : frame.size.height - height
        bottomLayer.frame = CGRect.init(x: 0, y: yOrigin, width: frame.size.width, height: height)
        layer.addSublayer(bottomLayer)
        layer.masksToBounds = true
        
        return self
    }
    
    // Add right/left padding view in textfield
    func addPadding(_ position: Position, withImage image: UIImage? = nil) {
        let paddingHeight = frame.size.height
        let paddingViewFrame = CGRect.init(x: 0.0, y: 0.0, width: paddingHeight * 0.6, height: paddingHeight)
        let paddingImageView = UIImageView.init(frame: paddingViewFrame)
        paddingImageView.contentMode = .scaleAspectFit
        
        if let paddingImage = image {
            paddingImageView.image = paddingImage
        }
        
        // Add Left/Right view mode
        switch position {
        case .left:
            leftView        = paddingImageView
            leftViewMode    = .always
        case .right:
            rightView       = paddingImageView
            rightViewMode    = .always
        default:
            break
        }
    }
}

Solution 19 - Ios

import UIkit 

extension UITextField

{

func underlinedLogin()

{

    let border = CALayer()

    let width = CGFloat(1.0)

    border.borderColor = UIColor.black.cgColor
    border.frame = CGRect(x: 0, y: self.frame.size.height - width, width:  self.frame.size.width, height: self.frame.size.height)
    border.borderWidth = width
    self.layer.addSublayer(border)
    self.layer.masksToBounds = true
}

}

call method on viewdidload

mobileNumberTextField.underlinedLogin()

passwordTextField.underlinedLogin()

//select like text field on mainstoryboard

image

Solution 20 - Ios

For View : (Most Recommended)

It works for all type of UIView subclass (view, textfiled, label, etc...) using UIView extension

It is more simple and convenient. But the only condition is the view must contain an auto layout.

extension UIView {
    enum Line_Position {
        case top
        case bottom
    }

    func addLine(position : Line_Position, color: UIColor, height: Double) {
        let lineView = UIView()
        lineView.backgroundColor = color
        lineView.translatesAutoresizingMaskIntoConstraints = false // This is important!
        self.addSubview(lineView)
        
        let metrics = ["width" : NSNumber(value: height)]
        let views = ["lineView" : lineView]
        self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[lineView]|", options:NSLayoutConstraint.FormatOptions(rawValue: 0), metrics:metrics, views:views))
        
        switch position {
        case .top:
            self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[lineView(width)]", options:NSLayoutConstraint.FormatOptions(rawValue: 0), metrics:metrics, views:views))
            break
        case .bottom:
            self.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[lineView(width)]|", options:NSLayoutConstraint.FormatOptions(rawValue: 0), metrics:metrics, views:views))
            break
        }
    }
}

How to use?

// UILabel
self.lblDescription.addLine(position: .bottom, color: UIColor.blue, height: 1.0)

enter image description here
and

// UITextField
self.txtArea.addLine(position: .bottom, color: UIColor.red, height: 1.0)

enter image description here

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