添加底线以在Swift / Objective C / Xamarin中查看

时间：2014-11-07 12:08:05

标签： ios objective-c swift xamarin uitextfield

我想将边框仅保留在UITextField的底部。 但我不知道如何将它保持在最低端。

你可以告诉我吗？

21 个答案:

答案 0 :(得分：287)

新方法:(推荐）

最终，我找到了另一种方法，它更简单方便。但唯一的条件是UITextField必须包含自动布局。

我在这里使用视觉格式语言（VFL），这将允许向任何UIControl添加一行。

帮助方法：

您可以将此辅助方法添加到全局帮助程序类（我使用全局类方法）或在同一视图控制器中（使用实例方法）。

typedef enum : NSUInteger {
    LINE_POSITION_TOP,
    LINE_POSITION_BOTTOM
} LINE_POSITION;


- (void) addLineToView:(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;
    }
}

<强>用法： 

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

使用Swift：

帮助方法： 

enum LINE_POSITION {
    case LINE_POSITION_TOP
    case LINE_POSITION_BOTTOM
}

func addLineToView(view : UIView, position : LINE_POSITION, color: UIColor, width: Double) {
        let lineView = UIView()
        lineView.backgroundColor = color
        lineView.translatesAutoresizingMaskIntoConstraints = false // This is important!
        view.addSubview(lineView)

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

        switch position {
        case .LINE_POSITION_TOP:
            view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[lineView(width)]", options:NSLayoutFormatOptions(rawValue: 0), metrics:metrics, views:views))
            break
        case .LINE_POSITION_BOTTOM:
            view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[lineView(width)]|", options:NSLayoutFormatOptions(rawValue: 0), metrics:metrics, views:views))
            break
        default:
            break
        }
    }

<强>用法： 

self.addLineToView(view: textField, position:.LINE_POSITION_BOTTOM, color: UIColor.darkGray, width: 0.5)

旧方法：

如果以编程方式创建UITextField对象，此答案将完美无缺。

注意：如果在Storyboard中创建了UITextField对象，则在Storyboard Attributes Inspector中将其Border Style属性设置为None。

以下变量textField是UITextField控件的对象，其中将设置底部边框。

Swift代码： 

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

border.borderWidth = width
textField.layer.addSublayer(border)
textField.layer.masksToBounds = true

目标C代码： 

CALayer *border = [CALayer layer];
CGFloat borderWidth = 2;
border.borderColor = [UIColor darkGrayColor].CGColor;
border.frame = CGRectMake(0, textField.frame.size.height - borderWidth, textField.frame.size.width, textField.frame.size.height);
border.borderWidth = borderWidth;
[textField.layer addSublayer:border];
textField.layer.masksToBounds = YES;

Xamarin代码： 

 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;

许多用户遇到自动布局的问题，有些人无法呈现UITextField的边框。这是解决方案：

如果您在viewDidLoad()方法下面写下代码，那么您将无法获得textField的框架，因此该边框将无法正确呈现。

要获取边框的正确框架，请覆盖viewDidLayoutSubviews()并在其中编写代码。

将所有子视图加载到视图中后调用的

viewDidLayoutSubviews()方法。

不要忘记这个方法被多次调用，并且它不是ViewController生命周期的一部分，所以在使用它时要小心。

答案 1 :(得分：141)

如果你想事先做不知道框架，没有子类化和没有Autolayout ：

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
  }
}

从任何地方呼叫yourTextField.setBottomBorder()，而不确定帧是否正确。

结果如下所示：

  

sample

答案 2 :(得分：40)

您可以创建UITextField的子类，如下所示：

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()
    }
}

答案 3 :(得分：22)

这些解决方案都没有达到我的期望。我想继承 TextField，因为我不想一直手动设置边框。我还想更改边框颜色，例如为了一个错误。所以这是我的Anchors解决方案：

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

    }
}

----可选----

要像这样更改颜色添加到CustomTextField Class：

@IBInspectable var hasError: Bool = false {
    didSet {

        if (hasError) {

            bottomBorder.backgroundColor = UIColor.red

        } else {

            bottomBorder.backgroundColor = UIColor(rgb: 0xE2DCD1)

        }

    }
}

在创建CustomTextField实例

后触发错误调用 
textField.hasError = !textField.hasError

enter image description here

希望它可以帮到某人;）

答案 4 :(得分：21)

 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
   }
}

然后就这样做：

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

答案 5 :(得分：11)

您可以在类外创建此扩展，并将宽度替换为您想要的任何borderWidth。

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)
    }
}

<强>原始 

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)
    }
}

然后将其添加到viewDidLoad中，用您的UITextField变量替换yourTextField，并在边框中使用您想要的任何颜色

yourTextField.setBottomBorder(UIColor.blackColor())

这基本上会在文本字段的底部添加一个带有该颜色的视图。

答案 6 :(得分：10)

enter image description here

目标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;

<强>夫特 

        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

答案 7 :(得分：6)

我所做的是为UITextField创建扩展并添加Designer可编辑属性。将此属性设置为任何颜色会将边框（底部）更改为该颜色（将其他边框设置为无）。

由于这也需要更改占位符文本颜色，我还将其添加到扩展名。 

    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

        }
    }
}

答案 8 :(得分：6)

在Swift上3.您可以创建一个扩展名并在视图类之后添加。

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)
    }
}

答案 9 :(得分：6)

请查看下面的代码示例；

快捷键4： 

@IBDesignable class DesignableUITextField: UITextField {

    let border = CALayer()

    @IBInspectable var borderColor: UIColor? {
        didSet {
            setup()
        }
    }

    @IBInspectable var borderWidth: CGFloat = 0.5 {
        didSet {
            setup()
        }
    }

    func setup() {
        border.borderColor = self.borderColor?.cgColor

        border.borderWidth = borderWidth
        self.layer.addSublayer(border)
        self.layer.masksToBounds = true
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        border.frame = CGRect(x: 0, y: self.frame.size.height - borderWidth, width:  self.frame.size.width, height: self.frame.size.height)
    }
 }

答案 10 :(得分：3)

这是带有@IBInspectable的swift3代码

创建一个新文件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()
           }

      }
 }

}

并使用以下代码替换该文件，您将在storyboard属性检查器中获得此选项

enter image description here

享受：）

答案 11 :(得分：1)

**这里myTF是MT TEXT FIELD **的出口

        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

答案 12 :(得分：1)

迅速5 您可以使用UIView扩展，以便可以在任何视图中添加底边框：

extension UIView {

    func addBottomLine(width: CGFloat, color: UIColor) {
        let lineView: UIView = {
            let view = UIView()
            view.translatesAutoresizingMaskIntoConstraints = false
            view.backgroundColor = color
            return view
        }()
        addSubview(lineView)
        NSLayoutConstraint.activate([
            lineView.heightAnchor.constraint(equalToConstant: width),
            lineView.leadingAnchor.constraint(equalTo: leadingAnchor),
            lineView.trailingAnchor.constraint(equalTo: trailingAnchor),
            lineView.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
    }

}

答案 13 :(得分：0)

您可以为底部边框创建一个图像并将其设置为UITextField的背景：

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

或将borderStyle设置为none，并将行的图像长度设置为textfield！

答案 14 :(得分：0)

查看：（最推荐）

它使用UIView

适用于所有类型的UIView extension子类（视图，文本文件，标签等）。

它更加简单方便。但是唯一的条件是view必须包含自动布局。

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
        }
    }
}

如何使用？ 

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

enter image description here
和

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

enter image description here

答案 15 :(得分：0)

更新的代码：

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()} }

现在在 viewDidLayoutSubviews（）

中调用此函数 
override func viewDidLayoutSubviews() {
    textField.addUnderline()
}

注意：：该方法仅适用于 viewDidLayoutSubviews（）

答案 16 :(得分：0)

我研究了似乎也可以解决一个问题的每种解决方案。深色模式和背景设置

UITextField的Background设置必须与父视图的背景匹配，否则将不显示任何行

所以这将适用于灯光模式 要在黑暗模式下工作，请将背景颜色更改为黑色，即可使用 排除背景色，线条不出现

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

这最终成为我的最佳解决方案

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
          }
      }
    }

答案 17 :(得分：0)

SwiftUI

在SwiftUI中，有一个Divider与此完美匹配的VStack。您可以通过将其嵌入到简单的VStack { Text("This could be any View") Divider() } 中来将其添加到任何视图下面：

mvnw

答案 18 :(得分：0)

在SwiftUI中，最简单的实现是

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)
    }
  }
}

用法：

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

Example Implementation

答案 19 :(得分：-1)

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
}

}

在viewdidload上调用方法

mobileNumberTextField.underlinedLogin()

passwordTextField.underlinedLogin()

//选择mainstoryboard上的文本字段

image

答案 20 :(得分：-1)

您可以使用 ORGANIZED ，还可以自定义此扩展程序：

  

＆＃34; 一线实施＆＃34;在 viewDidAppear 中（以便框架大小正确）：

// 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
        }
    }
}
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