Ios 在UITextField中快速添加图标/图像

我想在UITextField中添加图标/图像。图标/图像应留作占位符

我试过这个：

var imageView = UIImageView();
var image = UIImage(named: "email.png");
imageView.image = image;
emailField.leftView = imageView;

---

谢谢。

尝试添加

emailField.leftViewMode=UITextFieldViewMode。始终添加

（默认的
leftViewMode
为
Never
）

更新了Swift 4的答案

emailField.leftViewMode = UITextFieldViewMode.always

emailField.leftViewMode = .always

    import UIKit

    @IBDesignable
    class TextFieldWithImage: UITextField {

        override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
            return super.leftViewRect(forBounds: bounds)
        }

        @IBInspectable var leftImage: UIImage? {
            didSet {
                updateView()
            }
        }
        @IBInspectable var leftPadding: CGFloat = 0 {
            didSet {
                updateView()
            }
        }
        @IBInspectable var rightPadding: CGFloat = 0 {
            didSet {
                updateView()
            }
        }
        @IBInspectable var imageMaxHeight: CGFloat = 0 {
            didSet {
                updateView()
            }
        }

        @IBInspectable var color: UIColor = UIColor.lightGray {
            didSet {
                updateView()
            }
        }

        func updateView() {
            if let image = leftImage {
                leftViewMode = UITextField.ViewMode.always

                let containerSize = calculateContainerViewSize(for: image)
                let containerView = UIView(frame: CGRect(x: 0, y: 0, width: containerSize.width, height: containerSize.height))

                let imageView = UIImageView(frame: .zero)
                containerView.addSubview(imageView)
                setImageViewConstraints(imageView, in: containerView)

                setImageViewProperties(imageView, image: image)

                leftView = containerView
            } else {
                leftViewMode = UITextField.ViewMode.never
                leftView = nil
            }

            attributedPlaceholder = NSAttributedString(string: placeholder != nil ? placeholder! : "",
                    attributes: [NSAttributedString.Key.foregroundColor: color])
        }

        private func calculateContainerViewSize(for image: UIImage) -> CGSize {
            let imageRatio = image.size.height / image.size.width
            let adjustedImageMaxHeight = imageMaxHeight > self.frame.height ? self.frame.height : imageMaxHeight

            var imageSize = CGSize()
            if image.size.height > adjustedImageMaxHeight {
                imageSize.height = adjustedImageMaxHeight
                imageSize.width = imageSize.height / imageRatio
            }

            let paddingWidth = leftPadding + rightPadding

            let containerSize = CGSize(width: imageSize.width + paddingWidth, height: imageSize.height)
            return containerSize
        }

        private func setImageViewConstraints(_ imageView: UIImageView, in containerView: UIView) {
            imageView.translatesAutoresizingMaskIntoConstraints = false
            imageView.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true
            imageView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true
            imageView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -rightPadding).isActive = true
            imageView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: leftPadding).isActive = true
        }

        private func setImageViewProperties(_ imageView: UIImageView, image: UIImage) {
            imageView.contentMode = .scaleAspectFit
            imageView.image = image
            imageView.tintColor = color
        }
    }

我只想在这里补充一点：

如果要在左侧的
UITextField
上添加图像，请使用
UITextField的
leftView
属性

注意：别忘了将
leftViewMode
设置为
uitextfieldwiewmode。始终
，对于right
rightViewMode
设置为
uitextfieldwiewmode。始终和
默认设置为
uitextfieldwiewmode

@IBOutlet weak var paswd: UITextField! {
    didSet{
      paswd.setLeftView(image: UIImage.init(named: "password")!)
      paswd.tintColor = .darkGray
      paswd.isSecureTextEntry = true
    }   
 }

例如

用于在左侧添加图像

textField.leftViewMode = UITextFieldViewMode.Always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let image = UIImage(named: imageName)
imageView.image = image
textField.leftView = imageView

textField.rightViewMode = UITextFieldViewMode.Always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let image = UIImage(named: imageName)
imageView.image = image
textField.rightView = imageView

用于在右侧添加图像

textField.leftViewMode = UITextFieldViewMode.Always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let image = UIImage(named: imageName)
imageView.image = image
textField.leftView = imageView

textField.rightViewMode = UITextFieldViewMode.Always
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
let image = UIImage(named: imageName)
imageView.image = image
textField.rightView = imageView

注意：在
UITextField
左侧或右侧添加图像时，需要注意的一些事项


不要忘记给出一个
ImageView
的框架，您将在
UITextField

让imageView=UIImageView（帧：CGRect（x:0，y:0，宽度：20，高度：20））

如果图像背景为白色，则图像在
UITextField

如果要将图像添加到特定位置，则需要将
ImageView
添加为
UITextField
的子视图


Swift 3.0的更新

@马克·莫伊肯斯（Mark Moeykens）漂亮地扩展了它，并使其可设计

我在这里修改并添加了更多的功能（为右图添加底线和填充）

注意如果要在右侧添加图像，可以在interface builder的
semantic
中选择
强制从右向左
选项（但对于右侧图像填充，除非覆盖rightViewRect方法，否则将无法工作）


我已经修改了这个，可以从这里下载源代码

Sahil有一个很好的答案，我想把它扩展成一个@IBDesignable，这样开发者就可以将图像添加到情节提要上的uitextfield中

Swift 4.2
这里发生了什么事？

此可设计项允许您：


在左边设置一个图像
在UITextField的左边缘和图像之间添加填充
设置颜色，使图像和占位符文本匹配

注释


要更改图像颜色，必须遵循代码注释中的注释
图像颜色不会在情节提要中更改。您必须运行项目才能在模拟器/设备中看到颜色

可在情节提要中设计

在运行时
你为什么不选择最简单的方法呢。对于大多数情况下，你想添加图标，如字体真棒。。。只需使用font awesome library，向文本字段添加图标就很容易了，如下所示：

myTextField.setLeftViewFAIcon(icon: .FAPlus, leftViewMode: .always, textColor: .red, backgroundColor: .clear, size: nil)

您需要首先安装此swift库：
Swift 3.1

extension UITextField
{
    enum Direction
    {
        case Left
        case Right
    }

    func AddImage(direction:Direction,imageName:String,Frame:CGRect,backgroundColor:UIColor)
    {
        let View = UIView(frame: Frame)
        View.backgroundColor = backgroundColor

        let imageView = UIImageView(frame: Frame)
        imageView.image = UIImage(named: imageName)

        View.addSubview(imageView)

        if Direction.Left == direction
        {
            self.leftViewMode = .always
            self.leftView = View
        }
        else
        {
            self.rightViewMode = .always
            self.rightView = View
        }
    }

}

对于Swift 3.0，在文本字段的左侧添加图像

textField.leftView = UIImageView(image: "small-calendar")
textField.leftView?.frame = CGRect(x: 0, y: 5, width: 20 , height:20)
textField.leftViewMode = .always

我创建了一个简单的IBDesignable。你喜欢怎么用都行。只要让你的UITextField确认这个类

import UIKit

@IBDesignable
class RoundTextField : UITextField {
    @IBInspectable var cornerRadius : CGFloat = 0{
        didSet{
            layer.cornerRadius = cornerRadius
            layer.masksToBounds = cornerRadius > 0
        }
    }

    @IBInspectable var borderWidth : CGFloat = 0 {
        didSet{
            layer.borderWidth = borderWidth
        }
    }

    @IBInspectable var borderColor : UIColor? {
        didSet {
            layer.borderColor = borderColor?.cgColor
        }
    }

    @IBInspectable var bgColor : UIColor? {
        didSet {
            backgroundColor = bgColor
        }
    }

    @IBInspectable var leftImage : UIImage? {
        didSet {
            if let image = leftImage{
                leftViewMode = .always
                let imageView = UIImageView(frame: CGRect(x: 20, y: 0, width: 20, height: 20))
                imageView.image = image
                imageView.tintColor = tintColor
                let view = UIView(frame : CGRect(x: 0, y: 0, width: 25, height: 20))
                view.addSubview(imageView)
                leftView = view
            }else {
                leftViewMode = .never
            }

        }
    }

    @IBInspectable var placeholderColor : UIColor? {
        didSet {
            let rawString = attributedPlaceholder?.string != nil ? attributedPlaceholder!.string : ""
            let str = NSAttributedString(string: rawString, attributes: [NSForegroundColorAttributeName : placeholderColor!])
            attributedPlaceholder = str
        }
    }

    override func textRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: 50, dy: 5)
    }

    override func editingRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: 50, dy: 5)
    }

}

您可以将此函数放在全局文件或类之上，以便在整个应用程序中访问它。
完成此过程后，您可以根据应用程序中的要求调用此函数

        func SetLeftSIDEImage(TextField: UITextField, ImageName: String){

                let leftImageView = UIImageView()
                leftImageView.contentMode = .scaleAspectFit

                let leftView = UIView()

                leftView.frame = CGRect(x: 20, y: 0, width: 30, height: 20)
                leftImageView.frame = CGRect(x: 13, y: 0, width: 15, height: 20)
                TextField.leftViewMode = .always
                TextField.leftView = leftView

                let image = UIImage(named: ImageName)?.withRenderingMode(.alwaysTemplate)
                leftImageView.image = image
                leftImageView.tintColor = UIColor(red: 106/255, green: 79/255, blue: 131/255, alpha: 1.0)
                leftImageView.tintColorDidChange()

                leftView.addSubview(leftImageView)
            }

            SetLeftSIDEImage(TextField: Your_textField, ImageName: “YourImageName”) // call function



另一种设置占位符图标的方法&将填充设置为TextField

let userIcon = UIImage(named: "ImageName") 
setPaddingWithImage(image: userIcon, textField: txtUsername)

func setPaddingWithImage(image: UIImage, textField: UITextField){
    let imageView = UIImageView(image: image)
    imageView.contentMode = .scaleAspectFit
    let view = UIView(frame: CGRect(x: 0, y: 0, width: 60, height: 50))
    imageView.frame = CGRect(x: 13.0, y: 13.0, width: 24.0, height: 24.0)
    //For Setting extra padding other than Icon.
    let seperatorView = UIView(frame: CGRect(x: 50, y: 0, width: 10, height: 50))
    seperatorview.backgroundColor = UIColor(red: 80/255, green: 89/255, blue: 94/255, alpha: 1)
    view.addSubview(seperatorView)
    textField.leftViewMode = .always
    view.addSubview(imageView)
    view.backgroundColor = .darkGray
    textField.leftViewMode = UITextFieldViewMode.always
    textField.leftView = view
}


另一种方式，灵感来源于以前的文章，进行了扩展

我们可以把图像放在右边或左边

extension UITextField {

enum Direction {
    case Left
    case Right
}

// add image to textfield
func withImage(direction: Direction, image: UIImage, colorSeparator: UIColor, colorBorder: UIColor){
    let mainView = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 45))
    mainView.layer.cornerRadius = 5

    let view = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 45))
    view.backgroundColor = .white
    view.clipsToBounds = true
    view.layer.cornerRadius = 5
    view.layer.borderWidth = CGFloat(0.5)
    view.layer.borderColor = colorBorder.cgColor
    mainView.addSubview(view)

    let imageView = UIImageView(image: image)
    imageView.contentMode = .scaleAspectFit
    imageView.frame = CGRect(x: 12.0, y: 10.0, width: 24.0, height: 24.0)
    view.addSubview(imageView)

    let seperatorView = UIView()
    seperatorView.backgroundColor = colorSeparator
    mainView.addSubview(seperatorView)

    if(Direction.Left == direction){ // image left
        seperatorView.frame = CGRect(x: 45, y: 0, width: 5, height: 45)
        self.leftViewMode = .always
        self.leftView = mainView
    } else { // image right
        seperatorView.frame = CGRect(x: 0, y: 0, width: 5, height: 45)
        self.rightViewMode = .always
        self.rightView = mainView
    }

    self.layer.borderColor = colorBorder.cgColor
    self.layer.borderWidth = CGFloat(0.5)
    self.layer.cornerRadius = 5
}

}

使用：

if let myImage = UIImage(named: "my_image"){
    textfield.withImage(direction: .Left, image: myImage, colorSeparator: UIColor.orange, colorBorder: UIColor.black)
}

享受：）
这是马克·莫伊肯斯答案的修改版本，在图像和文本之间添加了填充，并可调整图像大小，以备有人需要

Swift 4

emailField.leftViewMode = UITextFieldViewMode.always

emailField.leftViewMode = .always

    import UIKit

    @IBDesignable
    class TextFieldWithImage: UITextField {

        override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
            return super.leftViewRect(forBounds: bounds)
        }

        @IBInspectable var leftImage: UIImage? {
            didSet {
                updateView()
            }
        }
        @IBInspectable var leftPadding: CGFloat = 0 {
            didSet {
                updateView()
            }
        }
        @IBInspectable var rightPadding: CGFloat = 0 {
            didSet {
                updateView()
            }
        }
        @IBInspectable var imageMaxHeight: CGFloat = 0 {
            didSet {
                updateView()
            }
        }

        @IBInspectable var color: UIColor = UIColor.lightGray {
            didSet {
                updateView()
            }
        }

        func updateView() {
            if let image = leftImage {
                leftViewMode = UITextField.ViewMode.always

                let containerSize = calculateContainerViewSize(for: image)
                let containerView = UIView(frame: CGRect(x: 0, y: 0, width: containerSize.width, height: containerSize.height))

                let imageView = UIImageView(frame: .zero)
                containerView.addSubview(imageView)
                setImageViewConstraints(imageView, in: containerView)

                setImageViewProperties(imageView, image: image)

                leftView = containerView
            } else {
                leftViewMode = UITextField.ViewMode.never
                leftView = nil
            }

            attributedPlaceholder = NSAttributedString(string: placeholder != nil ? placeholder! : "",
                    attributes: [NSAttributedString.Key.foregroundColor: color])
        }

        private func calculateContainerViewSize(for image: UIImage) -> CGSize {
            let imageRatio = image.size.height / image.size.width
            let adjustedImageMaxHeight = imageMaxHeight > self.frame.height ? self.frame.height : imageMaxHeight

            var imageSize = CGSize()
            if image.size.height > adjustedImageMaxHeight {
                imageSize.height = adjustedImageMaxHeight
                imageSize.width = imageSize.height / imageRatio
            }

            let paddingWidth = leftPadding + rightPadding

            let containerSize = CGSize(width: imageSize.width + paddingWidth, height: imageSize.height)
            return containerSize
        }

        private func setImageViewConstraints(_ imageView: UIImageView, in containerView: UIView) {
            imageView.translatesAutoresizingMaskIntoConstraints = false
            imageView.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true
            imageView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true
            imageView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -rightPadding).isActive = true
            imageView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: leftPadding).isActive = true
        }

        private func setImageViewProperties(_ imageView: UIImageView, image: UIImage) {
            imageView.contentMode = .scaleAspectFit
            imageView.image = image
            imageView.tintColor = color
        }
    }

要创建填充，我喜欢将图像放置在容器视图中。一旦您对图标的位置满意，就可以删除背景色


Swift 5

@IBOutlet weak var paswd: UITextField! {
    didSet{
      paswd.setLeftView(image: UIImage.init(named: "password")!)
      paswd.tintColor = .darkGray
      paswd.isSecureTextEntry = true
    }   
 }

我已经创建了扩展

extension UITextField {
  func setLeftView(image: UIImage) {
    let iconView = UIImageView(frame: CGRect(x: 10, y: 10, width: 25, height: 25)) // set your Own size
    iconView.image = image
    let iconContainerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 35, height: 45))
    iconContainerView.addSubview(iconView)
    leftView = iconContainerView
    leftViewMode = .always
    self.tintColor = .lightGray
  }
}

结果

Swift 5

与@Markus类似，但在Swift 5中：

emailTextField.leftViewMode = UITextField.ViewMode.always
emailTextField.leftViewMode = .always

SwiftUI

RoundedRectangle(cornerRadius: 50)
                .frame(height: 40)
                .colorInvert() // sets the background white
            .padding()
            .shadow(radius: 12) // adds shadow to the rectangle
                .overlay(
                    HStack(spacing: 20){

                        Image(systemName: "person")
                            .resizable()
                            .aspectRatio(contentMode: .fit)

                        TextField("Username ", text: $username)
                            .font(Font.custom("Arial", size: 25))


                            .font(.title)
                    }
                    .padding()
                    .padding()
                )

2020-合理的解决方案
关于苹果公司的疯狂

以下可能是“最清晰、最简单”的方法：


首先，必须正确移动文本

注意这一关键质量保证：

继续，我们现在必须制作并移动左侧图像：

    override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
        var r = super.leftViewRect(forBounds: bounds)
        r.origin.x += leftPadding
        return r
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        setup()
    }
    
    private func setup() {
        if let image = leftImage {
            if leftView != nil { return } // critical!
            
            let im = UIImageView()
            im.contentMode = .scaleAspectFit
            im.image = image
            
            leftViewMode = UITextField.ViewMode.always
            leftView = im
            
        } else {
            leftViewMode = UITextField.ViewMode.never
            leftView = nil
        }
    }
}

这似乎是最清晰、最可靠的方法。
使用Swift4中的扩展，我们可以轻松地将图像放在右边或左边，并在文本字段中填充。

extension UITextField {

    //MARK:- Set Image on the right of text fields

  func setupRightImage(imageName:String){
    let imageView = UIImageView(frame: CGRect(x: 10, y: 10, width: 20, height: 20))
    imageView.image = UIImage(named: imageName)
    let imageContainerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 55, height: 40))
    imageContainerView.addSubview(imageView)
    rightView = imageContainerView
    rightViewMode = .always
    self.tintColor = .lightGray
}

 //MARK:- Set Image on left of text fields

    func setupLeftImage(imageName:String){
       let imageView = UIImageView(frame: CGRect(x: 10, y: 10, width: 20, height: 20))
       imageView.image = UIImage(named: imageName)
       let imageContainerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 55, height: 40))
       imageContainerView.addSubview(imageView)
       leftView = imageContainerView
       leftViewMode = .always
       self.tintColor = .lightGray
     }

  }

将代码用作左图像设置：-

   self.password_text_field.setupLeftImage(imageName: "unlock")

输出：）

我认为基于帧的解决方案不是一个好方法，因为在某些情况下，它在iPad上是不可用的。
理想的解决方案是将约束从imageView添加到textfield right view，但这并不容易。除非需要，否则右视图似乎不在textfield视图层次结构中，因此您需要执行以下操作：

private let countryTextField:UITextField={
让countryTextField=UITextField（）
countryTextField.TranslatesAutoResizezingMaskintoConstraints=false
countryTextField.rightViewMode=.always
let button=ui按钮（类型：。系统）
setImage（UIImage（名为：“yourImageName”），用于：。正常）
button.translatesAutoresizingMaskIntoConstraints=false
countryTextField.rightView=按钮
countryTextField.setNeedsLayout（）//在textField层次结构中添加rightView
countryTextField.LayoutIfNeed（）//在t中添加rightView