在 Swift 4 中左侧/右侧的 UITextField 中添加图标或图像

Question

我已经在UITextField. 当我设置文本时，它位于左侧图标上方。我想在UITextField. 我使用了下面的代码。

    let imageView = UIImageView(image: UIImage(named: strImgname))
    imageView.frame = CGRect(x: 0, y: 0, width: imageView.image!.size.width , height: imageView.image!.size.height)
    let paddingView: UIView = UIView.init(frame: CGRect(x: 0, y: 0, width: 50, height: 30))        
    paddingView.addSubview(imageView)
    txtField.leftViewMode = .always
    txtField.leftView = paddingView

Answer 1

您可以使用这些功能甚至更多功能@IBDesignable进行设计UITextField，并在整个项目中使用它。

轻按图标时带有委托方法的 DesignableTextField UITextField：

import Foundation
import UIKit

protocol DesignableTextFieldDelegate: UITextFieldDelegate {
    func textFieldIconClicked(btn:UIButton)
}

@IBDesignable
class DesignableTextField: UITextField {

    //Delegate when image/icon is tapped.
    private var myDelegate: DesignableTextFieldDelegate? {
        get { return delegate as? DesignableTextFieldDelegate }
    }

    @objc func buttonClicked(btn: UIButton){
        self.myDelegate?.textFieldIconClicked(btn: btn)
    }

    //Padding images on left
    override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
        var textRect = super.leftViewRect(forBounds: bounds)
        textRect.origin.x += padding
        return textRect
    }

    //Padding images on Right
    override func rightViewRect(forBounds bounds: CGRect) -> CGRect {
        var textRect = super.rightViewRect(forBounds: bounds)
        textRect.origin.x -= padding
        return textRect
    }

    @IBInspectable var padding: CGFloat = 0
    @IBInspectable var leadingImage: UIImage? { didSet { updateView() }}
    @IBInspectable var color: UIColor = UIColor.lightGray { didSet { updateView() }}
    @IBInspectable var imageColor: UIColor = UIColor.init(hex: "3EB2FF") { didSet { updateView() }}
    @IBInspectable var rtl: Bool = false { didSet { updateView() }}

    func updateView() {
        rightViewMode = UITextFieldViewMode.never
        rightView = nil
        leftViewMode = UITextFieldViewMode.never
        leftView = nil

        if let image = leadingImage {
            let button = UIButton(type: .custom)
            button.frame = CGRect(x: 0, y: 0, width: 20, height: 20)

            let tintedImage = image.withRenderingMode(.alwaysTemplate)
            button.setImage(tintedImage, for: .normal)
            button.tintColor = imageColor

            button.setTitleColor(UIColor.clear, for: .normal)
            button.addTarget(self, action: #selector(buttonClicked(btn:)), for: UIControlEvents.touchDown)
            button.isUserInteractionEnabled = true

            if rtl {
                rightViewMode = UITextFieldViewMode.always
                rightView = button
            } else {
                leftViewMode = UITextFieldViewMode.always
                leftView = button
            }
        }

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

现在它在故事板中的可设计性如下：

注意： Rtl当设置为Off图标时，将移动到左侧UITextField

在所需的 ViewController 中符合 Delegate。

class MyViewController: UIViewController, DesignableTextFieldDelegate {
    @IBOutlet weak var txtFieldSomeSearch: DesignableTextField!
    txtFieldSomeSearch.delegate = self // can be done in storyboard as well
    ... // other codes
    func textFieldIconClicked(btn: UIButton) {
        print("MyViewController : textFieldIconClicked")
    }
    ... // other codes
}

最后输出：

Answer 2

使用Swift4中的扩展，我们可以轻松地将图像放在右侧或左侧，并填充到 TextField。

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
     }

  }

使用代码作为正确的图像设置：-

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

输出 ：）

Answer 3

please use the below code

//Left side icon
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


//Right side icon
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