无法使图像适合UITextField的边界内

Question

我正在尝试将图像缩小到UITextField的大小并将其自身定位在它的左侧，但我只能得到它：

我在做什么错？

这里是相关代码：

//MARK: - Add Left Image to UITextField

func addLeftImageTo(txtField: UITextField, image img: UIImage) {
    let leftImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
    leftImageView.image = img
    txtField.addSubview(leftImageView)
    txtField.leftView = leftImageView
    txtField.leftViewMode = .always
}

let image1 = UIImage(named: "stopwatch")

addLeftImageTo(txtField: timerTextField, image: image1!)

timerTextField.anchor(top: repsTextField.bottomAnchor, leading: view.safeAreaLayoutGuide.leadingAnchor, bottom: notesTextField.topAnchor, trailing: view.safeAreaLayoutGuide.trailingAnchor, padding: .init(top: 50.adjusted, left: 100.adjusted, bottom: 50.adjusted, right: 100.adjusted))

Answer 1

尝试将UIImageView包装在UIView中

您的代码：

func addLeftImageTo(txtField: UITextField, image img: UIImage) {
        let leftImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
        leftImageView.image = img
        txtField.addSubview(leftImageView)
        txtField.leftView = leftImageView
        txtField.leftViewMode = .always
    }

示例：

func addLeftImageTo(txtField: UITextField, image img: UIImage) {
    let height = txtField.frame.size.height
    let wrapView = UIView(frame: CGRect(x: 0, y: 0, width: height, height: height))

    let leftImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: height, height: height))
    leftImageView.image = img
    leftImageView.contentMode = .scaleToFill
    wrapView.addSubview(leftImageView)

    txtField.addSubview(wrapView)
    txtField.leftView = wrapView
    txtField.leftViewMode = .always
}

此外，我还添加了几行，包括height，contentMode，以防万一。

希望对您有帮助。

Answer 2

首先在UITextField中添加图像的以下方法

  func setleftPaddingInTextfieldwithImage(_ textfield : UITextField, padding : 
   CGFloat, strImgname : String)
   {

        let imageView = UIImageView(image: UIImage(named: strImgname))
        imageView.frame = CGRect(x: 0, y: 0, width: 15 , height: 15)

        imageView.contentMode = .scaleAspectFit

        let paddingView = UIView.init()
        paddingView.frame = CGRect(x: padding, y: 0, width: padding, height: textfield.frame.size.height)

        paddingView.addSubview(imageView)
        textfield.leftView = paddingView
        textfield.leftViewMode = .always

   }

在视图控制器中调用

 self.setleftPaddingInTextfieldwithImage(YourTextField, padding: padding, strImgname: "stopwatch")