如何向 UITextField 的 rightView 内的 UIImageView 添加填充？

Question

所以我在 UITextField 的右侧添加了一个 UIImageView，但我需要在右侧添加一点填充，这样它就不会一直锚定到右侧。我尝试添加一个自定义框架，但没有奏效，所以我不太确定如何获得该填充。任何帮助将不胜感激。

See TextField Example Here

let titleField : UITextField = {
        let titleField = UITextField()
        titleField.placeholder = "Title"
        titleField.textAlignment = .center
        titleField.backgroundColor = .white
        titleField.addDoneCancelToolbar()
        
        var imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 10, height: 10))
        let image = UIImage(systemName: "exclamationmark.circle")?.withTintColor(.systemRed, renderingMode: .alwaysOriginal)
        imageView.image = image
        titleField.rightView = imageView
        titleField.rightViewMode = .always
//        titleField.rightView?.isHidden = true
        
        return titleField
    }()

Answer 1

只需添加扩展名：

extension UITextField {
    func rightImage(_ image: UIImage?, imageWidth: CGFloat, padding: CGFloat) {
        let imageView = UIImageView()
        imageView.frame = CGRect(x: padding + 2, y: 0, width: imageWidth, height: frame.height)
        imageView.contentMode = .scaleAspectFit
        imageView.image = image
        let containerView = UIView(frame: CGRect(x: 0, y: 0, width: imageWidth + padding , height: frame.height))
        containerView.addSubview(imageView)
        rightView = containerView
        rightViewMode = .always
    }
}

使用它：

if let image = UIImage(named: imagename + ".png") {
    titlefield.rightImage(image, imageWidth: 30, padding: 5)
}

Answer 2

继承 UITextField 并覆盖 https://developer.apple.com/documentation/uikit/uitextfield/1619638-rightviewrect。