如何在UIAlertController动作表中右对齐UIAlertAction的图片？

方案一：基于富文本的实现（无私有API，推荐） #

通过将图片作为富文本附件追加到标题右侧，同时设置文本左对齐，这种方式不依赖系统私有视图结构，兼容性更强。

步骤代码：

// 准备目标图片与标题文本
let targetImage = UIImage(named: "your_image")!
let actionTitle = "Text 1"

// 按需调整图片尺寸
let imageSize = CGSize(width: 20, height: 20)
UIGraphicsBeginImageContextWithOptions(imageSize, false, UIScreen.main.scale)
targetImage.draw(in: CGRect(origin: .zero, size: imageSize))
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()

// 构建富文本内容
let attributedTitle = NSMutableAttributedString(string: actionTitle)
let imageAttachment = NSTextAttachment()
imageAttachment.image = resizedImage
// 调整图片与文本的垂直对齐偏移
imageAttachment.bounds = CGRect(x: 0, y: -4, width: imageSize.width, height: imageSize.height)

// 给图片和标题之间添加空格分隔
attributedTitle.append(NSAttributedString(string: "  "))
attributedTitle.append(NSAttributedString(attachment: imageAttachment))

// 设置文本左对齐
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .left
attributedTitle.addAttribute(
    .paragraphStyle,
    value: paragraphStyle,
    range: NSRange(location: 0, length: attributedTitle.length)
)

// 创建UIAlertAction并赋值富文本标题
let firstAction = UIAlertAction(title: nil, style: .default) { _ in
    // 点击事件处理逻辑
}
firstAction.setValue(attributedTitle, forKey: "attributedTitle")

方案二：修改内部视图实现（依赖私有结构，需谨慎） #

通过遍历UIAlertController的子视图，找到UIAlertAction对应的图片视图，调整其约束使其右对齐。这种方式依赖系统内部视图结构，iOS版本更新可能导致失效。

步骤代码：

// 创建UIAlertAction并设置文本左对齐
let firstAction = UIAlertAction(title: "Text 1", style: .default) { _ in
    // 点击事件处理逻辑
}
firstAction.setValue(CATextLayerAlignmentMode.left, forKey: "titleTextAlignment")
firstAction.setValue(UIImage(named: "your_image"), forKey: "image")

// 创建并弹出AlertController
let alert = UIAlertController(title: "提示", message: "这是测试弹窗", preferredStyle: .actionSheet)
alert.addAction(firstAction)

present(alert, animated: true) {
    // 递归查找Action对应的图片视图
    func findActionImageView(in view: UIView) -> UIImageView? {
        if let imageView = view as? UIImageView, imageView.image != nil {
            return imageView
        }
        for subview in view.subviews {
            if let targetView = findActionImageView(in: subview) {
                return targetView
            }
        }
        return nil
    }
    
    // 调整图片视图到右侧
    if let imageView = findActionImageView(in: alert.view) {
        imageView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            imageView.trailingAnchor.constraint(equalTo: imageView.superview!.trailingAnchor, constant: -16),
            imageView.centerYAnchor.constraint(equalTo: imageView.superview!.centerYAnchor)
        ])
    }
}

内容的提问来源于stack exchange，提问作者theEagleDev