如何在圆形图像视图中显示完整的图像而不进行拉伸？

import UIKit

func displayCircularImage(image: UIImage, imageView: UIImageView) {
    // 裁剪图像为正方形
    let squareImage = cropImageToSquare(image: image)
    
    // 缩放图像
    let scaledImage = scaleImage(image: squareImage, toSize: imageView.frame.size)
    
    // 创建圆形视图
    let circularView = UIView(frame: imageView.frame)
    circularView.layer.cornerRadius = circularView.frame.size.width / 2
    circularView.clipsToBounds = true
    
    // 设置图像内容
    let imageView = UIImageView(frame: circularView.bounds)
    imageView.image = scaledImage
    imageView.contentMode = .scaleAspectFill
    circularView.addSubview(imageView)
    
    // 添加边框效果（可选）
    circularView.layer.borderWidth = 2.0
    circularView.layer.borderColor = UIColor.white.cgColor
    
    // 将圆形视图添加到父视图中
    imageView.superview?.addSubview(circularView)
}

func cropImageToSquare(image: UIImage) -> UIImage {
    let originalWidth = image.size.width
    let originalHeight = image.size.height
    let edgeLength = min(originalWidth, originalHeight)
    let x = (originalWidth - edgeLength) / 2.0
    let y = (originalHeight - edgeLength) / 2.0
    let squareRect = CGRect(x: x, y: y, width: edgeLength, height: edgeLength)
    let croppedImage = image.cgImage?.cropping(to: squareRect)
    return UIImage(cgImage: croppedImage!)
}

func scaleImage(image: UIImage, toSize size: CGSize) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
    image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
    let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return scaledImage!
}