在Swift中的图像上添加阴影

import CoreGraphics
import UIKit

let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
imageView.image = UIImage(named: "yourImageName")

let shadowLayer = CALayer()
imageView.layer.addSublayer(shadowLayer)

shadowLayer.shadowColor = UIColor.black.cgColor
shadowLayer.shadowOpacity = 0.5
shadowLayer.shadowOffset = CGSize(width: 2, height: 2)
shadowLayer.shadowRadius = 5

let shadowPath = UIBezierPath(rect: imageView.bounds)
shadowLayer.shadowPath = shadowPath.cgPath