从iPhone上的其他两个UIImages创建一个UIImage

import UIKit

func createImageFromImages(image1: UIImage, image2: UIImage) -> UIImage? {
    let size = CGSize(width: max(image1.size.width, image2.size.width), height: image1.size.height + image2.size.height)
    
    let renderer = UIGraphicsImageRenderer(size: size)
    
    let image = renderer.image { ctx in
        image1.draw(at: .zero)
        image2.draw(at: CGPoint(x: 0, y: image1.size.height))
    }
    
    return image
}