iOS 截屏、图片转换PDF工具方法

private func screenshot() -> UIImage? {
        let controller = UIHostingController(rootView: self)
        let view = controller.view

        let targetSize = UIScreen.main.bounds.size
        view?.frame = CGRect(origin: .zero, size: targetSize)
        view?.backgroundColor = .clear

        let renderer = UIGraphicsImageRenderer(size: targetSize)
        return renderer.image { _ in
            view?.drawHierarchy(in: controller.view.bounds, afterScreenUpdates: true)
        }
    }
    
    private func imageToPDFData(image: UIImage) -> Data? {
        let pdfRenderer = UIGraphicsPDFRenderer(bounds: CGRect(origin: .zero, size: image.size))
        let pdfData = pdfRenderer.pdfData { (context) in
            context.beginPage()
            image.draw(in: CGRect(origin: .zero, size: image.size))
        }
        return pdfData
    }