使用Core Graphics/Cocoa,您可以从后台线程绘制到位图上下文吗？

DispatchQueue.global(qos: .background).async {
    // 创建位图上下文
    let colorSpace = CGColorSpaceCreateDeviceRGB()
    let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)
    let context = CGContext(data: nil, width: Int(width), height: Int(height), bitsPerComponent: 8, bytesPerRow: 0, space: colorSpace, bitmapInfo: bitmapInfo.rawValue)

    // 在位图上下文中进行绘制
    context?.setFillColor(UIColor.red.cgColor)
    context?.fill(CGRect(x: 0, y: 0, width: width, height: height))

    // 将位图上下文转换为图像
    let image = context?.makeImage()

    // 将图像传输到主线程上进行显示
    DispatchQueue.main.async {
        let imageView = UIImageView(image: UIImage(cgImage: image!))
        self.view.addSubview(imageView)
    }
}