我正试图从Macaw SVG(节点)转换为NSImage。我在Macaw论坛上找到了IOS的示例代码,但无法在Cocoa中运行。
Macaw库中有作为MGraphicsBeginImageContext的所有缺少函数(UIGraphicsBeginImageContext等)的引用,但尚未能够访问它们(使用未解析的标识符UIGraphicsBeginImageContext)
这是原始文章的示例代码https://github.com/exyte/Macaw/pull/382#issuecomment-393422770
func svgToImge(resourceName: String, size: CGSize) -> NSImage {
if let rootNode = try? SVGParser.parse(path: resourceName)
{
let macawView = MacawView(node: rootNode, frame:CGRect(origin: CGPoint.zero, size: size))
UIGraphicsBeginImageContext(size)
macawView.layer.render(in: UIGraphicsGetCurrentContext()!)
let img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img!
} else {
return NSImage()
}
}
最佳答案
以下是Macaw制造商提供的经过修改的代码,似乎可以解决这个问题。我需要添加一个逆变器,因为图像是颠倒的,他们原来的建议NSGraphicsContext.current?.graphicsPort看起来不稳定/不可靠,我最终使用了NSGraphicsContext.current?.cgContext代替:
func svgToNSImage(resourcePath: String, size: CGSize) -> NSImage? {
if let rootNode = try? SVGParser.parse(path: resourcePath) {
let macawView = MacawView(node: rootNode, frame: CGRect(origin: CGPoint.zero, size: size))
macawView.wantsLayer = true
let image = NSImage(size: macawView.bounds.size)
image.lockFocus()
// if let ctx = NSGraphicsContext.current?.graphicsPort {
if let ctx = NSGraphicsContext.current?.cgContext {
// image is drawing upside down, invert it and render
ctx.translateBy(x: 0, y: size.height)
ctx.scaleBy(x: 1.0, y: -1.0)
macawView.layer?.render(in: ctx)
}
image.unlockFocus()
return image
} else { return nil }
}