如何将macOS SwiftUI视图转换为图像？

Question

我知道您可以通过遵循these步骤将IOS SwiftUI视图转换为镜像，但这使用了SwiftUI扩展中的UIKit内容，而您不能在macOS SwiftUI中使用它。有人知道如何对macOS SwiftUI视图进行快照/截图吗？

Answer 1

在macOS中也可以使用相同的方法。NSHostingController类似于UIHostingController。此外，要绘制该视图，应将其添加到某个窗口：

extension View {
    func snapshot() -> NSImage? {
        let controller = NSHostingController(rootView: self)
        let targetSize = controller.view.intrinsicContentSize
        let contentRect = NSRect(origin: .zero, size: targetSize)
        
        let window = NSWindow(
            contentRect: contentRect,
            styleMask: [.borderless],
            backing: .buffered,
            defer: false
        )
        window.contentView = controller.view
        
        guard
            let bitmapRep = controller.view.bitmapImageRepForCachingDisplay(in: contentRect)
        else { return nil }
        
        controller.view.cacheDisplay(in: contentRect, to: bitmapRep)
        let image = NSImage(size: bitmapRep.size)
        image.addRepresentation(bitmapRep)
        return image
    }
}