Swift 读写图片占用大量内存

我正在为macOS写一个Swift应用程序，它可以叠加图像.

我试着创建一个小项目来读取一幅图像，并将其写入1000次.

我使用DispatchQueue.全局，使UI可以自由显示操作编号.

如果你有任何 idea ；)

谢谢

代码如下:

import SwiftUI

struct ContentView: View {
    
    @State private var presentImageImporter = false
    @State private var runningComputation = 1
    @State private var inputImage: NSImage?
    
    var body: some View {
        
        VStack {
            
            Button("Image") {
                presentImageImporter = true
            }.fileImporter(isPresented: $presentImageImporter, allowedContentTypes: [.png, .jpeg]) { result in
                switch result {
                    case .success(let url):
                        if url.startAccessingSecurityScopedResource() {
                               inputImage = NSImage(byReferencing: url)
                            url.stopAccessingSecurityScopedResource()
                        }
                    case .failure(let error):
                        print(error)
                }
            }
            
            Button("Compute 1000 read image") {
                runComputations()
            }
            Divider()
            Text("\(runningComputation)")
            Divider()
        }.frame(minWidth: 200, minHeight: 200)
    }
    
    func runComputations() {
        
                
            let downloadDir = try! FileManager.default.url(
                for: FileManager.SearchPathDirectory.downloadsDirectory,
                in: FileManager.SearchPathDomainMask.userDomainMask,
                appropriateFor: nil,
                create: true)
            
            let subFolder = downloadDir.appendingPathComponent("toto")
        
            try! FileManager.default.createDirectory(at: subFolder, withIntermediateDirectories: true)
            
            DispatchQueue.global(qos: .userInitiated).async {
                for i in 0...1000 {
                    
                    writePNG(inputImage!, url: subFolder.appendingPathComponent("image\(i).png"))
                    
                    runningComputation += 1
                }
            }
            
       
    }
    
}

func writePNG(_ image: NSImage, url: URL) {
    let newRep = NSBitmapImageRep(data: image.tiffRepresentation!)
    newRep!.size = image.size
    let pngData = newRep!.representation(using: .png, properties: [:])
    
    do {
        try pngData!.write(to: url)
    } catch {
        print(error)
    }
}

和跟踪图像