如何在Swift 4.0 Cocoa应用程序中将标准输出重定向到NSScrollView？

import Foundation

class OutputHandler: FileHandle {
    override func availableData() -> Data {
        let data = super.availableData()
        NotificationCenter.default.post(name: NSNotification.Name("OutputDataNotification"), object: data)
        return data
    }
}

let pipe = Pipe()
let outputHandler = OutputHandler(fileDescriptor: pipe.fileHandleForReading.fileDescriptor)
FileHandle.standardOutput = outputHandler

let scrollView = NSScrollView()
scrollView.hasVerticalScroller = true
scrollView.autoresizingMask = [.width, .height]

let textView = NSTextView()
textView.isEditable = false
textView.isSelectable = true
textView.autoresizingMask = .width
scrollView.documentView = textView

// 添加scrollView到视图层次结构中

NotificationCenter.default.addObserver(forName: NSNotification.Name("OutputDataNotification"), object: nil, queue: nil) { notification in
    if let data = notification.object as? Data, let outputString = String(data: data, encoding: .utf8) {
        DispatchQueue.main.async {
            textView.string += outputString
            textView.scrollToEndOfDocument(nil)
        }
    }
}