Texting line height on NSTextView with TextKit 2

main.swift

import AppKit
import Foundation

final class MainView: NSView {
    private let textView: NSTextView

    override init(frame frameRect: NSRect) {
        textView = NSTextView(usingTextLayoutManager: true)

        super.init(frame: frameRect)

        var constraints = [NSLayoutConstraint]()
        defer {
            NSLayoutConstraint.activate(constraints)
        }

        if let textStorage = textView.textStorage {
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.minimumLineHeight = 20.0
            paragraphStyle.maximumLineHeight = 20.0
            let text = NSAttributedString(
                string: """
                    Lorem Ipsum is simply dummy text of the
                    吾輩は猫である。名前はまだ無い。
                    printing and typesetting industry.
                    どこで生れたかとんと見当がつかぬ。
                    Lorem Ipsum has been the industry'
                    """,
                attributes: [
                    .font: NSFont(name: "Helvetica", size: 20.0)!,
                    .foregroundColor: NSColor.textColor,
                    .paragraphStyle: paragraphStyle
                ])
            textStorage.append(text)
        }

        if let layoutManager = textView.textLayoutManager {
            //layoutManager.usesFontLeading = false
            layoutManager.delegate = self
        }

        addSubview(textView)
        textView.translatesAutoresizingMaskIntoConstraints = false
        constraints.append(contentsOf: [
            textView.topAnchor.constraint(equalTo: topAnchor, constant: 10.0),
            textView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 10.0),
            textView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -10.0),
            textView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -10.0)
        ])
    }

    required init?(coder: NSCoder) {
        fatalError()
    }
}

extension MainView: NSTextLayoutManagerDelegate {
}

final class AppDelegate: NSObject {
    private let window: NSWindow

    override init() {
        window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 400.0, height: 400.0),
            styleMask: [.titled, .closable, .resizable],
            backing: .buffered,
            defer: false
        )
        window.contentView = MainView()
        super.init()
    }
}

extension AppDelegate: NSApplicationDelegate {
    func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
        true
    }

    func applicationWillFinishLaunching(_ notification: Notification) {
        window.makeKeyAndOrderFront(self)
        window.center()
    }
}

autoreleasepool {
    var psn = ProcessSerialNumber(highLongOfPSN: 0, lowLongOfPSN: UInt32(kCurrentProcess))
    TransformProcessType(&psn, ProcessApplicationTransformState(kProcessTransformToForegroundApplication))

    let app = NSApplication.shared
    let delegate = AppDelegate()
    app.delegate = delegate
    app.run()
}