XcodeでRunしないとウインドウコンテンツが表示されない

発生している問題

Trigged Segueでボタンを押したら遷移するようにしたはずなのですが、なぜかXcodeでRunしないとウインドウは表示されますがViewControllerが表示されません。
エラーはありません。

スクリーンショット:

ソースコード

・NewViewController.swift（問題のボタンがあるViewControllerです）

Swift
1//
2//  NewViewController.swift
3//  Run
4//
5//  Created by ________ ________ on 5/14/20.
6//  Copyright © 2020 ________ ________. All rights reserved.
7//
8
9import Cocoa
10
11class NewViewController: NSViewController {
12    
13    @IBOutlet weak var name: NSTextField!
14    @IBOutlet weak var path: NSPopUpButton!
15    @IBOutlet weak var createProject: NSTextField!
16    
17    var filePath = ""
18    var folderPath = ""
19    
20    override func viewDidLoad() {
21        super.viewDidLoad()
22        // Do view setup here.
23        
24        notCreateProject.isHidden = true
25    }
26    
27    override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
28        if segue.identifier == "new" {
29            notCreateProject.isHidden = true
30            
31            if name.stringValue.isEmpty {
32                notCreateProject.isHidden = false
33                return
34            }
35            
36            var savePath = "/Users/(NSUserName() + "/" + path.selectedItem!.title + "/" + name.stringValue)"
37            if path.selectedItem!.title == NSUserName() {
38                savePath = "/Users/(NSUserName())/(name.stringValue)"
39            } else if path.selectedItem!.title == "デスクトップ" {
40                savePath = "/Users/(NSUserName())/Desktop/(name.stringValue)"
41            } else if path.selectedItem!.title == "書類" {
42                savePath = "/Users/(NSUserName())/Documents/(name.stringValue)"
43            } else if path.selectedItem!.title == "アプリケーション" {
44                savePath = "/Users/(NSUserName())/Applications/(name.stringValue)"
45            } else if path.selectedItem!.title == "ダウンロード" {
46                savePath = "/Users/(NSUserName())/Downloads/(name.stringValue)"
47            } else if path.selectedItem!.title == "ムービー" {
48                savePath = "/Users/(NSUserName())/Movies/(name.stringValue)"
49            } else if path.selectedItem!.title == "ミュージック" {
50                savePath = "/Users/ (NSUserName())/Music/(name.stringValue)"
51            } else if path.selectedItem!.title == "ピクチャ" {
52                savePath = "/Users/(NSUserName())/Pictures/(name.stringValue)"
53            }
54            
55            print(savePath)
56            do {
57                try createDir(savePath)
58            } catch {
59                notCreateProject.isHidden = false
60                return
61            }
62            do {
63                try writeTextFile("<!DOCTYPE html>\n<html>\n    <head>\n        <title>Hello World</title>\n    </head>\n    <body>\n        Hello World!\n    </body>\n</html>", fileName: "index.html", path: savePath)
64            } catch {
65                notCreateProject.isHidden = false
66                return
67            }
68            self.filePath = name.stringValue + "/index.html"
69            self.folderPath = savePath
70            
71            print(self.filePath)
72            
73            // Editorに値渡し
74            let editor = segue.destinationController as! Editor
75            editor.pathString = self.filePath
76            editor.folderPath = self.folderPath
77            editor.name = self.name.stringValue
78            editor.preVC = "n"
79        }
80    }
81    
82    func writeTextFile(_ str: String, fileName: String, path: String) throws {
83        
84        // 作成するテキストファイルの名前
85        let textFileName = fileName
86        let initialText = str
87        
88        let documentDirectoryFileURL = path
89        
90        // ディレクトリのパスにファイル名をつなげてファイルのフルパスを作る
91        let targetTextFilePath = documentDirectoryFileURL + "/" + textFileName
92        
93        print("書き込むファイルのパス: (targetTextFilePath)")
94        
95        do {
96            try initialText.write(to: URL(fileURLWithPath: targetTextFilePath), atomically: true, encoding: String.Encoding.utf8)
97        } catch let error as NSError {
98            print("failed to write: (error)")
99            throw NSError(domain: "failed to write: (error)", code: 870, userInfo: nil)
100        }
101    }
102    
103    func createDir(_ dirPath: String) throws {
104        // ディレクトリを作成します。
105        let fileManager = FileManager.default
106        do {
107            try fileManager.createDirectory(atPath: dirPath, withIntermediateDirectories: true, attributes: nil)
108        } catch let error {
109            // エラーの場合
110            throw NSError(domain: "エラーが発生しました。ディレクトリの作成に失敗しました。(error)", code: -5, userInfo: nil)
111        }
112    }
113    
114}
115

Editor.swift

swift
1//
2//  Editor.swift
3//  Run
4//
5//  Created by ________ ________ on 5/14/20.
6//  Copyright © 2020 ________ ________. All rights reserved.
7//
8
9import Cocoa
10import WebKit
11import AVKit
12import CoreImage
13
14class Editor: NSViewController, NSPathControlDelegate, NSTableViewDelegate, NSTableViewDataSource, NSTextViewDelegate, NSTextDelegate, WKUIDelegate {
15    
16    @IBOutlet weak var path: NSPathControl!
17    @IBOutlet weak var Editor: NSTextView!
18    @IBOutlet weak var runView: WKWebView!
19    @IBOutlet weak var tableView: NSTableView!
20    @IBOutlet weak var player: AVPlayerView!
21    @IBOutlet weak var imageView: NSImageView!
22    @IBOutlet weak var scView: NSScrollView!
23    @IBOutlet weak var titleLabel: NSTextField!
24    @IBOutlet weak var customImageView: NSView!
25    @IBOutlet weak var sizeLabel: NSTextField!
26    
27    var pathString: String?
28    var folderPath: String?
29    var name = ""
30    var selectedName = ""
31    var preVC = ""
32    
33    var files: [String] = []
34    
35    override func viewDidLoad() {
36        super.viewDidLoad()
37        // Do view setup here.
38        
39        do {
40            let contentUrls = try FileManager.default.contentsOfDirectory(at: URL(fileURLWithPath: folderPath!), includingPropertiesForKeys: nil)
41            files = contentUrls.map{$0.lastPathComponent}
42        } catch let error {
43            print(error)
44        }
45        
46        Editor.delegate = self
47        path.delegate = self
48    }
49    
50    // 省略
51}
52