Swift SafeArea　画面レイアウトが崩れる

前提・実現したいこと

Swift
TableViewでグリッド表示した画面がSafeAreaを無視していたため
コード上でSafeAreaの制限をかけたところ、どうしても画面のレイアウトが崩れてしまいました。

発生している問題・エラーメッセージ

上に添付した画像において
・左上と右上がなぜか灰色になる
・右側だけSafeAreaがまもられていない

該当のソースコード

Swift
1@IBOutlet weak var view_customtableview: UIView!
2var tableView: CustomUITableView = CustomUITableView()
3
4var topPadding:CGFloat = 0
5var bottomPadding:CGFloat = 0
6var leftPadding:CGFloat = 0
7var rightPadding:CGFloat = 0
8
9override func viewWillLayoutSubviews() {
10        super.viewWillLayoutSubviews()
11        let screenWidth:CGFloat = view.frame.size.widt 
12        let screenHeight:CGFloat = view.frame.size.height 
13        let safeAreaInsets: UIEdgeInsets
14        if #available(iOS 11, *){
15            safeAreaInsets = view.safeAreaInsets
16        }else{
17            safeAreaInsets = .zero
18        }
19        print("safeAreaInsets: (safeAreaInsets)")
20        if #available(iOS 11.0, *) {
21            let window = UIApplication.shared.keyWindow
22            topPadding = window!.safeAreaInsets.top
23            bottomPadding = window!.safeAreaInsets.bottom
24            leftPadding = window!.safeAreaInsets.left
25            rightPadding = window!.safeAreaInsets.right
26        }
27        // portrait
28        var safeAreaWidth = screenWidth - leftPadding - rightPadding
29        var safeAreaHeight = (screenHeight) - topPadding - bottomPadding
30        // landscape
31        if(screenWidth > screenHeight){
32            safeAreaWidth = screenWidth - leftPadding - rightPadding
33            safeAreaHeight = (screenHeight) - topPadding - bottomPadding
34        }
35        let rect = CGRect(x: leftPadding,
36                          y: topPadding,
37                          width: safeAreaWidth,
38                          height: safeAreaHeight)
39        tableView.frame = rect
40        view_customtableview.frame = rect
41        self.tableView.makeHeaderAndTableViewAutoLayout(uiViewController: 
42           self,tableView: tableView,drawSpaceView:view_customtableview)
43}
44
45override func viewDidLoad() {
46    super.viewDidLoad()
47    // Do any additional setup after loading the view.
48      
49       view_customtableview.translatesAutoresizingMaskIntoConstraints = false
50       UIApplication.shared.beginReceivingRemoteControlEvents()
51       self.becomeFirstResponder()
52
53       app.row = nil
54       tableView.initSetting(view: self)
55       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "no",headerText: "No",width: tableView.calWidth))
56       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "type",headerText: "類別",width: 90))
57       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "articleno",headerText: "品番",width: 95))
58       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "name",headerText: "製品名",width: 180))
59       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "count",headerText: "数",width: tableView.calWidth))
60       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "note",headerText: "備考",width: 100))
61       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "weight",headerText: "重量",width:50))
62       tableView.cols.append(GridColumn().initWithPropertyName(propertyName: "place",headerText: "保管場所",width: 115))
63
64
65tableView.rows.append(["no":"1","type":"AAA","articleno":"00000","name":"aaa","count":"4","note":"","weight":"0.000","place":""])
66       tableView.rows.append(["no":"2","type":"BBB","articleno":"00001","name":"bbb","count":"4","note":"","weight":"5.200","place":""])
67       tableView.rows.append(["no":"3","type":"CCC","articleno":"00002","name":"ccc","count":"8","note":"","weight":"4.000","place":""])
68       tableView.rows.append(["no":"4","type":"DDD","articleno":"00003","name":"ddd","count":"16","note":"","weight":"0.200","place":""])
69
70}
71