我相信这是因为视图控制器的视图（它总是占据整个屏幕大小）是tableview。
使用UIViewController并在其view下添加一个表视图（并添加约束以遵守底部安全区域）
或者是
使用以下命令设置表视图内容插入：

tableView.contentInset = UIEdgeInsetsMake(0, 0, UIApplication.shared.keyWindow!.safeAreaInsets.bottom, 0.0);

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如果您使用后者和目标iOS版本11以下，请确保您验证它与：

var safeAreaBottom: CGFloat = 0.0 
     if #available(iOS 11.0, *) {
         safeAreaBottom = UIApplication.shared.keyWindow!.safeAreaInsets.bottom
     }

     tableView.contentInset = UIEdgeInsetsMake(0, 0, safeAreaBottom, 0.0);

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我还注意到iOS 11中tableview的这个属性（但没有描述：/）：insetsContentViewsToSafeArea个
我还没试过，但你可以给予。也许这就是你需要的开箱即用

这是我目前的修复，以强制UITableViewController中的顶部和底部安全区域。首先，你必须将它嵌入到UINavigationController中（如果不需要，隐藏导航栏），然后：

override func viewDidLoad() {
    super.viewDidLoad()

    configureFakeSafeArea()
}

@available(iOS 11.0, *)
override func viewSafeAreaInsetsDidChange() {
    super.viewSafeAreaInsetsDidChange()

    topSafeAreaHeight?.constant = view.safeAreaInsets.top
    bottomSafeAreaHeight?.constant = view.safeAreaInsets.bottom
}

private var topSafeAreaHeight: NSLayoutConstraint?
private var bottomSafeAreaHeight: NSLayoutConstraint?

private func configureFakeSafeArea() {
    guard let view = navigationController?.view else {
        return
    }

    let topSafeArea = UIView()
    topSafeArea.backgroundColor = tableView.backgroundColor
    var topConstant: CGFloat = 0
    if #available(iOS 11.0, *) {
        topConstant = view.safeAreaInsets.top
    }
    topSafeAreaHeight = topSafeArea.heightAnchor.constraint(equalToConstant: topConstant)
    view.addSubview(topSafeArea, constraints: [
        topSafeArea.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        topSafeArea.trailingAnchor.constraint(equalTo: view.trailingAnchor),
        topSafeArea.topAnchor.constraint(equalTo: view.topAnchor),
        topSafeAreaHeight!
    ])

    let bottomSafeArea = UIView()
    bottomSafeArea.backgroundColor = tableView.backgroundColor
    var bottomConstant: CGFloat = 0
    if #available(iOS 11.0, *) {
        bottomConstant = view.safeAreaInsets.bottom
    }
    bottomSafeAreaHeight = bottomSafeArea.heightAnchor.constraint(equalToConstant: bottomConstant)
    view.addSubview(bottomSafeArea, constraints: [
        bottomSafeArea.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        bottomSafeArea.trailingAnchor.constraint(equalTo: view.trailingAnchor),
        bottomSafeArea.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        bottomSafeAreaHeight!
    ])
}

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我们不得不写所有这些代码，所以如果有人知道更简单的方法来实现这一点，请告诉我们。
P.S.我在这里使用了这个小的UIView扩展：

extension UIView {
    func addSubview(_ child: UIView, constraints: [NSLayoutConstraint]) {
        addSubview(child)
        child.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate(constraints)
    }
}

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