我希望我的导航栏在中间显示两件事。其中之一是列表名称，另一个是用户名称。用户名将放置在列表名称下。到目前为止我所做的是，我以编程方式创建了两个标签和一个超级视图，并设置titleView of navigationItem.

override func viewDidLoad() {
        super.viewDidLoad()
        var rectForView = CGRect(x: 0, y: 0, width: 190, height: 176)
        var viewForTitle = UIView(frame: rectForView)

        var rectForNameLabel = CGRect(x: 0, y: 63, width: 190, height: 30)
        var listNameLabel = UILabel(frame: rectForNameLabel)
        listNameLabel.text = "Name of the List...."
        listNameLabel.textAlignment = NSTextAlignment.Center
        listNameLabel.font = UIFont(name: "HelveticaNeue-Bold", size: 15)

        var rectForListLabel = CGRect(x: 0, y: 93, width: 190, height: 20)
        var usersOfListLabel = UILabel(frame: rectForListLabel)
        usersOfListLabel.text = "some Users...."
        usersOfListLabel.textAlignment = NSTextAlignment.Center
        usersOfListLabel.font = UIFont(name: "HelveticaNeue", size: 10)

        viewForTitle.addSubview(listNameLabel)
        viewForTitle.addSubview(usersOfListLabel)


        self.navigationItem.titleView = viewForTitle

The thing is, I'm picking width randomly, which leads to alignment problems in different devices. How to achieve middle alignment in my case?

方法：

• titleView始终居中
• 因此，将自定义视图的宽度设置为与navigationBar（宽度-40）

Code

private func setupNavigationItems() {
    
    let label = UILabel()
    
    label.translatesAutoresizingMaskIntoConstraints = false
    
    label.text = "aaaaa"
    label.backgroundColor = .green
    
    label.textAlignment = .left
    
    navigationItem.titleView = label
    
    if let navigationBar = navigationController?.navigationBar {
        
        label.widthAnchor.constraint(equalTo: navigationBar.widthAnchor, constant: -40).isActive = true
    }
}