Customize navigation bar by adding two labels instead of title in Swift

问题

I am trying to add two labels in the place where the title is shown in navigation bar, but I am struggling to do so. It would be very nice if I could achieve this with storyboard but as I can see I cannot do it.

As I have seen I need to use navigationItem but I do not know how exactly to do that. If anyone have any example or if anyone could explain me more specifically how to do so would be wonderful.

And I need to mention that I am completely unfamiliar with Obj-C, so any help would need to be in Swift.

回答1:

I am not sure if you can do it from the storyboard, but if you want to add two title labels, you can do the following in the viewDidLoad() method of the view controller for which you want the two titles:

if let navigationBar = self.navigationController?.navigationBar {
    let firstFrame = CGRect(x: 0, y: 0, width: navigationBar.frame.width/2, height: navigationBar.frame.height)
    let secondFrame = CGRect(x: navigationBar.frame.width/2, y: 0, width: navigationBar.frame.width/2, height: navigationBar.frame.height)

    let firstLabel = UILabel(frame: firstFrame)
    firstLabel.text = "First"

    let secondLabel = UILabel(frame: secondFrame)
    secondLabel.text = "Second"

    navigationBar.addSubview(firstLabel)
    navigationBar.addSubview(secondLabel)
}

In this way you can add as many subviews as you want to the navigation bar

回答2:

Here's an implementation that uses a stack view instead, which also gives you some versatility with layout of the labels:

class ViewController: UIViewController {

    lazy var titleStackView: UIStackView = {
        let titleLabel = UILabel()
        titleLabel.textAlignment = .center
        titleLabel.text = "Title"
        let subtitleLabel = UILabel()
        subtitleLabel.textAlignment = .center
        subtitleLabel.text = "Subtitle"
        let stackView = UIStackView(arrangedSubviews: [titleLabel, subtitleLabel])
        stackView.axis = .vertical
        return stackView
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.titleView = titleStackView
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()

        if view.traitCollection.horizontalSizeClass == .compact {
            titleStackView.axis = .vertical
            titleStackView.spacing = UIStackView.spacingUseDefault
        } else {
            titleStackView.axis = .horizontal
            titleStackView.spacing = 20.0
        }
    }
}

来源：https://stackoverflow.com/questions/31351307/customize-navigation-bar-by-adding-two-labels-instead-of-title-in-swift