ios - 大导航栏标题上方的字幕

Question

我想知道当使用preferredsLargeTitles功能时如何在导航栏标题上方获得字幕（如日期）。就像音乐应用一样。我也想要旁边的大按钮（例如音乐应用程序中的个人资料按钮）。我仍然希望大标题显示在顶部，并在滚动屏幕时变小（例如，音乐应用程序上的浏览页面）。



我到目前为止使用的代码是

override func viewDidLoad() {
    super.viewDidLoad()

    self.navigationController?.navigationBar.prefersLargeTitles = true
    collectionView.initialize()
    self.title = "Home Screen"
}

Answer 1

您可以设置自定义UIView

设定功能

func setTitle(title:String, subtitle:String) -> UIView {

    //Get navigation Bar Height and Width
    let navigationBarHeight = Int(self.navigationController!.navigationBar.frame.height)
    let navigationBarWidth = Int(self.navigationController!.navigationBar.frame.width)

    //Y position for Title and Subtitle
    var y_Title = 0.0
    var y_SubTitle = 0.0

    //Set Y position
    if UIDevice().userInterfaceIdiom == .phone {
        switch UIScreen.main.nativeBounds.height {
        //If screen height equal iPhone 5S and SE
        case 1136:
            y_Title = 46
            y_SubTitle = 20
            print("iPhone 5S and SE")
        //If screen height equal iPhone 6, 6+, 6S, 6S+, 7, 7+, 8, 8+ and X
        case 1334, 1920, 2208, 2436:
            y_Title = 48
            y_SubTitle = 22
            print("iPhone 6, 6+, 6S, 6S+, 7, 7+, 8, 8+ and X")
        default:
            y_Title = 46
            y_SubTitle = 36
            print("Default")
        }
    }

    //Set Font size and weight for Title and Subtitle
    let titleFont = UIFont.systemFont(ofSize: 33, weight: UIFont.Weight.bold)
    let subTitleFont = UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.semibold)

    //Title label
    let titleLabel = UILabel(frame: CGRect(x: 8.5, y: y_Title, width: 0, height: 0))
    titleLabel.backgroundColor = UIColor.clear
    titleLabel.textColor = UIColor.white
    titleLabel.font = titleFont
    titleLabel.text = title
    titleLabel.sizeToFit()

    //SubTitle label
    let subtitleLabel = UILabel(frame: CGRect(x: 8.5, y: y_SubTitle, width: 0, height: 0))
    subtitleLabel.backgroundColor = UIColor.clear
    subtitleLabel.textColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.8)
    subtitleLabel.font = subTitleFont
    subtitleLabel.text = subtitle
    subtitleLabel.sizeToFit()

    //Add Title and Subtitle to View
    let titleView = UIView(frame: CGRect(x: 0, y: 0, width: navigationBarWidth, height: navigationBarHeight))
    titleView.addSubview(titleLabel)
    titleView.addSubview(subtitleLabel)

    return titleView

}

设置导航标题视图

self.navigationItem.titleView = setTitle(title: "Title", subtitle: "Subtitle")