在 Xcode 中的导航栏控制器中的标题下添加副标题

Question

所以我想在导航控制器的导航栏的标题下添加一个"subtitle"。

到目前为止，我查找的大部分内容都希望我使用 CGRect。我不太了解那是什么，听起来像是要我创建一个全新的视图，这不是我想要做的。

我的问题是，有没有点方法可以轻松添加字幕视图？

我发现的最接近的东西是在堆栈溢出上发布的，这里是 link:

显然去年这行得通，但现在我遇到了错误，它在我的 viewDidLoad 中...

我试过这个：

self.navigationController?.navigationItem.prompt = "Subtitle Here"

这是唯一不会显示任何错误但仍然不起作用的东西。它实际上什么都不做。至少在运行时间看不到任何东西。

附带说明，swift 是首选。谢谢！

Answer 1

虽然有解决方案，但存在一些已知问题

解决方案是写一个这样的函数

func setTitle(title:String, subtitle:String) -> UIView {
    let titleLabel = UILabel(frame: CGRectMake(0, -2, 0, 0))

    titleLabel.backgroundColor = UIColor.clearColor()
    titleLabel.textColor = UIColor.grayColor()
    titleLabel.font = UIFont.boldSystemFontOfSize(17)
    titleLabel.text = title
    titleLabel.sizeToFit()

    let subtitleLabel = UILabel(frame: CGRectMake(0, 18, 0, 0))
    subtitleLabel.backgroundColor = UIColor.clearColor()
    subtitleLabel.textColor = UIColor.blackColor()
    subtitleLabel.font = UIFont.systemFontOfSize(12)
    subtitleLabel.text = subtitle
    subtitleLabel.sizeToFit()

    let titleView = UIView(frame: CGRectMake(0, 0, max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), 30))
    titleView.addSubview(titleLabel)
    titleView.addSubview(subtitleLabel)

    let widthDiff = subtitleLabel.frame.size.width - titleLabel.frame.size.width

    if widthDiff < 0 {
        let newX = widthDiff / 2
        subtitleLabel.frame.origin.x = abs(newX)
    } else {
        let newX = widthDiff / 2
        titleLabel.frame.origin.x = newX
    }

    return titleView
}

在 viewDidLoad

中将此功能用于自定义导航标题视图

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

唯一已知的问题是，如果字幕变得非常大，就会发生错位。

最终结果

来源：https://gist.github.com/nazywamsiepawel/0166e8a71d74e96c7898

Answer 2

非常感谢您的回答！ @RajanMaheshwari

除了你用 widthDiff 做的 if 语句之外，你的编码工作完美..

稍微调整了一下，一切顺利。

if widthDiff < 0 {
        let newX = widthDiff / 2
        subtitleLabel.frame.origin.x = abs(newX)
    } else {
        let newX = widthDiff / 2
        titleLabel.frame.origin.x = newX
    }

再次感谢您的回复！

Answer 3

这是我在扩展上使用堆栈视图的版本。

extension UINavigationItem {
    func setTitle(title:String, subtitle:String) {
        
        let one = UILabel()
        one.text = title
        one.font = UIFont.systemFont(ofSize: 17)
        one.sizeToFit()
        
        let two = UILabel()
        two.text = subtitle
        two.font = UIFont.systemFont(ofSize: 12)
        two.textAlignment = .center
        two.sizeToFit()
        
        let stackView = UIStackView(arrangedSubviews: [one, two])
        stackView.distribution = .equalCentering
        stackView.axis = .vertical
        stackView.alignment = .center
        
        let width = max(one.frame.size.width, two.frame.size.width)
        stackView.frame = CGRect(x: 0, y: 0, width: width, height: 35)
        
        one.sizeToFit()
        two.sizeToFit()
        
        self.titleView = stackView
    }
}

Answer 4

感谢@RajanMaheshwari 的回答

如果有人遇到字幕文本长于标题文本时标题未对齐的问题，我将以下代码添加到 Rajan 的回答中，就在 subtitleLabel 实例化的下方：

// Fix incorrect width bug
if (subtitleLabel.frame.size.width > titleLabel.frame.size.width) {
    var titleFrame = titleLabel.frame
    titleFrame.size.width = subtitleLabel.frame.size.width
    titleLabel.frame = titleFrame
    titleLabel.textAlignment = .center
}

希望这对遇到与我相同问题的人有所帮助

Answer 5

另一种解决方案，仅使用一个标签和NSAttributedString来区分标题和副标题（具有不同的字体大小、粗细、颜色等）。消除了不同标签对齐的问题。

extension UIViewController {
    func setTitle(_ title: String, subtitle: String) {
        let rect = CGRect(x: 0, y: 0, width: 400, height: 50)
        let titleSize: CGFloat = 20     // adjust as needed
        let subtitleSize: CGFloat = 15

        let label = UILabel(frame: rect)
        label.backgroundColor = .clear
        label.numberOfLines = 2
        label.textAlignment = .center
        label.textColor = .black

        let text = NSMutableAttributedString()
        text.append(NSAttributedString(string: title, attributes: [.font : UIFont.boldSystemFont(ofSize: titleSize)]))
        text.append(NSAttributedString(string: "\n\(subtitle)", attributes: [.font : UIFont.systemFont(ofSize: subtitleSize)]))
        label.attributedText = text
        self.navigationItem.titleView = label
    }
}

自定义 titleView 部分基于 https://whosebug.com/a/34298491/3918865

Answer 6

如果有人正在寻找上述解决方案的 Objective-C 代码：

   UILabel *title = [[UILabel alloc]init];
   UILabel *subtitle = [[UILabel alloc]init];

   [title setFont:[UIFont systemFontOfSize:12]];
   [title setTextColor:[UIColor whiteColor]];
   [title setFont:[UIFont systemFontOfSize:17]];
   [title sizeToFit];
   title.text = @"Title";

   [subtitle setTextColor:[UIColor whiteColor]];
   [subtitle setFont:[UIFont systemFontOfSize:12]];
   [subtitle setTextAlignment:NSTextAlignmentCenter];
   [subtitle sizeToFit];
   subtitle.text = @"Subtitle Title";

   UIStackView *stackVw = [[UIStackView alloc]initWithArrangedSubviews:@[title,subtitle]];
   stackVw.distribution = UIStackViewDistributionEqualCentering;
   stackVw.axis = UILayoutConstraintAxisVertical;
   stackVw.alignment =UIStackViewAlignmentCenter;


   [stackVw setFrame:CGRectMake(0, 0, MAX(title.frame.size.width, subtitle.frame.size.width), 35)];
   self.navigationItem.titleView = stackVw;

Answer 7

我真的很喜欢@user2325031 的回答，但发现不需要调整标签大小以适合并设置框架。我还根据@GerardoMR 的建议将 stackView 的对齐方式设置为 .center。

extension UINavigationItem {

    func setTitle(_ title: String, subtitle: String) {
        let titleLabel = UILabel()
        titleLabel.text = title
        titleLabel.font = .systemFont(ofSize: 17.0)
        titleLabel.textColor = .black

        let subtitleLabel = UILabel()
        subtitleLabel.text = subtitle
        subtitleLabel.font = .systemFont(ofSize: 12.0)
        subtitleLabel.textColor = .gray

        let stackView = UIStackView(arrangedSubviews: [titleLabel, subtitleLabel])
        stackView.distribution = .equalCentering
        stackView.alignment = .center
        stackView.axis = .vertical

        self.titleView = stackView
    }

}

Answer 8

Swift 4:

import UIKit

class NavigationTitleView: UIView {

    private var contentStackView = UIStackView()
    private var titleLabel = UILabel()
    private var subTitleLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)

        viewConfig()
        addViewsConfig()
        layoutViewsConfig()

    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }


    func set(title: String, subTitle: String){

        self.titleLabel.text = title
        self.subTitleLabel.text = subTitle

    }

    private func viewConfig() {

        contentStackView.axis = .vertical
        contentStackView.alignment = .center
        contentStackView.distribution  = .fill
        contentStackView.spacing = 5


        self.backgroundColor = .clear
        self.titleLabel.textColor = .white
        self.self.subTitleLabel.textColor = .white

    }

    private func addViewsConfig() {

        contentStackView.addArrangedSubview(subTitleLabel)
        contentStackView.addArrangedSubview(titleLabel)
        self.addSubview(contentStackView)

    }

    private func layoutViewsConfig(){

        contentStackView.translatesAutoresizingMaskIntoConstraints = false
        contentStackView.centerXAnchor.constraint(equalTo: self.centerXAnchor, constant: 0.0).isActive = true
        contentStackView.centerYAnchor.constraint(equalTo: self.centerYAnchor, constant: 0.0).isActive = true

    }

}

使用：

import UIKit

class  ViewController: UIViewController {

    private var navigationTitleView = NavigationTitleView()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationItem.titleView = navigationTitleView
        navigationTitleView.set(title: "title", subTitle: "subTitle")

    }

}

Answer 9

@iosjillian 的 Swift 4 扩展效果很好，添加了更多内容以尊重栏的外观和用户字体偏好：

import UIKit

extension UINavigationItem {

  func setTitle(_ title: String, subtitle: String) {
    let appearance = UINavigationBar.appearance()
    let textColor = appearance.titleTextAttributes?[NSAttributedString.Key.foregroundColor] as? UIColor ?? .black

    let titleLabel = UILabel()
    titleLabel.text = title
    titleLabel.font = .preferredFont(forTextStyle: UIFont.TextStyle.headline)
    titleLabel.textColor = textColor

    let subtitleLabel = UILabel()
    subtitleLabel.text = subtitle
    subtitleLabel.font = .preferredFont(forTextStyle: UIFont.TextStyle.subheadline)
    subtitleLabel.textColor = textColor.withAlphaComponent(0.75)

    let stackView = UIStackView(arrangedSubviews: [titleLabel, subtitleLabel])
    stackView.distribution = .equalCentering
    stackView.alignment = .center
    stackView.axis = .vertical

    self.titleView = stackView
  }
}

在 Xcode 中的导航栏控制器中的标题下添加副标题

Add subtitle under the title in navigation bar controller in Xcode

uinavigationbar

uinavigationcontroller

uinavigationitem

swift