Swift 在Xcode中导航栏控制器的标题下添加字幕

所以我想在导航控制器的导航栏标题下添加一个“字幕”

到目前为止，我查找的所有内容都希望我使用CGRect。我不知道那是什么，听起来好像是想让我创造一个全新的视角，这不是我想要做的

我的问题是，是否有一个点的方法来添加字幕视图容易

我找到的最接近的东西是在stack overflow上发布的，下面是链接：

显然，去年这是有效的，但现在我得到了错误，它在我的viewDidLoad

我试过这个：

self.navigationController？.navigationItem.prompt=“此处字幕”

这是唯一不会显示任何错误但仍然不起作用的东西。它实际上什么也不做。运行时至少没有可见的内容

---

另一方面，斯威夫特是首选。谢谢

虽然有一个解决方案，但它有一些已知的问题

解决方案是编写这样的函数

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
}

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：

非常感谢您的回答@拉詹马赫什瓦里

除了使用widthDiff

我调整了一下，一切都很顺利

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

如果widthDiff<0{
设newX=widthDiff/2
subtitleLabel.frame.origin.x=abs（newX）
}否则{
设newX=widthDiff/2
titleLabel.frame.origin.x=newX
}

---

再次感谢您的回复

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
    }
}

---

谢谢你的回答@RajanMaheshwari

如果有人在字幕文本比标题文本长时出现标题不对齐的问题，我将以下代码添加到Rajan的答案中，该答案位于字幕标签实例化的正下方：

// 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
}

---

希望这能帮助那些遇到与我相同问题的人

另一种解决方案，只使用一个标签和

nsattributestring

来区分标题和副标题（不同的字体大小、权重、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
    }
}

---

自定义标题视图部分基于

，以防任何人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;

---

我真的很喜欢@user2325031的答案，但我发现不需要调整标签的大小以适应并设置框架。根据@GerardoMR的建议，我还将stackView的对齐设置为.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
    }

}

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：

---

@iosjillian的Swift 4扩展功能非常出色，增加了更多功能，以尊重酒吧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
  }
}

---

您是否尝试过将字幕置于标题上方而非下方的

self.navigationItem.prompt=“Subtitle”

？@tktsubotatitle@RajanMaheshwari是的，我做了一个测试，发现了。@tktsubota你在开玩笑吗？它不是字幕，而是导航栏上方的一个新的独立栏，有自己的标题，这样你就有了两个栏，没用了！它将帮助您所有现有的场景，它的代码比我预期的要多得多，但它确实有效。我真的希望苹果能增加一个更简单的方法。字幕看起来并不像是那么牵强。。（顺便说一句，非常感谢！）@拉贾尼需要这样的东西，若标题是空的，那个么标题应该在中间。我必须在聊天应用程序中实现。如果用户开始键入，则显示字幕。欲了解更多信息，请参阅whatsApp.title和subtitle从导航控制器按下时从左向左滑动到中间任何解决方案@naveeds以上解决方案都可以使两个文本居中，在我的情况下，它的工作非常好！标题和副标题从左边滑到中间当从导航控制器按任何解决方法到我，这是更干净的答案，它没有魔术数字作为第一个答案。我只会在设置轴后添加

stackView.alignment=.center

，否则如果字幕更大，它不会完全居中显示。另外，我将删除对

sizeToFit（）

的最后两个调用，因为您在标签上调用了它们。默认标题是否也具有恒定的字体值17？这非常有效。根据上面的@GerardoMR注释，您可以使用UIStackView设置将标题/副标题居中：

stackView.alignment=.center

import UIKit

class  ViewController: UIViewController {

    private var navigationTitleView = NavigationTitleView()

    override func viewDidLoad() {
        super.viewDidLoad()

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

    }

}

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
  }
}