在Xcode的导航栏控制器的 Headers 下添加字幕-Java 学习之路

所以我想在导航控制器的导航栏中添加 Headers 下的“副 Headers ” .

到目前为止，我查找的大部分内容都要我使用CGRect . 我不知道那是什么，这听起来像是想要我创建一个全新的视图而不是我想做的事情 .

我的问题是，有一种点方法可以轻松添加字幕视图吗？

我发现的最接近的事情是在堆栈溢出时发布，这是链接：

Create a subtitle in navigationbar

显然去年这有效，但现在我得到错误，它在我的viewDidLoad ...

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 . 在运行时至少没有任何可见的东西 .

另一方面，swift是首选 . 谢谢！

9 回答

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
}

在 viewDidLoad 中使用此功能进行自定义导航 Headers 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，则发生错位 .

最终结果
enter image description here

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

回复于 2024-05-10T02:24:37+08:00

这是我的版本在扩展上使用堆栈视图 .

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

            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
        }
    }

回复于 2024-05-10T02:24:37+08:00

51
非常感谢您的回答！ @RajanMaheshwari

除了使用widthDiff创建的if语句之外，您的编码工作正常 .

我调整了一点，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！
回复于 2024-05-10T02:24:37+08:00

@ iosjillian的Swift 4扩展程序运行良好，增加了一点来纪念栏的外观和用户字体首选项：

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
  }
}

回复于 2024-05-10T02:24:37+08:00

如果有人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;

回复于 2024-05-10T02:24:37+08:00

2
谢谢@RajanMaheshwari的答案

如果有任何人在副 Headers 文本长于 Headers 文本时出现 Headers 未对齐的问题，我将以下代码添加到Rajan的答案中，正好在下面实例化subtitleLabel的地方：
```
// 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
}
```
希望这可以帮助遇到与我相同问题的人
回复于 2024-05-10T02:24:37+08:00

斯威夫特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")

    }

}

enter image description here

回复于 2024-05-10T02:24:37+08:00

另一种解决方案，仅使用一个标签和 NSAttributedString 来区分 Headers 和副 Headers （具有不同的字体大小，重量，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://stackoverflow.com/a/34298491/3918865

回复于 2024-05-10T02:24:37+08:00

我真的很喜欢@ user2325031的答案，但发现不需要调整标签大小以适应和设置框架 . 我还根据@ GerardoMR的建议将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
    }

}

回复于 2024-05-10T02:24:37+08:00

在Xcode的导航栏控制器的 Headers 下添加字幕

9 回答

相关问题