Question

所以我想要添加＆＃34;副标题＆＃34;在导航控制器导航栏中的标题下。

到目前为止，我查找的所有内容都要我使用CGRect。我不知道那是什么，这听起来像是想让我创造一个不是我想做的全新观点。

我的问题是，是否有点方法可以轻松添加字幕视图？

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

显然去年这个有效，但现在我收到了错误，它在我的viewDidLoad中......

我试过了：

self.navigationController？.navigationItem.prompt =＆＃34; Subtitle Here＆＃34;

它是唯一不会显示任何错误但仍然无法正常工作的东西。它实际上什么都不做。至少在运行时没有任何可见的东西。

另一方面，swift是首选。谢谢！

Answer 1

这是我在扩展程序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 2

虽然有解决方案，但它有一些已知问题

解决方案是写一个像这样的函数

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标题视图

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

只有已知的问题是，如果字幕变得非常大，则会发生错位。

最终结果

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

Answer 3

非常感谢您的回答！ @RajanMaheshwari

除了你使用widthDiff做的if语句外，你的编码工作得很好。

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！

Answer 4

@iosjillian的Swift 4扩展程序效果很好，添加了一些功能以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
  }
}

Answer 5

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;

Answer 6

感谢@RajanMaheshwari的答案

如果有任何人在副标题文字比标题文字长的情况下出现标题错位的问题，我将以下代码添加到Rajan的上面的答案中，正好在实例化字幕标题的地方：

// 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

Answer 7

迅速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 8

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，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

Answer 9

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＆＃39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
    }

}

在Xcode中导航栏控制器的标题下添加字幕

9 个答案: