ios - iOS 11 导航栏中大标题的多行

Question

是否可以让 iOS 11 中导航栏的新大标题显示多行？ App Store 应用程序执行此操作，但我在当前文档中找不到任何内容来执行此操作。如果太长，标准行为只显示一行带省略号。

Answer 1

将以下代码添加到 viewWillAppear 中:

    navigationController?.navigationBar.prefersLargeTitles = true
    self.navigationController?.navigationItem.largeTitleDisplayMode = .automatic

    self.title = "Hello big text, For navigation large style bar"
    navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black, NSAttributedStringKey.font : UIFont.preferredFont(forTextStyle: .largeTitle)]

    var count = 0
    for item in(self.navigationController?.navigationBar.subviews)! {
        for sub in item.subviews{
            if sub is UILabel{
                if count == 1 {
                    break;
                }
                let titleLab :UILabel = sub as! UILabel
                titleLab.numberOfLines = 0
                titleLab.text = self.title
                titleLab.lineBreakMode = .byWordWrapping
                count = count + 1
            }
        }

    }
    self.navigationController?.navigationBar.layoutSubviews()
    self.navigationController?.navigationBar.layoutIfNeeded()

后退按钮面临的问题将很快更新..