如何在导航栏中设置多行大标题？ （iOS 11的新功能）

问题描述

我正在其中一个应用程序的导航栏中添加大标题。问题是标题有点长，所以我需要在大标题中添加两行。如何在导航栏中添加两行大标题？

I am in process of adding large title in navigation bar in one of the application. The issue is title is little long so I will require to add two lines in large title. How can I add large title with two lines in navigation bar ?

这与默认导航栏标题无关！这是关于iOS 11中引入的大标题。因此，请务必考虑大型标题来添加建议。谢谢

This is not about default navigation bar title ! This is about large title which is introduced in iOS 11 . So make sure you add suggestions by considering large title. Thanks

推荐答案

获取导航项子视图并从中找到UILabel。

Get a navigation item subviews and locate UILabel from it.

试试这个，看看：

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

self.title = "This is multiline title for navigation bar"
self.navigationController?.navigationBar.largeTitleTextAttributes = [
                                NSAttributedStringKey.foregroundColor: UIColor.black,
                                NSAttributedStringKey.font : UIFont.preferredFont(forTextStyle: .largeTitle)
                                ]

for navItem in(self.navigationController?.navigationBar.subviews)! {
     for itemSubView in navItem.subviews {
         if let largeLabel = itemSubView as? UILabel {
             largeLabel.text = self.title
             largeLabel.numberOfLines = 0
             largeLabel.lineBreakMode = .byWordWrapping
         }
     }
}

结果如下：

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