缩小UINaviationBar大标题文本的大小

Question

在iOS 11之前，为了制作自定义标签，我只是这样做：

let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 40))
titleLabel.text = self.customTitleText
titleLabel.backgroundColor = .clear
titleLabel.textAlignment = .left
titleLabel.textColor = .white
titleLabel.font = UIFont.boldSystemFont(ofSize: 17)
titleLabel.adjustsFontSizeToFitWidth = true
titleLabel.minimumScaleFactor = 0.25
navigationItem.titleView = titleLabel

现在，titleView似乎不会影响大标题。如何在iOS 11中实现文本缩小？

Answer 1

你可以像这样使用：

self.navigationController?.navigationBar.prefersLargeTitles = true
self.navigationController?.navigationBar.largeTitleTextAttributes = [
        NSAttributedStringKey.foregroundColor: UIColor.red,
        NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 17)
    ]