UIBarButtonItem setBackButtonTitlePositionAdjustment 不起作用

Question

更新

我想更改导航栏中后退按钮中的箭头和文本之间的偏移量。在我设置之前它工作得很好

UINavigationBar.appearance().standardAppearance = newAppearance

这是完整的代码：

        let appearance = UINavigationBar.appearance()
        let standardAppearance = UINavigationBarAppearance()
        standardAppearance.configureWithOpaqueBackground()
        standardAppearance.backgroundColor = someColor
        standardAppearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor: titleColor]
        standardAppearance.largeTitleTextAttributes = [NSAttributedString.Key.foregroundColor: titleColor]
        standardAppearance.shadowColor = navigationShadowColor

        // if remove theses 2 line, offset code works!!!
        appearance.standardAppearance = standardAppearance
        appearance.scrollEdgeAppearance = standardAppearance

        // code to set offset
        UIBarButtonItem
            .appearance()
            .setBackButtonTitlePositionAdjustment(
                UIOffset(horizontal: -20, vertical: 0),
                for: .default)

Answer 1

UINavigationBar.appearance()当指定时会覆盖所有内容并且对所有内容都有自己的设置，因此您需要通过其自己的属性配置偏移量，例如

...
standardAppearance.backButtonAppearance.normal.titlePositionAdjustment = 
    UIOffset(horizontal: -20, vertical: 0)

appearance.standardAppearance = standardAppearance
...

UIBarButtonItem.appearance()所以不需要的部分- 只需将其删除