iOS 13 中的条形按钮色调颜色

Question

在 iOS 13 中，他们改变了导航栏颜色的操作方式。现在他们使用 UINavigationBarAppearance 和 UIBarButtonItemAppearance 来自定义导航栏，以及 standardAppearance 和 scrollEdgeAppearance。

我正在寻找一种方法来为standardAppearance 和scrollEdgeAppearance 设置不同的导航栏色调颜色。或者能够为每个外观更改条形按钮图标颜色。

        //set the standard nav bar appearance
        let navBarAppearance = UINavigationBarAppearance()
        navBarAppearance.configureWithOpaqueBackground()
        navBarAppearance.titleTextAttributes = [.foregroundColor: UIColor.white]
        navBarAppearance.largeTitleTextAttributes = [.foregroundColor: UIColor.white]
        navBarAppearance.backgroundColor = UIColor.mainAppColorForNavBar

        //set bar button appearance
        let buttonAppearance = UIBarButtonItemAppearance()
        buttonAppearance.normal.titleTextAttributes = [.foregroundColor : UIColor.white]
        navBarAppearance.buttonAppearance = buttonAppearance

        UINavigationBar.appearance(whenContainedInInstancesOf: [UINavigationController.self]).standardAppearance = navBarAppearance



        //set the scroll edge nav bar appearance
        let scrollNavBarAppearance = UINavigationBarAppearance()
        scrollNavBarAppearance.configureWithOpaqueBackground()
        scrollNavBarAppearance.titleTextAttributes = [.foregroundColor: UIColor.label]
        scrollNavBarAppearance.largeTitleTextAttributes = [.foregroundColor: UIColor.label]

        //set bar button appearance
        let scrollButtonAppearance = UIBarButtonItemAppearance()
        scrollButtonAppearance.normal.titleTextAttributes = [.foregroundColor : UIColor.label]
        scrollNavBarAppearance.buttonAppearance = scrollButtonAppearance

        UINavigationBar.appearance(whenContainedInInstancesOf: [UINavigationController.self]).scrollEdgeAppearance = scrollNavBarAppearance

这将设置导航栏色调颜色，但不区分 standardAppearance 和 scrollEdgeAppearance。

UINavigationBar.appearance().tintColor = UIColor.white

当前处于 scrollEdgeAppearance （看起来像我想要的那样，不需要更改）

当前在 standardAppearance （按钮丢失，因为它与背景颜色相同，我想在 standardAppearance 中将图标颜色更改为白色）

任何帮助表示赞赏。

谢谢，

Answer 1

我在后退按钮上遇到了类似的问题，并通过为每种外观设置具有不同渲染模式的图像来解决它。这避免了应用tintColor。

// demo image
let image = UIImage(systemName: "ellipsis.circle")!

// image with .alwaysOriginal rendering mode to avoid tintColor application
let imageForNavBarAppearance = image
    .withTintColor(.black)
    .withRenderingMode(.alwaysOriginal)
let imageForScrollNavBarAppearance = image
    .withTintColor(.green)
    .withRenderingMode(.alwaysOriginal)

// your UINavigationBarAppearance instances
navBarAppearance.setBackIndicatorImage(imageForNavBarAppearance, transitionMaskImage: imageForNavBarAppearance)
scrollNavBarAppearance.setBackIndicatorImage(imageForScrollNavBarAppearance, transitionMaskImage: imageForScrollNavBarAppearance)

这仅解决了后退按钮的问题。

还有另外两个选项可以为栏项目外观设置背景图像。

UINavigationBarAppearance.buttonAppearance 带有背景图像的外观配置将应用于所有栏项目。这应该没问题，因为您只有一项酒吧项目。

UINavigationBarAppearance.doneButtonAppearance 如果您要为右上角的“+”符号创建完成样式栏项目，则应应用此外观配置。

let ap = UIBarButtonItemAppearance()
ap.normal.backgroundImage = image.withTintColor(.black).withRenderingMode(.alwaysOriginal)

let scrollAp = UIBarButtonItemAppearance()
scrollAp.normal.backgroundImage = image.withTintColor(.green).withRenderingMode(.alwaysOriginal)

// apply to all bar items
navBarAppearance.buttonAppearance = ap
scrollNavBarAppearance.buttonAppearance = scrollAp

// or apply to done buttons
navBarAppearance.doneButtonAppearance = ap
scrollNavBarAppearance.doneButtonAppearance = scrollAp