在ios 13中设置back按钮箭头色调的正确方法是什么

Question

在iOS13中，苹果引入了新的UINavigationBarAppearance代理对象来设置导航栏的外观。我几乎可以设置我需要的所有东西，除了一个小东西。后退按钮的箭头总是以蓝色呈现，我不知道如何将其设置为我想要的颜色。我使用的是旧的[[UINavigationBar appearance] setTintColor:]方法，但我认为必须有某种方法来使用UINavigationBarAppearance对象API来完成这项工作。有人知道是怎么回事吗？

Answer 1

设置外观(代理)的后退按钮颜色的新方法是：

let appearance = UINavigationBarAppearance()

// Apply the configuration option of your choice
appearance.configureWithTransparentBackground()
            
// Create button appearance, with the custom color
let buttonAppearance = UIBarButtonItemAppearance(style: .plain)
buttonAppearance.normal.titleTextAttributes = [.foregroundColor: UIColor.white]

// Apply button appearance
appearance.buttonAppearance = buttonAppearance

// Apply tint to the back arrow "chevron"
UINavigationBar.appearance().tintColor = UIColor.white

// Apply proxy
UINavigationBar.appearance().standardAppearance = appearance

// Perhaps you'd want to set these as well depending on your design:
UINavigationBar.appearance().compactAppearance = appearance
UINavigationBar.appearance().scrollEdgeAppearance = appearance

Answer 2

我在我的应用程序中有一个自定义的导航控制器设置，它根据不同的场景修改navigationBar的titleTextAttributes，tintColor和其他。

在iOS 13上运行应用程序时，backBarButtonItem箭头具有默认的蓝色。视图调试器显示，只有UIBarButtonItem的UIImageView具有这种蓝色。

我最后做的是两次设置navigationBar.tintColor，让它改变颜色...

public class MyNavigationController: UINavigationController, UINavigationControllerDelegate {

    public var preferredNavigationBarTintColor: UIColor?

    override public func viewDidLoad() {
        super.viewDidLoad()
        delegate = self
    }


    public func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {

        // if you want to change color, you have to set it twice
        viewController.navigationController?.navigationBar.tintColor = .none
        viewController.navigationController?.navigationBar.tintColor = preferredNavigationBarTintColor ?? .white

        // following line removes the text from back button
        self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)

    }

寻找解决方案时最奇怪的部分是不一致的结果，这让我认为这与视图生命周期和/或外观动画或Xcode缓存有关:)