ios - 使导航栏显示所需标题

我有3个视图控制器：VC1-> VC3-> VC2。从VC3到VC2的传输，由下一个代码完成：

let storyboard = UIStoryboard(name: "VCs", bundle: nil)
let myVC2 = storyboard.instantiateViewController(withIdentifier: "VC2") as? VC2
myVC2?.name = "Test"
self.navigationController?.pushViewController(myVC2!, animated: true)

在VC2的viewDidLoad()中，我从viewControllers堆栈中删除VC3，仅保留VC1：

var navigationVCs = self.navigationController?.viewControllers
navigationVCs!.remove(at: 1)
self.navigationController?.viewControllers = navigationVCs!

一切正常。但是我有一个视觉上的“问题”。当视图控制器从VC4移到VC3，并且VC3视图开始加载时，VC3的NavigationBar后退按钮首先显示VC4的标题，然后才切换到VC1标题。如何解决此问题并强制VC2显示VC1的后退按钮标题？谢谢。

最佳答案

您可以通过以下方式在VC3中将VC1的后退按钮标题传递给VC2：

if let navigationController = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController {
            if let previousVC = navigationController.viewControllers.first {
                let backItem = UIBarButtonItem()
                let title = previousVC.navigationItem.backBarButtonItem?.title
                backItem.title = title
                navigationItem.backBarButtonItem = backItem // This will show in the next view controller being pushed
            }
        }

致电之前

self.navigationController?.pushViewController(myVC2!, animated: true)

关于ios - 使导航栏显示所需标题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/57592223/