ios - backBarbuttonitem 什么都不做？

Question

我已经以编程方式设置了导航

在 View Controller 中，我设置了一个后退按钮，并且只根据文档更改标题。然而，点击子 Controller 中的后退按钮什么都不做。

我错过了什么？

> in a viewController

    let backItem = UIBarButtonItem()
    backItem.title = ""
    navigationItem.backBarButtonItem = backItem
    self.navigationController?.pushViewController(secondViewController, animated: true)

Answer 1

您必须向按钮添加目标和操作，

let backItem = UIBarButtonItem()
backItem.title = ""
backItem.target = self
backItem.action = #selector(back)
navigationItem.backBarButtonItem = backItem
self.navigationController?.pushViewController(secondViewController, animated: true)

然后实现back()函数。

func back() {
    // If your view controller was presented by a navigation controller
    self.navigationController?.popViewControllerAnimated(true)

    // If your view controller was presented modally
    self.presentingViewController?.dismiss(animated: true, completion: nil)
}