swift - 如何在 Swift3 中覆盖 viewWillDisappear

Question

我试图隐藏第一个导航栏并显示所有其他导航栏，所以我使用了:

override func viewWillAppear(_ animated: Bool) {
    // Hide the navigation bar on the this view controller
    self.navigationController?.setNavigationBarHidden(true, animated: true)
}

override func viewWillDisappear(_ animated: Bool) {
    // Show the navigation bar on other view controllers
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}

我现在需要调用 super 方法:super.viewWillAppear(animated) 和 super.viewWillDisappear(animated)，但我不知道在哪里或怎么样，有什么建议吗？

Answer 1

你的代码看起来像

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // Hide the navigation bar on the this view controller
    self.navigationController?.setNavigationBarHidden(true, animated: true)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    // Show the navigation bar on other view controllers
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}