如何在Swift3

Question

我正在尝试隐藏第一个导航栏并显示所有其他导航栏，因此我使用了：

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)
}

我现在需要的是调用超级方法：super.viewWillAppear(animated)和super.viewWillDisappear(animated)，但我不知道在何处或如何提出任何建议？

Answer 1

您的代码看起来像

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)
}

Answer 2

@Karun Kumar所写的答案是正确的，但在super之后有一个空格。 viewwill出现和viewwilldisapper。

正确的代码是

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)
}