navigationBar.isHidden 和 setNavigationBarHidden 之间的区别 [英] difference between navigationBar.isHidden and setNavigationBarHidden

问题描述

我有视图控制器，我从隐藏导航栏的视图控制器推送它.但我想在目标视图控制器中显示导航栏.

I have view controller which I am pushing from a view controller where navigation bar is hidden. But I want to show the navigation bar in destination view controller.

我用这个语句尝试过它没有显示导航栏.

I tried with this statement it was not showing navigationBar.

self.navigationController?.navigationBar.isHidden = false

我试过这个声明它正在工作

I tried this statement it is working

self.navigationController?.setNavigationBarHidden(false, animated: true)

我想知道有什么区别?

推荐答案

不，它们不一样，

self.navigationController?.isNavigationBarHidden

是一个 getter 属性(它会显示导航栏是否隐藏.)它只会返回一个布尔值，传达导航栏天气的状态是否隐藏.(尝试将其值分配给 bool 就像 var isHidden = self.navigationController?.isNavigationBarHidden 它会根据 NavBar 的状态为您提供 true 或 false.)

is a getter property (it shows you wheather the navBar is hidden or not.) It will just return a boolean value conveying the state of the NavBar weather it is hidden or not. (try assigning its value to bool like var isHidden = self.navigationController?.isNavigationBarHidden it will give you true of false according to state to the NavBar.)

而self.navigationController?.setNavigationBarHidden(false, animation: true)

是一个 setter 属性，它为您提供设置导航栏的状态.

is a setter propety which gives you the provision of setting the state of the navBar.

编译器不会在 self.navigationController?.isNavigationBarHidden = false 上抛出任何错误但不会做任何事情，因为您只能从这里了解状态.

Compiler does not throw any error on self.navigationController?.isNavigationBarHidden = false but will not do anything as you can only know the state from here.

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