弹出视图控制器时更改导航栏颜色 [英] Changing navigation bar color while popping view controller

问题描述

我有三个视图控制器.在第一个视图控制器(FirstVC)中，导航栏的栏色调颜色为clearColor，并且栏本身为半透明的.当我单击某些内容时，我将推到SecondVC，在该位置导航栏需要是不透明的.因此，我将barTintColor设置为某个颜色值，并将isTranslucent设置为false.当我从SecondVC推送到ThirdVC时，导航栏再次需要是半透明的.当我弹出ThirdVC并返回SecondVC时，就会出现问题.导航栏显示为一秒钟透明，然后根据需要变为不透明.我无法理解延迟的原因.

I have three view controllers. In the first view controller (FirstVC), the navigation bar's bar tint color is clearColor and the bar itself is translucent. When I click on something, I push to SecondVC where the navigation bar needs to be opaque. So I set the barTintColor to some color value and set isTranslucent to false. When I push to ThirdVC from SecondVC, the navigation bar again needs to be translucent. The issue arises when I pop the ThirdVC and go back to SecondVC. The navigation bar appears as transparent for a second and then becomes opaque as required. I'm unable to understand the reason for the delay.

从SecondVC的viewWillAppear()中调用以下方法.我曾尝试从ThirdVC的viewWillDisappear()做同样的事情，但是没有效果.

The following method is called from viewWillAppear() of SecondVC. I have tried doing the same from the viewWillDisappear()of ThirdVC, but to no effect.

fileprivate func configureNavigationBar(){

        self.navigationController?.navigationBar.setBackgroundImage(nil, for: UIBarMetrics.default)
        self.navigationController?.navigationBar.shadowImage = nil
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.barTintColor = Style.Movie.primaryBackgroundColor
        let titleDict: NSDictionary = [NSForegroundColorAttributeName: UIColor.white]
        self.navigationController?.navigationBar.titleTextAttributes = titleDict as? [String:Any]
    }

如果我向后滑动而不是点击后退"按钮，效果很好.

It works fine if I swipe back instead of tapping on the back button.

推荐答案

在thiredVC中使用此功能

use this function in thiredVC

override func willMove(toParentViewController parent: UIViewController?) {
          self.navigationController?.navigationBar.barTintColor = color use in secondVC
    }

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