将导航栏的背景图片还原为默认值 [英] Revert navigation bar's background image to default

问题描述

首先，我将导航栏的背景设置为半透明。

At first, I set navigation bar's background to translucent.

    barImage=[[self.navigationController.navigationBar backgroundImageForBarMetrics:UIBarMetricsDefault] copy];//barImage is a UIImage point     
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                             forBarMetrics:UIBarMetricsDefault];
    self.navigationController.navigationBar.shadowImage = [UIImage new];

它工作得很好。
现在我需要将导航栏的背景图片恢复为默认值。

It works well. Now I need to revert navigation bar's background image to default.

- (void)dealloc
{

    [self.navigationController.navigationBar setBackgroundImage:barImage
                                                  forBarMetrics:UIBarMetricsDefault];
    self.navigationController.navigationBar.shadowImage = nil;

}

这不起作用。我应该怎么办？

This doesn't work. What should I do?

推荐答案

不知道你是否仍然坚持这一点，但这里是反转效果的代码。我借了一个导航控制器，并将一切复制到原来的导航控制器。

Not sure if you're still stuck on this, but here's the code to reverse the effect. I borrowed a navigation controller, and copied everything over to the original navigation controller.

    UINavigationController *tempNavigationController = [[UINavigationController alloc]initWithRootViewController:[[UIViewController alloc]init]];
    [self.navigationController.navigationBar setBackgroundImage:[tempNavigationController.navigationBar backgroundImageForBarMetrics:UIBarMetricsDefault]
                                                  forBarMetrics:UIBarMetricsDefault];
    self.navigationController.navigationBar.shadowImage = [tempNavigationController.navigationBar shadowImage];
    self.navigationController.navigationBar.translucent = YES;
    self.navigationController.view.backgroundColor = tempNavigationController.view.backgroundColor;

    tempNavigationController = nil;

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