使 UINavigationBar 透明 [英] Make UINavigationBar transparent

问题描述

如何使 UINavigationBar 透明?虽然我希望它的栏项目保持可见.

How do you make a UINavigationBar transparent? Though I want its bar items to remain visible.

推荐答案

如果有人想知道如何在 iOS 7+ 中实现这一点，这里有一个解决方案(iOS 6 也兼容)

If anybody is wondering how to achieve this in iOS 7+, here's a solution (iOS 6 compatible too)

在 Objective-C 中

In Objective-C

[self.navigationBar setBackgroundImage:[UIImage new]
                         forBarMetrics:UIBarMetricsDefault];
self.navigationBar.shadowImage = [UIImage new];
self.navigationBar.translucent = YES;

在 swift 3 (iOS 10) 中

In swift 3 (iOS 10)

self.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationBar.shadowImage = UIImage()
self.navigationBar.isTranslucent = true

在 swift 2

self.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
self.navigationBar.shadowImage = UIImage()
self.navigationBar.translucent = true

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讨论

在导航栏上将 translucent 设置为 YES 可以解决问题，这是由于 UINavigationBar 文档.我将在此处报告相关片段:

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Discussion

Setting translucent to YES on the navigation bar does the trick, due to a behavior discussed in the UINavigationBar documentation. I'll report here the relevant fragment:

如果您在带有不透明自定义背景图像的导航栏上将此属性设置为 YES，导航栏将对图像应用小于 1.0 的系统不透明度.

If you set this property to YES on a navigation bar with an opaque custom background image, the navigation bar will apply a system opacity less than 1.0 to the image.

这篇关于使 UINavigationBar 透明的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！