How to draw a transparent UIToolbar or UINavigationBar in iOS7(iOS7如何绘制透明的UIToolbar或UINavigationBar)

问题描述

我想要一个完全透明的 UIToolbar 和/或 UINavigationBar.我已经尝试过为 iOS 5 前后建议的各种咒语，但似乎都不再奏效了.

I would like an entirely transparent UIToolbar and/or UINavigationBar. I have tried the various incantations suggested for pre- and post-iOS 5 but none seem to work any more.

这在 iOS 7 中如何实现?

How might this be accomplished in iOS 7?

推荐答案

Swift 3 (iOS 10)

透明UIToolbar

self.toolbar.setBackgroundImage(UIImage(),
                                forToolbarPosition: .any,
                                barMetrics: .default)
self.toolbar.setShadowImage(UIImage(), forToolbarPosition: .any)

透明UINavigationBar

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

斯威夫特 <3

透明UIToolbar

self.toolbar.setBackgroundImage(UIImage(),
                                forToolbarPosition: UIBarPosition.Any,
                                barMetrics: UIBarMetrics.Default)
self.toolbar.setShadowImage(UIImage(),
                            forToolbarPosition: UIBarPosition.Any)

透明UINavigationBar

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

目标-C

透明UIToolbar

[self.toolbar setBackgroundImage:[UIImage new]
              forToolbarPosition:UIBarPositionAny
                      barMetrics:UIBarMetricsDefault];
[self.toolbar setShadowImage:[UIImage new]
          forToolbarPosition:UIBarPositionAny];

透明UINavigationBar

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

讨论

将导航栏上的 translucent 设置为 YES 可以解决问题，因为在 UINavigationBar 文档.我将在这里报告相关片段:

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:

如果您在具有不透明自定义背景图像的导航栏上将此属性设置为 YES，则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.

最终结果

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