如何使导航栏均匀地半透明? [英] How can I make my navigation bar uniformly semi-transparent?

问题描述

我正在iOS 7上编写一个应用程序，但似乎无法掌握NavigationBar和工具栏的透明度，如何将导航栏设置为不透明度为50％的黑色?

I'm writing an app on iOS 7, and I can't seem to get a handle on the transparency of the navigationBar and the toolbar, how can I set the navigation bar to black at 50% opacity?

我已经阅读了到ios7指南的过渡，并且观看了wwdc13讲座214，但是我的状态栏与其余的导航栏相比仍然具有不同的透明度.

I've read the transition to ios7 guide and I've watched the wwdc13 lecture 214, but my status bar still has a different transparency than the rest of the attached nav bar.

这是我的代码:

// APP-WIDE THEMING
[[UINavigationBar appearance] setBarStyle:UIBarStyleBlackOpaque];
[[UINavigationBar appearance] setBackgroundColor:[UIColor blueColor]];  
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

这是我的问题的屏幕截图: http://grab.by/qiyU

Here is the screenshot of my problem: http://grab.by/qiyU

推荐答案

将背景图片设置为nil，并使用alpha设置背景颜色.

Set the background image to nil, and set the background color with alpha.

[ctrl.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault]; 
ctrl.navigationController.navigationBar.backgroundColor = [UIColor colorWithRed:0 Green:0 Blue:0 Alpha:.5];

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