如何在IOS 8中使UINavigationBar透明？ [英] How to make UINavigationBar Transparent in IOS 8?

问题描述

我已经尝试了很多让UINavigationBar变得透明。但是我做错了。我设置的图像是透明的。这是我的代码。
有什么帮助吗？
提前致谢。

I have tried a lot to make UINavigationBar transparent. But I failed making it so.The image which I set was transparent. Here is my code . Any help ? Thanks in advance.

 [rootNavC.navigationBar setBackgroundImage:[UIImage imageNamed:@"NAV_BG_iphone.png"] forBarMetrics:UIBarMetricsDefault];
rootNavC.navigationBar.translucent = YES;
rootNavC.navigationBar.backgroundColor = [UIColor clearColor];
[[UINavigationBar appearance] setTitleTextAttributes:@{
                           UITextAttributeTextColor : [UIColor whiteColor],
                     UITextAttributeTextShadowColor : [UIColor clearColor],
                    UITextAttributeTextShadowOffset : [NSValue valueWithUIOffset:UIOffsetMake(0, 0)],
                                UITextAttributeFont : [UIFont fontWithName:@"pastel" size:20]
 }];

推荐答案

谢谢大家。问题是我在视图控制器中添加了这一行：

Thanks all. The thing is that I am adding this line in my view controller:

if (IS_OS_7_OR_LATER)
{
    self.edgesForExtendedLayout = UIRectEdgeNone;
    self.extendedLayoutIncludesOpaqueBars = NO;
    self.automaticallyAdjustsScrollViewInsets = NO;
}

这就是代码无效的原因。当我删除该行

that is why the code is not working. When I remove the line

self.edgesForExtendedLayout = UIRectEdgeNone;

代码有效。

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