如何在IOS 8中使UINavigationBar透明？

Question

我已经尝试了很多让UINavigationBar透明的东西.但我没有成功.我设置的图像是透明的.这是我的代码.有帮助吗？提前致谢.

 [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]
 }];

Answer 1

试试这个

   [self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                         forBarMetrics:UIBarMetricsDefault];
    self.navigationController.navigationBar.shadowImage = [UIImage new];
    self.navigationController.navigationBar.translucent = YES;
    self.navigationController.view.backgroundColor = [UIColor clearColor];

我希望上面的代码有所帮助.

Answer 2

尝试添加此代码.它在iOS 8中适用于我.

[self.navigationController.navigationBar setTranslucent:YES];
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor]

使用此代码,您甚至不需要添加透明UIImage.如果有帮助,请在这里更新.

Answer 3

谢谢大家.问题是我在视图控制器中添加了这一行:

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

self.edgesForExtendedLayout = UIRectEdgeNone;

代码有效.