There's a strange iOS 7 thing about UINavigationBar. If you try to set it's barTintColor property to [UIColor clearColor] or any color with a alpha = 0, it totally ignores that value. So for instance, if you write:
UINavigationBar有一个奇怪的ios7功能。如果您试图将它的barTintColor属性设置为[UIColor clearColor]或任何alpha = 0的颜色，它将完全忽略该值。例如，如果你写:
[[navigationBar setBarTintColor:[UIColor clearColor]];
It doesn't respect the "clear" part at all. Same result with colorWithRed:green:blue:alpha.
它根本不尊重“清晰”的部分。与colorWithRed相同的结果:格林:蓝色:α。
But the most interesting part is, if you set translucent property to NO, then it will take the color you specified BUT with alpha 1. So if I specify colorWithRed:1 green:0 blue:0 alpha:0 it will be set to pure red with alpha as 1.
但是最有趣的部分是，如果你将半透明属性设置为NO，那么它将采用你指定的颜色，但是是1。如果我指定colorWithRed:1绿色:0蓝色:0阿尔法:0它将被设置为纯红色，阿尔法为1。
How can I achieve it? Is there any possible solution to make it a completely invisible barTintColor, although it requires hacky methods?
我怎样才能做到呢?是否有可能的解决方案使它成为完全不可见的barTintColor，尽管它需要一些陈腐的方法?
3 个解决方案
#1
4
If you want a clear navigation controller try setting the background image of the navigation controller to use a clear PNG file (1x1 transparent, no color).
如果您想要一个清晰的导航控制器，请尝试设置导航控制器的背景图像来使用一个清晰的PNG文件(1x1透明，无颜色)。
#2
1
This works for me
这适合我
navigationBar.translucent = true
navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
#3
0
My answer is very similar to Brian's with a suggestion made by David although it's not the same. I'm posting it so it saves time for anyone trying to do this.
我的回答和布莱恩的答案很相似，大卫的建议虽然不一样。我把它贴出来，这样可以节省时间。
// Forcing transparent background.
navigationBar.translucent = YES;
navigationBar.backgroundImage = [[UIImage alloc] init];
It is important to set translucent to YES. Otherwise the bar will be black. I tested it on iOS 7.1.1.
将半透明设置为YES是很重要的。否则，酒吧将是黑色的。我在ios7.1.1上测试过。
#1
4
If you want a clear navigation controller try setting the background image of the navigation controller to use a clear PNG file (1x1 transparent, no color).
如果您想要一个清晰的导航控制器，请尝试设置导航控制器的背景图像来使用一个清晰的PNG文件(1x1透明，无颜色)。
#2
1
This works for me
这适合我
navigationBar.translucent = true
navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
#3
0
My answer is very similar to Brian's with a suggestion made by David although it's not the same. I'm posting it so it saves time for anyone trying to do this.
我的回答和布莱恩的答案很相似，大卫的建议虽然不一样。我把它贴出来，这样可以节省时间。
// Forcing transparent background.
navigationBar.translucent = YES;
navigationBar.backgroundImage = [[UIImage alloc] init];
It is important to set translucent to YES. Otherwise the bar will be black. I tested it on iOS 7.1.1.
将半透明设置为YES是很重要的。否则，酒吧将是黑色的。我在ios7.1.1上测试过。