导航栏中的按钮图像具有不同的外观。为什么？
我试图将带有自定义图像的 UIBarButtonItem 放在 UINavigationBar 上。然而，当我这样做时，图像看起来不正确。我希望导航栏上的按钮看起来像下面的按钮。
（这是模拟器的屏幕截图，顺便说一句，不是 Interface Builder）
我通过创建一个 UIButton，使用齿轮图像作为背景，然后简单地将其拖动到 Interface Builder 中右侧栏按钮项的位置，创建了自定义 UIBarButtonItem。看到以编程方式使用前面提到的 UIButton 创建 UIBarButtonItem 因为它的“自定义视图”（-initWithCustomView）具有相同的结果，我相信这也是正在发生的事情。
我不明白的是，当我将按钮图像添加到包含在栏按钮项目中的导航栏中时，为什么按钮图像会失去其漂亮的边缘和颜色渐变。谁能告诉我吗？
提前致谢。
I'm trying to put a UIBarButtonItem with a custom image on a UINavigationBar. When I do however, the image doesn't look right. I want the button on the navigation bar to look like the one below it.
(This is a screenshot from the simulator, by the way, not Interface Builder)
I created the custom UIBarButtonItem by creating a UIButton, using the cog-wheel image as a background, and then simply dragging it to the the right bar button item place in Interface Builder. Seeing as creating a UIBarButtonItem programmatically with the aforementioned UIButton as its 'custom view' (-initWithCustomView) has the same result, I believe this is what is happening as well.
What I don't understand is why the button image lost its nice edges and color gradient when I added it to the navigation bar wrapped in a bar button item. Can anyone tell me?
Thanks in advance.
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图像没有改变。是一样的。只是放在不同的背景下，表现出来的效果是不一样的。您应该考虑增加对比度。
The image hasn't changed. It is the same. Its just that when put on different backgrounds, it is showing differently. You should consider increasing the contrast.