让 UIBarButtonItem 指向右侧的标准方法？
当新的视图控制器被推入导航堆栈时，标准支持带有前一个视图控制器标题的后退按钮。该按钮“指向”左侧而不是圆角矩形。
是否有标准方法来创建“指向”右侧的 UIBarButtonItem？该按钮将用作 rightBarButtonItem。
When a new view controller is pushed onto the navigation stack, there is standard support for a back button with the title of the previous view controller. This button "points" to the left rather than having a rounded rectanglar shape.
Is there a standard way to create a UIBarButtonItem that "points" to the right? This button would be used as the rightBarButtonItem.
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使用 Three20 库，您可以轻松完成此操作，而无需自己创建图像（并且它将根据需要正确调整大小）在您的文本上）：
此屏幕截图来自 Three20 附带的示例应用程序。
Using the Three20 library you can do it easily without creating an image yourself (and it will size up correctly depending on your text):
This screenshot comes from the example application that comes with Three20.
您可以使用与 iPhone UI 小部件一起浮动的 PNG 文件之一（示例）。将左指按钮在 Photoshop 或其他图像编辑工具中水平翻转，使其指向右侧。
然后将
UIButton插入到rightBarButtonItem视图中，使用水平翻转的小部件作为其图像属性。You could use one of the PNG files floating around with iPhone UI widgets (example). Take the left-pointing button and flip it horizontally in Photoshop or another image editing tool to make it point right-wards.
Then insert a
UIButtoninto therightBarButtonItemview, using the horizontally-flipped widget as its image property.