IOS 5如何更改导航栏中后退按钮的颜色？
问题描述：
我想更改导航栏的后退按钮的颜色，使其看起来像这样
I want to change the color of back button of a navigation bar to make it look like this
答
设置 backBarButtonItem > tintColor ：
Set the backBarButtonItem's tintColor:
self.navigationItem.backBarButtonItem.tintColor = [UIColor redColor];
提示：如果您希望将其应用于全部默认情况下，应用程序中的 UIBarButtonItem 实例，则可以使用新的 UIAppearance API：
TIP: If you want this to be applied to all UIBarButtonItem instances in your application by default, then you can use the new UIAppearance API to do just that:
[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];