IOS 5 如何更改导航栏中后退按钮的颜色？

I want to change the color of back button of a navigation bar to make it look like this

Set the backBarButtonItem's tintColor:

self.navigationItem.backBarButtonItem.tintColor = [UIColor redColor];

TIP：如果您希望将其应用于all UIBarButtonItem默认情况下，您的应用程序中存在实例，然后您可以使用新的UIAppearanceAPI 来做到这一点：

[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];