在 Xcode 4.2 中出现不起作用

Question

我在didFinishLaunchingWithOptions方法的AppDelegate中添加了这段代码：

[[UINavigationBar appearance]setBackgroundColor:[UIColor colorWithRed:221/256.0 green:36/256.0 blue:40/256.0 alpha:0.0]];
[[UITabBar appearance] setBackgroundColor:[UIColor colorWithRed:221/256.0 green:36/256.0 blue:40/256.0 alpha:0.0]];

但是NavigationBar和TabBar并没有改变它们的颜色。我做错了什么？感谢

Answer 1

使用setTintColor:而不是setBackgroundColor:

[[UINavigationBar appearance] setTintColor:[UIColor colorWithRed:221/256.0 green:36/256.0 blue:40/256.0 alpha:0.0]];
[[UITabBar appearance] setTintColor:[UIColor colorWithRed:221/256.0 green:36/256.0 blue:40/256.0 alpha:0.0]];