[UINavigationBar appearance] 如何设置标题的颜色？

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"bg_navigationBar_White.png"] forBarMetrics:UIBarMetricsDefault];

背景为白色，想设置title为黑色。

nasa_wang

[[UINavigationBar appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObject:[UIColor blackColor] forKey:UITextAttributeTextColor]];

dyzdyz010