我正在尝试使用UIAppearance更改我的应用中导航栏的颜色。但只有当我使用系统颜色时，它才有效:UINavigationBar*navigationBarAppearance=[UINavigationBarappearance];[navigationBarAppearancesetBarTintColor:[[UIColoralloc]initWithRed:220.0fgreen:47.0fblue:40.0falpha:100.0f]];//doesnotwork[navigationBarAppearancesetBarTintColor:[UIColorcolorWi