iOS UITabBarController中设置字体颜色及大小

1.正常状态下（还可以设置选中状态下的颜色）

[[UITabBarItem
appearance]setTitleTextAttributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:10],NSForegroundColorAttributeName:[UIColor
whiteColor]} forState:UIControlStateNormal];

[[UITabBarItem
appearance]setTitleTextAttributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:10],NSForegroundColorAttributeName:[UIColor
blackColor]}
forState:UIControlStateSelected];

2.iOS9.0之前的，现在已经废用

[[UITabBarItem
appearance] setTitleTextAttributes:[NSDictionary
dictionaryWithObjectsAndKeys:

[UIColor
whiteColor], UITextAttributeTextColor,

nil] forState:UIControlStateNormal];

UIColor *titleHighlightedColor = [UIColor
blackColor];

[[UITabBarItem
appearance] setTitleTextAttributes:[NSDictionary
dictionaryWithObjectsAndKeys:

titleHighlightedColor,
UITextAttributeTextColor,

nil] forState:UIControlStateSelected];