UINavigationController改变UINavigationBar导航条标题颜色和字体

iOS 5 以后 UINavigationController 可以 改变UINavigationBar导航条标题颜色和字体

[self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: 

 [UIColor colorWithRed:0 green:0.7 blue:0.8 alpha:1], UITextAttributeTextColor, 

 [UIColor colorWithRed:0 green:0.7 blue:0.8 alpha:1], UITextAttributeTextShadowColor, 

 [NSValue valueWithUIOffset:UIOffsetMake(0, 0)], UITextAttributeTextShadowOffset, 

 [UIFont fontWithName:@"Arial-Bold" size:0.0], UITextAttributeFont, 

 nil]];

其中 UITextAttributeTextColor和UITextAttributeFont 属性是文字颜色和字体