【iOS】设置导航栏文字颜色，字体，左右Item文字颜色，字体

//left、right-item color【左右item的颜色】   
 [[UIBarButtonItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:15], NSFontAttributeName,[UIColor colorWithHexString:@"#333333"],NSForegroundColorAttributeName,nil] forState:UIControlStateNormal];  

 [[UIBarButtonItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:15], NSFontAttributeName,[[UIColor colorWithHexString:@"#333333"] colorWithAlphaComponent:0.5],NSForegroundColorAttributeName,nil] forState:UIControlStateHighlighted];      

//title颜色 Attributes 可以包含字体颜色和大小以及字体样式【中间Title字体】    
 [[UINavigationBar appearance] setTitleTextAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:17],NSForegroundColorAttributeName:kColorNavigationBarTint}];        


//NavigationBar backgroundcolor【背景色】   
 [[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]];