UITabbar改变灰色背景图片和背景颜色

UITabBarController *tab=[[UITabBarController alloc]init];

UITabBarItem *item = [tab.tabBar.items objectAtIndex:0];

[item setFinishedSelectedImage:[UIImage imageNamed:@"11.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"11.png"]];

tab.tabBar.barTintColor=[UIColor redColor];//背景颜色为红色

tab.tabBar.tintColor=[UIColor yellowColor]; //字体和图片边框为黄色

self.hidesBottomBarWhenPushed=YES;//隐藏tabBar当push进得时候

self.tabBar.hide=YES; //自定义的时候把原来的隐藏