//初始化第一个页面
FOURViewController * four = [[FOURViewController alloc]init];
four.view.backgroundColor = [UIColor yellowColor];
//设置第一个页面的分栏标题
four.tabBarItem.title = @"four";
//设置第一个页面的图分栏图片
four.tabBarItem.image = [UIImage imageNamed:@"4"];
//
UINavigationController * theNav4 = [[UINavigationController alloc]initWithRootViewController:four];
//设置中导航条的背景颜色
theNav4.navigationBar.barTintColor = [UIColor redColor];
//将导航控制器与底部分栏控件相绑定
_tabBar.viewControllers = @[theNav1,theNav2,theNav3,theNav4];
self.window.rootViewController = _tabBar;
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