iOS 开发之 菜单栏UITabBarController

1、菜单栏 ： UITabBarController 提供选择进入哪一个页面 ，也属于UIViewControl
通过一个数组，里面存放的是视图控制器
2、初始化菜单栏 通过改变轨道的颜色，来改变按钮的颜色
UITabBarController *tabBarController = [[UITabBarController alloc]init];
tabBarController.view.tintColor = [UIColor blackColor];
3、显示3个菜单栏
tabBarController.viewControllers = @[@“grupe”,@“news”,@“userInfo”];
NSArray *title = @[@“圈子”,@“新闻”,@“个人中心”];
for(int i =0, i <3 , i ++){
UITabBarItem *allItem = tabBarController.tabBar.items[i];
allItem.title = title[i];
allItem.image = [UIImage imageName:title[i]];
}
tabBarController.selectedIndex = 0;//默认选项
self.window.rootViewController = tabBarController;
4、带导航控制器的菜单栏
1⃣️每初始化一个ViewController，就得初始化一个对应的导航控制器
ViewController *vc = [[ViewController alloc]init];
UINavigationController *nv = [[UINavigationController alloc]initWithRootViewCotroller:vc];
2⃣️菜单栏的所有视图是初始化的导航控制器，如
tabBarCotroller.viewControllers = @[nv,nv1,nv2];

代码如下：

<span style="font-size:14px;">self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

ViewController *grupe = [[ViewController alloc]init];
NewsViewController *news = [[NewsViewController alloc]init];
UserinfoViewController *userInfo = [[UserinfoViewController alloc]init];

UITabBarController *tabBarController = [[UITabBarController alloc]init];
//    通过改变tabBarController 的轨道的颜色，来改变 按钮的颜色
tabBarController.view.tintColor = [UIColor blackColor];

tabBarController.viewControllers = @[grupe,news,userInfo];

NSArray *title = @[@"圈子",@"新闻",@"个人中心"];
for (int i = 0; i<3; i++) {
UITabBarItem *allItem = tabBarController.tabBar.items[i];
allItem.title = title[i];
allItem.image = [UIImage imageNamed:title[i]];
}
tabBarController.selectedIndex = 1;//默认选项

self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];</span>