【iOS开发】---- UITabBarController的使用详解

//第一个控制器
MyViewController *myVC = [[MyViewController alloc] init];
UITabBarItem *firstItem = [[UITabBarItem alloc] initWithTitle:@"First" image:nil tag:1];
//自定义样式
[firstItem setFinishedSelectedImage:[UIImage imageNamed:@"home_o.png"]
withFinishedUnselectedImage:[UIImage imageNamed:@"home.png"]];
myVC.tabBarItem = firstItem;
[firstItem release];

//第二个控制器（带导航的）
SecViewController *secVC = [[SecViewController alloc] init];
secVC.navigationItem.title = @"Second View";

//注意此处与第一个tabBarItem不同,是系统样式，系统提供了很多可供选择的样式
UITabBarItem *secItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemHistory
tag:2];
//UITabBarItem右上角的数字标识
secItem.badgeValue = @"3";

secVC.tabBarItem = secItem;
[secItem release];

//将第二个控制器放在导航控制器中
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:secVC];

tabBarController = [[UITabBarController alloc] init];
tabBarController.viewControllers = [NSArray arrayWithObjects:myVC,nav, nil];
//默认设置选中第二个控制器（从左到右计数：0，1，2...）
[tabBarController setSelectedIndex:1];
tabBarController.delegate = self;
[nav release];
[myVC release];
self.window.rootViewController = tabBarController;

- (void)makeTabBarHidden:(BOOL)hide
{
if ( [self.tabBarController.view.subviews count] < 2 )
{
return;
}
UIView *contentView;

if ( [[self.tabBarController.view.subviews objectAtIndex:0] isKindOfClass:[UITabBar class]] )
{
contentView = [self.tabBarController.view.subviews objectAtIndex:1];
}
else
{
contentView = [self.tabBarController.view.subviews objectAtIndex:0];
}
//    [UIView beginAnimations:@"TabbarHide" context:nil];
if ( hide )
{
contentView.frame = self.tabBarController.view.bounds;
}
else
{
contentView.frame = CGRectMake(self.tabBarController.view.bounds.origin.x,
self.tabBarController.view.bounds.origin.y,
self.tabBarController.view.bounds.size.width,
self.tabBarController.view.bounds.size.height - self.tabBarController.tabBar.frame.size.height);
}
self.tabBarController.tabBar.hidden = hide;
}