我UITabBar在 iPhone 和 iPad 应用程序中使用 a，但是当我进入横向模式时，自动调整大小在 iPad 上不起作用（它在 iPhone 上工作正常）。
{
tabBarController =[[UITabBarController alloc]init];
tabBarController.delegate=self;
self.tabBarController.viewControllers = [NSArray arrayWithObjects:navController1,navController2, navController3,navController4,navController5,nil];
tabBarController.selectedViewController = navController1;
imgTab = [[UIImageView alloc]initWithFrame:CGRectMake(0,0,768.0,51)];
[imgTab setAutoresizingMask: UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin]; imgTab.image=[UIImage imageNamed:@"footerbg.jpg"];
[tabBarController.tabBar addSubview:imgTab];
accountImg=[[UIImageView alloc]initWithFrame:CGRectMake(150.0,5.0,29.0,29.0)];
[accountImg setAutoresizingMask: UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin];
accountImg.image=[UIImage imageNamed:@"click11.png"];
UITabBarItem *tabItem = [[[tabBarController tabBar] items] objectAtIndex:0];
[tabItem setTitle:@"Task"];
[imgTab addSubview:accountImg];
staffImg=[[UIImageView alloc]initWithFrame:CGRectMake(255,5.0,29.0,29.0)];
staffImg.image=[UIImage imageNamed:@"spreadsheet11-1.png"];
UITabBarItem *tabItem1 = [[[tabBarController tabBar] items] objectAtIndex:1];
[tabItem1 setTitle:@"SpreadSheet"];
[staffImg setAutoresizingMask: UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin];
[imgTab addSubview:staffImg];
taskImg=[[UIImageView alloc]initWithFrame:CGRectMake(370.0,5.0,29.0,29.0)];
taskImg.image=[UIImage imageNamed:@"calendar2.png"];
UITabBarItem *tabItem2 = [[[tabBarController tabBar] items] objectAtIndex:2];
[tabItem2 setTitle:@"Calendar"];
[taskImg setAutoresizingMask: UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin];
[imgTab addSubview:taskImg];
spreadImg =[[UIImageView alloc]initWithFrame:CGRectMake(472.0,5.0,29.0,29.0)];
spreadImg.image=[UIImage imageNamed:@"message22.png"];
UITabBarItem *tabItem3 = [[[tabBarController tabBar] items] objectAtIndex:3];
[tabItem3 setTitle:@"Message"];
[spreadImg setAutoresizingMask: UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin];
[imgTab addSubview:spreadImg];
}