Ios tab Bar 使用方法

http://blog.sina.com.cn/s/blog_63578f140100w56m.html

UITabBar* tabBar = [[UITabBar alloc] initWithFrame:CGRectMake(40,0.0,240,30)];

[mainView addSubview:tabBar];

[tabBar release];

UITabBarItem *tabBarItem1 = [[UITabBarItem alloc] initWithTitle:@"排队人数" image:nil tag:0];

UITabBarItem * tabBarItem2 = [[UITabBarItem alloc] initWithTitle:@"人均" image:nil tag:1];

UITabBarItem * tabBarItem3 = [[UITabBarItem alloc] initWithTitle:@"距离" image:nil tag:2];

UITabBarItem * tabBarItem4 = [[UITabBarItem alloc] initWithTitle:@"好评" image:nil tag:3];

NSArray *tabBarItemArray = [[NSArray alloc] initWithObjects: tabBarItem1, tabBarItem2, tabBarItem3, tabBarItem4,nil];

[tabBar setItems: tabBarItemArray];

[tabBarItemArray release];

好像tabBar.backgroundColor = [UIColor blueColor];设置背景不起作用

alpha可以起作用