UITabBar

UITabBar即选项卡，使用它比较简单，主要是创建UITabBarItem，然后添加到UITabBar的items里。

1、UITabBar的创建

UITabBar *tabBar = [[UITabBaralloc]initWithFrame:CGRectMake(0,420, 320,60)];

2、创建UITabBarItem

有两种方法：

initWithTabBarSystemItem、initWithTitle

这里用initWithTabBarSystemItem作演示

UITabBarItem *tabBarItem01 = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemDownloadstag:1];

  UITabBarItem *tabBarItem02 = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemHistorytag:2];

    UITabBarItem *tabBarItem03 = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemContactstag:3];

   UITabBarItem *tabBarItem04 = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemMoretag:4];

系统的UITabBarItem的样式主要有以下几种：

typedef NS_ENUM(NSInteger, UITabBarSystemItem) {

    UITabBarSystemItemMore,

    UITabBarSystemItemFavorites,

    UITabBarSystemItemFeatured,

    UITabBarSystemItemTopRated,

    UITabBarSystemItemRecents,

    UITabBarSystemItemContacts,

    UITabBarSystemItemHistory,

    UITabBarSystemItemBookmarks,

    UITabBarSystemItemSearch,

    UITabBarSystemItemDownloads,

    UITabBarSystemItemMostRecent,

    UITabBarSystemItemMostViewed,

};

3、将UITabBarItems添加

NSMutableArray * tabBarItemArray = [NSMutableArrayarrayWithObjects:tabBarItem01,tabBarItem02,tabBarItem03,tabBarItem04,tabBarItem05,tabBarItem06,nil];

    [tabBar setItems:tabBarItemArrayanimated:YES];

4、设置UITabBar的属性

tabBar.tintColor = [UIColorredColor];

5、添加delegate，并实现delegate的方法

tabBar.delegate =self;

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item

{

    NSInteger tag = item.tag;

    NSString * tagString = [NSStringstringWithFormat:@"您选择了%d个tabBarItem",tag];

    UIAlertView * alertView = [[UIAlertViewalloc]initWithTitle:@"选择了tabBarItem"message:tagString delegate:selfcancelButtonTitle:@"取消"otherButtonTitles:@"确定",nil];

    [alertView show];

    NSLog(@"您选择的tag是：%d",tag);

}

详细demo见：https://github.com/tingxuan/TXUITabBarDemo