UITabBar

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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:tagStringdelegate: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

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