看到这个控件，这到底是什么呢？其实现在主流的APP中几乎都选用了这个控件来作为模块划分的依据，就像QQ，QQ空间，微信，微博之类的APP，下面都有一个选项卡之类的控件，这就是Tabbar。tabbar就跟UINavigationController一样都是容器类，来看看效果：
这就是Tabbar的效果了，来看看是怎样实现的
AViewController *a = [[AViewController alloc] init];
// 设置tabbar的元素
UITabBarItem *itemA = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemHistory tag:1];
a.tabBarItem = itemA;
BViewController *b = [[BViewController alloc] init];
UITabBarItem *itemB = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemBookmarks tag:2];
b.tabBarItem = itemB;
CViewController *c = [[CViewController alloc] init];
UITabBarItem *itemC = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemSearch tag:3];
c.tabBarItem = itemC;
DViewController *d = [[DViewController alloc] init];
UITabBarItem *itemD = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemMostRecent tag:4];
d.tabBarItem = itemD;
DViewController *d1 = [[DViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:d1];
UITabBarItem *itemD1 = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:5];
nav.tabBarItem = itemD1;
// 容器类
UITabBarController *tabBar = [[UITabBarController alloc] init];
// 设置所有的视图控制器
tabBar.viewControllers = @[a,b,c,d,nav];
// 设置选中的索引值 当前显示的viewcontroller
// 默认选择第0个视图控制器
tabBar.selectedIndex = 2;
self.window.rootViewController = tabBar;
以上是使用系统自己的tabbar，使用起来还是很简单的，下面我们说一下真正常用的tarbar，我们看到的APP它们的tabbar都是不一样的，那肯定不是系统的啊，就必须需要我们自己定义了，下面展示一个自定义的tabbar。
这就是效果，其实实现还是很简单的，来看代码:
注意：这个自定义的tabbar肯定是要继承系统的tarbar的！
@interface MyTabBarController (){
UIImageView *_tabBarBackgroundImageView;
int maxBtnTag;
}
- (void)showTabBar;
- (void)hiddenTabBar;
@end
@implementation MyTabBarController
- (void)viewDidLoad {
[super viewDidLoad];
AViewController *homeVC = [[AViewController alloc] init];
UINavigationController *homeNav = [[UINavigationController alloc] initWithRootViewController:homeVC];
BViewController *signVC = [[BViewController alloc] init];
UINavigationController *signNav = [[UINavigationController alloc] initWithRootViewController:signVC];
CViewController *classVC = [[CViewController alloc] init];
UINavigationController *classNav = [[UINavigationController alloc] initWithRootViewController:classVC];
DViewController *shopVC = [[DViewController alloc] init];
UINavigationController *shopNav = [[UINavigationController alloc] initWithRootViewController:shopVC];
AViewController *mineVC = [[AViewController alloc] init];
UINavigationController *mineNav = [[UINavigationController alloc] initWithRootViewController:mineVC];
// 调用这个viewControllers
NSArray *navArray = @[homeNav,signNav,classNav,shopNav,mineNav];
[self setViewControllers:navArray animated:YES];
// self.viewControllers = navArray
// 添加自定义按钮
[self myTabBar];
}
- (void)myTabBar
{
// 创建背景图片
_tabBarBackgroundImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 480-49, 320, 49)];
// 指定自定义图片
_tabBarBackgroundImageView.image = [UIImage imageNamed:@"tabBarBackground"];
_tabBarBackgroundImageView.userInteractionEnabled = YES;
[self.view addSubview:_tabBarBackgroundImageView];
NSArray *arr = @[@"home",@"sign",@"class",@"shop",@"main"];
int intervalX = 320/5;
for (int i = 0; i < 5; i++) {
UIImageView *titleImage = [[UIImageView alloc] init];
UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(10+intervalX*i, 26, 64, 30)];
lab.text = [arr objectAtIndex:i];
lab.textColor = [UIColor colorWithRed:0.4 green:0.3 blue:0.8 alpha:1];
[_tabBarBackgroundImageView addSubview:lab];
// 设置tabbar上图标的位置
titleImage.frame = CGRectMake(20+intervalX*i, 5, 20, 20);
titleImage.tag = i+11;
if (i==0) {
[titleImage setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d",i+1]]];
}
else
{
[titleImage setImage:[UIImage imageNamed:[NSString stringWithFormat:@"unH%d",i+1]]];
}
[_tabBarBackgroundImageView addSubview:titleImage];
}
// 创建按钮
// int intervalX = 320/5;
// for (int i = 0; i < 5; i++) {
// UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
// btn.frame = CGRectMake(20+intervalX*i, 5, 20, 20);
// btn.tag = i+1;
//
// if (i==0) {
// [btn setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d",i+1]] forState:UIControlStateNormal];
// }
// else
// {
// [btn setImage:[UIImage imageNamed:[NSString stringWithFormat:@"unH%d",i+1]] forState:UIControlStateNormal];
//
// }
//
// [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
// [_tabBarBackgroundImageView addSubview:btn];
//
//
// }
for (int i = 0; i < 5; i++) {
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(intervalX*i, 0, intervalX , 49);
btn.tag = i+1;
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[_tabBarBackgroundImageView addSubview:btn];
}
}
static NSInteger selectBtn = 1;
- (void)btnClick:(UIButton *)button
{
// 视图的切换
self.selectedIndex = button.tag-1;
// 如果选中和当前的相同的话返回
if (selectBtn == button.tag) {
return;
}
UIImageView *btn1 = (UIImageView *)[self.view viewWithTag:button.tag + 10];
[btn1 setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%ld",button.tag]] ];
// 找到上一个按钮 并且让按钮的高亮状态变成非高亮
UIImageView *btn = (UIImageView *)[self.view viewWithTag:selectBtn + 10];
[btn setImage:[UIImage imageNamed:[NSString stringWithFormat:@"unH%ld",(long)selectBtn]] ];
// 记录上一个按钮的值
selectBtn = button.tag;
// self.selectedIndex = button.tag-1;
//
//// 如果选中和当前的相同的话返回
// if (selectBtn == button.tag) {
// return;
// }
// [button setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d",button.tag]] forState:UIControlStateNormal];
//
//// 找到上一个按钮 并且让按钮的高亮状态变成非高亮
// UIButton *btn = (UIButton *)[self.view viewWithTag:selectBtn];
// [btn setImage:[UIImage imageNamed:[NSString stringWithFormat:@"unH%d",selectBtn]] forState:UIControlStateNormal];
//// 记录上一个按钮的值
// selectBtn = button.tag;
}
//
- (void)showTabBar{
_tabBarBackgroundImageView.hidden = NO;
}
- (void)hiddenTabBar{
_tabBarBackgroundImageView.hidden = YES;
}
当然了，以上只是一个很简单的自定义 tabbar，如果真正想用到开发中的自定义tabbar 可以参考代码请查看 这里