目录：
1、利用ViewController中间过渡
2、直接设置UITabBarController的数组
比较：相对来说第2中方式较方便，设置内容、标题等比较清晰明确，第1中方式中设置标题等内容时容易搞混，相对第2中方式没有较大的优势。
1、利用ViewController中间过渡
AppDelegate中代码设置
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
ViewController *vc = [[ViewController alloc] init];
self.window.rootViewController = vc;
return YES;
}
ViewController中代码设置
//初始化要使用的三个VC
FirstVc *first = [[FirstVc alloc] init];
SecondVc *second = [[SecondVc alloc] init];
ThirdVc *third = [[ThirdVc alloc] init];
//初始化三个nav
UINavigationController *firstNav = [[UINavigationController alloc] initWithRootViewController:first];
firstNav.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"111" image:nil tag:1];
UINavigationController *secondNav = [[UINavigationController alloc] initWithRootViewController:second];
secondNav.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"" image:nil tag:1];
UINavigationController *thirdNav = [[UINavigationController alloc] initWithRootViewController:third];
thirdNav.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"333" image:nil tag:1];
//初始化UITabBarController
self.tabBarCont = [[UITabBarController alloc] init];
self.tabBarCont.viewControllers = @[firstNav,secondNav,thirdNav];
self.tabBarCont.selectedIndex = 0;
self.tabBarCont.delegate = self;
self.tabBarCont.view.frame = self.view.frame;
[self.view addSubview:self.tabBarCont.view];
各个VC中的设置
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
}
- (void)viewWillAppear:(BOOL)animated
{
self.title = @"first";//此设置改变nav的标题和底部item的标题
self.navigationController.title = @"111";//item标题
}
2、直接设置UITabBarController的数组
AppDelegate中设置
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
//初始化
FirstVc *first = [[FirstVc alloc] init];
SecondVc *second = [[SecondVc alloc] init];
ThirdVc *third = [[ThirdVc alloc] init];
//创建标签栏控制器
tabBarControl = [UITabBarController new];
//放入标签栏中
tabBarControl.viewControllers = @[first,second,third];
//创建导航栏控制器，并指定他的根视图控制器
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:tabBarControl];
//添加中间的按钮
//缺点：1、按钮超过bottom的部分点击无响应 2、点击除按钮外的中间部分时也展示中间item的页面
//3个item是可能范围太大，如果调整item数量，缺点2应该影响不大。
UIButton *btn = [[UIButton alloc] init];
btn.backgroundColor = [UIColor redColor];
[btn setFrame:CGRectMake(130, -12, 60, 60)];
btn.clipsToBounds = YES;
btn.layer.cornerRadius = 30;
[btn addTarget:self action:@selector(clickCenterButton) forControlEvents:UIControlEventTouchUpInside];
[tabBarControl.tabBar addSubview:btn];
//指定应用的跟视图控制器
self.window.rootViewController = nav;
return YES;
}
各个VC中的设置
- (instancetype)init
{
self = [super init];
if (self)
{
self.title = @"111";//此处的title是item的标题
//设置图标的默认图片和选中后图片
self.tabBarItem.image = [[UIImage imageNamed:@"tabbar_mainframe@2x"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
self.tabBarItem.selectedImage = [[UIImage imageNamed:@"tabbar_mainframeHL@2x"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
//未读消息数量（右上角标识）
[self.tabBarItem setBadgeValue:@"18"];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
}
- (void)viewWillAppear:(BOOL)animated
{
self.tabBarController.navigationItem.title = @"first";//共同使用一个navigation，要在此方法中设置名称
//设置右边导航按钮
UIBarButtonItem *rightItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(tapAdd)];
self.tabBarController.navigationItem.rightBarButtonItem = rightItem;
}
- (void)tapAdd
{
//此处跳转页面操作
//或者弹出页面
}
