自定义标签工具栏 Tabbar

简单介绍一下在三级控制器中标签控制器的自定义标签工具栏。

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    _window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];    _window.backgroundColor = [UIColor whiteColor];    [_window makeKeyAndVisible];    MainTabbarController *mainCtrl = [[[MainTabbarController alloc] init] autorelease];    _window.rootViewController = mainCtrl;    return YES;}

MainTabbarController.h

@interface MainTabbarController : UITabBarController{    UIImageView *_selectedImg;    UIView *tabbarView;}

MainTabbarController.m
（1）创建三级控制器

@implementation MainTabbarController- (void)viewDidLoad {    [super viewDidLoad];    //1.创建三级控制器    [self _initViewCtrls];    //2.使用第三种自定义工具栏的方法    [self _newInitTabbar];}//1.创建视图控制器- (void)_initViewCtrls {    //(1)创建视图控制器，最多只能显示5个    ProfileViewController *profileCtrl = [[[ProfileViewController alloc] init] autorelease];    GroupViewController *groupCtrl = [[[GroupViewController alloc] init] autorelease];    SearchViewController *searchCtrl = [[[SearchViewController alloc] init] autorelease];    CommentViewController *commentCtrl = [[[CommentViewController alloc] init] autorelease];    MessageViewController *messageCtrl = [[[MessageViewController alloc] init] autorelease];    //将视图控制器存放到数组中    NSArray *viewCtrls = @[profileCtrl,groupCtrl,searchCtrl,commentCtrl,messageCtrl];    //(2)创建导航控制器，并且将视图控制器交给导航控制器管理    NSMutableArray *navCtrls = [[NSMutableArray alloc] init];    for(int i=0; i<5 ; i++) {        //取得视图控制器        UIViewController *viewCtrl = viewCtrls[i];        //创建导航控制器        UINavigationController *navCtrl = [[UINavigationController alloc] initWithRootViewController:viewCtrl];        [navCtrl.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar_bg_normal"] forBarMetrics:UIBarMetricsDefault];        [navCtrls addObject:navCtrl];    }    //**(3)创建标签控制器**    self.viewControllers = navCtrls;}

（2）使用第三种自定义工具栏的方法

- (void)_newInitTabbar {    //(1)移除工具栏上的按钮    //取得tabbar上的所有子视图    NSArray *views = [self.tabBar subviews];    for (UIView *view in views) {        [view removeFromSuperview];    }    //(2)设置背景    self.tabBar.backgroundImage = [UIImage imageNamed:@"navbg"];    //(3)创建按钮    CGFloat width = [UIScreen mainScreen].bounds.size.width;    //每一个按钮的宽度    CGFloat w =  width/5;    for (int i=0; i<5; i++) {        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];        NSString *imageName = [NSString stringWithFormat:@"%d",i+1];        [button setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];        //设置frame        button.frame = CGRectMake((w-42)/2+w*i, 2, 42, 45);        //添加一个点击事件        [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];        [self.tabBar addSubview:button];    }    //(4)创建选中图片    _selectedImg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"选中"]];    _selectedImg.frame = CGRectMake((w-53)/2.0, 2, 53, 45);    [self.tabBar addSubview:_selectedImg];}

（3）按钮的点击事件

- (void)buttonAction:(UIButton *)button {    //切换视图控制器    self.selectedIndex = button.tag;    //动画方法一：    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:.2];     _selectedImg.center = button.center;    [UIView commitAnimations];   //动画方法二（block）：     [UIView animateWithDuration:.2 animations:^{        _selecteImgView.center = button.center;    } completion:^(BOOL finished) {        NSLog(@"动画完成");    }];}

如果想实现一个控制器（ProfileViewController）PUSH到下一个控制器（DetailViewController）后不显示标签工具栏，则用如下方法：
（1）首先先在ProfileViewController中添加一个按钮和点击事件：

ProfileViewController.m

- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor redColor];    //添加子视图    UIButton *button = [UIButton buttonWithType:UIButtonTypeContactAdd];    button.frame = CGRectMake(90, 90, 90, 50);    [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];}- (void)buttonAction {    DetailViewController *detailCtrl = [[DetailViewController alloc] init];    [self.navigationController pushViewController:detailCtrl animated:YES];    [detailCtrl release];}

（2） DetailViewController.m

- (instancetype)init{    self = [super init];    if (self) {        ***//注意这行代码放的位置（被push的视图控制器中）***        self.hidesBottomBarWhenPushed = YES;    }    return self;}

效果图如下：