iOS 自定义UITabBarController

1.创建UITabBarController

@implementation RootViewController{

    NSMutableArray *_allBtnArr; //按钮数据数组

}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    //隐藏系统tabBar
    self.tabBar.hidden = YES;
    [self initailData];
    [self createSubViews];
}
//初始化数据
- (void)initailData{
    _allBtnArr = [NSMutableArray array];
    NSDictionary *btn1Dic = [NSDictionary dictionaryWithObjectsAndKeys:@"首页0" , @"title", @"1.png" , @"image", nil];
    NSDictionary *btn2Dic = [NSDictionary dictionaryWithObjectsAndKeys:@"首页1" , @"title", @"1.png" , @"image", nil];
    NSDictionary *btn3Dic = [NSDictionary dictionaryWithObjectsAndKeys:@"首页2" , @"title", @"1.png" , @"image", nil];
    NSDictionary *btn4Dic = [NSDictionary dictionaryWithObjectsAndKeys:@"首页3" , @"title", @"1.png" , @"image", nil];
    [_allBtnArr addObject:btn1Dic];
    [_allBtnArr addObject:btn2Dic];
    [_allBtnArr addObject:btn3Dic];
    [_allBtnArr addObject:btn4Dic];
}
//初始化视图(添加按钮)
- (void)createSubViews{
//TabBar背景
    UIView *backgroundV = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 49, self.view.frame.size.width, 49)];
    backgroundV.backgroundColor = [UIColor purpleColor];
    [self.view addSubview:backgroundV];
//循环创建自定义按钮
    NSInteger i = 0;
    for (NSDictionary *dic in _allBtnArr) {
        RootUIButton *tabBarBtn = [[RootUIButton alloc] initWithTitle:[dic objectForKey:@"title"] WithImage:[UIImage imageNamed:[dic objectForKey:@"image"]] WithFrame:CGRectMake(backgroundV.frame.size.width / _allBtnArr.count * i, 0, backgroundV.frame.size.width / _allBtnArr.count, backgroundV.frame.size.height)];
        tabBarBtn.backgroundColor = [UIColor clearColor];
        tabBarBtn.tag = 1000 + i;
        [tabBarBtn addTarget:self action:@selector(changeViewController:) forControlEvents:UIControlEventTouchUpInside];
        [backgroundV addSubview:tabBarBtn];
        i++;
    }
}
//根据Tag值标记接下来的操作
- (void)changeViewController:(UIButton *)button{
    switch (button.tag) {
        case 1000:
            NSLog(@"0");
　　　　　　　self.selectedIndex = 0;
            break;
        case 1001:
            NSLog(@"1");
　　　　　　　self.selectedIndex = 1;
            break;
        case 1002:
            NSLog(@"2");
　　　　　　 self.selectedIndex = 2;
            break;
        case 1003:
            NSLog(@"3");
　　　　　　 self.selectedIndex = 3;
            break;
            
        default:
            break;
    }
}

2.创建UIButton

//自定义按钮初始化 标题 图片 尺寸
- (instancetype)initWithTitle:(NSString *)title WithImage:(UIImage *)image WithFrame:(CGRect)frame{
   self = [super initWithFrame:frame];
    if (self) {
        [self createSubViewsWithTitle:title WithImage:image];
    }
    return self;
}
- (void)createSubViewsWithTitle:(NSString *)title WithImage:(UIImage *)image{
    //创建按钮图片
    UIImageView *btnImageV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height - 20)];
    btnImageV.backgroundColor = [UIColor clearColor];
    btnImageV.image = image;
    btnImageV.contentMode = 1;
    [self addSubview:btnImageV];
    
    //创建按钮文字
    UILabel *titleLB = [[UILabel alloc] initWithFrame:CGRectMake(btnImageV.frame.origin.x, btnImageV.frame.origin.y + btnImageV.frame.size.height, btnImageV.frame.size.width, 20)];
    titleLB.backgroundColor = [UIColor cyanColor];
    titleLB.textAlignment = NSTextAlignmentCenter;
    titleLB.text = title;
    [self addSubview:titleLB];
    
}

3.在AppDelegate中使用自定义的UITabBarViewController

    ViewController *homeVC = [[ViewController alloc] init];
    TwoViewController *twoVC = [[TwoViewController alloc] init];
    ThreeViewController *threeVC = [[ThreeViewController alloc] init];
    FourViewController *foureVC = [[FourViewController alloc] init];
    RootViewController *rootTabBarVC = [[RootViewController alloc] init];
    rootTabBarVC.viewControllers = [NSArray arrayWithObjects:homeVC, twoVC, threeVC, foureVC, nil];
    self.window.rootViewController = rootTabBarVC;

效果图: