简单实现自定义TabBar实现点击tabBarItem触发自定义事件

由于项目中的需求，所以要做自定义的tabBarController来实现点击tabBarItem实现分享和弹出自定义相机实现拍照，那么问题来了，系统自带的tabBarController只能实现页面的跳转，并且在点击tabBarItem时无法隐藏tabBar。那么只好自定义了，在网上查找了很多，发现都不符合自己的需求，所以就自己摸索出了一个，接下来上代码：

• 首先我们创建一个继承UITabBarController的类

-(void)viewDidLoad
{
    [super viewDidLoad];
    
    HomeVC *homeVC = [[HomeVC alloc] init];

    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:homeVC];

    UserVC *userVC = [[UserVC alloc] init];
    
    UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:userVC];
    
    CameraVC *cameraVC = [[CameraVC alloc] init];
    
    //删除原来的tabbar
    CGRect rect = self.tabBar.frame;
    
    [self.tabBar removeFromSuperview];  //移除TabBarController自带的下部的条
    
    //测试添加自己的视图
    _myView = [[UIView alloc] init];

    _myView.frame = rect;
    
    _myView.backgroundColor = [UIColor whiteColor];
    
    [self.view addSubview:_myView];
    
    //这里我只添加了三个controlelr，因为第四个item点击不出现视图，而是触发分享事件
    self.viewControllers = @[nav1,cameraVC,nav3];
    
    NSArray *norImgArr = @[@"home01",@"Camera01",@"urse01",@"share01"];
    
    NSArray *selImgArr = @[@"home02",@"Camera02",@"urse02",@"share02"];
    
    for (int i = 0; i < 4; i++)
    {
        _itemBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        
        float width = MainScreenBounds.size.width/4;
        
        _itemBtn.frame = CGRectMake(i*width+23, 0, 44, 44);
        
        [_itemBtn setBackgroundImage:[UIImage imageNamed:[norImgArr objectAtIndex:i]] forState:UIControlStateNormal];
        
        [_itemBtn setBackgroundImage:[UIImage imageNamed:[selImgArr objectAtIndex:i]] forState:UIControlStateSelected];
        
        _itemBtn.tag = i;
        
        [_itemBtn addTarget:self action:@selector(itemButtonClick:) forControlEvents:UIControlEventTouchUpInside];
        
        [_myView addSubview:_itemBtn];
        
        [self.btnArray addObject:_itemBtn];
    }
    
    //设置第一个button为选中状态
    ((UIButton *)[self.btnArray objectAtIndex:0]).selected = YES;
}

• 接下来是btn的点击事件

- (void)itemButtonClick:(UIButton *)btn
{
    self.selectedIndex = btn.tag;
    
    switch (btn.tag)
    {
        case 0:
        {

        }
            break;
        case 1:
        {
            NSLog(@"照相");
            
            //这里是点击相机的时候隐藏tabbar出现自定义相机界面
            _myView.hidden = YES;
        }
            break;
        case 2:
        {

        }
            break;
        case 3:
        {
            NSLog(@"分享");
            
            [self shareButtonClick];
        }
            break;
    
        default:
            break;
    }
    
    //点击其他button后第一个button改为非选中状态
    ((UIButton *)[self.btnArray objectAtIndex:0]).selected = NO;
    
    if (btn != _itemBtn)
    {
        _itemBtn.selected = NO;
        
        _itemBtn = btn;
    }
    
    _itemBtn.selected = YES;
}