底部按鈕切換

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    
    
    _rightView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height - 60)];
    _rightView.backgroundColor = [UIColor blueColor];
    
    [_baseView addSubview:_rightView];
    
    _leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height - 60)];
    _leftView.backgroundColor = [UIColor greenColor];
    
    [_baseView addSubview:_leftView];
    
    
    
    // Do any additional setup after loading the view from its nib.
}

- (IBAction)didClicked:(id)sender {
    UIButton *button = (UIButton *)sender;
    NSInteger tag = button.tag - 100;
    switch (tag) {
        case 0:
        {
            [_baseView bringSubviewToFront:_leftView];
        }
            break;
        case 1:
        {
            [_baseView bringSubviewToFront:_rightView];
        }
            
            break;
            
        default:
            break;
    }
}