控制导航栏button的显示与隐藏

需求: 控制导航栏左右按钮在不同状态下显示与隐藏

一.声明rightBtn

@property(nonatomic,strong)UIButton *rightBtn;//右导航按钮

二.初始化rightBtn 设置为导航栏rightBarButtonItem

#pragma makr - 初始化导航栏右按钮
-(void)makeNav
{
    _rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    _rightBtn.frame = CGRectMake(0, 0, 40, 30);
    [_rightBtn setTitle:@"点我" forState:UIControlStateNormal];
    [_rightBtn addTarget:self action:@selector(rightButtonClick) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:_rightBtn];
}

#pragma makr - 导航栏右按钮点击事件
-(void)rightButtonClick
{
    NSLog(@"导航栏右按钮");
}

三.控制rightBtn显示与隐藏 本文用的是segment点击事件

#pragma mark - segment点击事件
-(void)segmentClick:(UISegmentedControl*)segment
{
    switch (segment.selectedSegmentIndex)
    {
        case 0:
        {
            _rightBtn.hidden = NO;
        }
            break;
        case 1:
        {
            _rightBtn.hidden = YES;
        }
            break;
        default:
            break;
    }
}

左按钮同理