需求: 控制導航欄左右按鈕在不同狀態(tài)下顯示與隱藏

一.聲明rightBtn

@property(nonatomic,strong)UIButton *rightBtn;//右導航按鈕

二.初始化rightBtn 設置為導航欄rightBarButtonItem

#pragma makr - 初始化導航欄右按鈕
-(void)makeNav
{
    _rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    _rightBtn.frame = CGRectMake(0, 0, 40, 30);
    [_rightBtn setTitle:@"點我" forState:UIControlStateNormal];
    [_rightBtn addTarget:self action:@selector(rightButtonClick) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:_rightBtn];
}

#pragma makr - 導航欄右按鈕點擊事件
-(void)rightButtonClick
{
    NSLog(@"導航欄右按鈕");
}

三.控制rightBtn顯示與隱藏 本文用的是segment點擊事件

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

左按鈕同理