今天写了个二级联动，并且可以弹出一个可拖拽的视图，允许拖拽标题，拖拽完成自动交换布局，而且标题宽度自动适配，允许标题宽度不一致，添加随着滚动颜色渐变，文字大小渐变，下划线大小位置渐变效果，样式可以选择下划线和栅栏效果，直接上效果图

• 效果1

  
  1.gif

• 效果2

  
  2.gif

• 效果3

  
  3.gif

而且使用简单

但是因为其中涉及到拖拽排序，所有标题数组希望是一个模型
你可以自定义一个模型，只需要继承自SegmentTitleModel就行，里面的title就是标题栏标题
代码如下

- (void)setSegmentView:(YWSegementStyle)segementStyle YWSegementIndicateStyle:(YWSegementIndicateStyle)segementIndicateStyle  isShowSelectView:(BOOL)isShowSelectView{
    NSMutableArray *mutArr = [NSMutableArray array];
    NSMutableArray *titleArr = [NSMutableArray array];
    NSArray *titles = @[@"精选",@"2018世界杯",@"明日之子",@"电影",@"电视剧",@"NBA",@"花样年华"];
    for (int i = 0; i < 7; i++) {
        YWDetailViewController *tabVC = [YWDetailViewController new];
        tabVC.title = titles[i];
        [mutArr addObject:tabVC];
        
        SegmentTitleModel *model = [[SegmentTitleModel alloc]init];
        model.title = titles[i];
        [titleArr addObject:model];
    }
    YWSegmentView *segmentView = [[YWSegmentView alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(self.navigationController.navigationBar.frame), self.view.bounds.size.width, [UIScreen mainScreen].bounds.size.height - CGRectGetMaxY(self.navigationController.navigationBar.frame)) ViewControllersArr:[mutArr copy] TitleArr:titleArr TitleNormalSize:16 TitleSelectedSize:20 SegmentStyle:segementStyle ParentViewController:self ReturnIndexBlock:^(NSInteger index) {
        NSLog(@"点击了%ld模块",(long)index);
    }];
    segmentView.yw_indicateStyle = segementIndicateStyle;
    segmentView.isShowSelectView = isShowSelectView;
    segmentView.isShowTitleBottomView = YES;
    [self.view addSubview:segmentView];
}

感兴趣的可以看一下Demo