一个类似腾讯新闻的分页控制器

先看效果图：

ScreenCaptureProject3.gif
demo.gif

分页控制器分两部分，
一是分页控制器，标题联动，分为内容页和导航标题视图，通过点击和滚动来同步状态。

#pragma mark - delegate
#pragma mark - 导航分类选择代理 点击标题滚动到相应的界面
- (void)XSNavChooseView:(XSNavCouseChoseView *)chooseView clickItem:(id)itemModel withIndex:(NSInteger)index {
    
    CGFloat offsetX = index *self.view.frame.size.width;
    [_backScrollView setContentOffset:CGPointMake(offsetX,0)animated:NO];
    [self addChildVCWithIndex: index];

}

#pragma mark - ScroollView Delegate 拖动结束同步标题状态
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    
    if (![scrollView isKindOfClass:[UITableView class] ]) {
        CGPoint offset = scrollView.contentOffset;
        _navCoureCategoryView.currentBtnIndex = offset.x/self.view.frame.size.width;
        
        NSInteger index  = offset.x/self.view.frame.size.width;
        [self addChildVCWithIndex: index];
   }
}

所有的子控制器都是作为首页的自控制器，并在界面显示时候加载出来，支持标题的增减，不过至少保留一个首页

标题改变时候只改变导航标题
- (void)setNavTitleAry:(NSMutableArray *)navTitleAry {
 
    _navTitleAry = navTitleAry;
    self.navCoureCategoryView.modelAry = navTitleAry;
    self.backScrollView.contentSize = CGSizeMake(self.view.frame.size.width * _navTitleAry.count, _backScrollView.frame.size.height);
    [_backScrollView setContentOffset:CGPointMake(0,0)animated:NO];

    // 导航栏数据变化移除子控制器
   [self.childViewControllers enumerateObjectsUsingBlock:^(__kindof UIViewController * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
       if (![obj isKindOfClass:[XSRecommendVC class]]) {
           //[self removeChild:obj];
           [obj removeFromParentViewController];
       }
   }];
}

只有视图显示，滚动或者点击标题才添加到首页
- (void)addChildVCWithIndex:(NSInteger )index {
    __block BOOL ishasVC = NO;
    [self.childViewControllers enumerateObjectsUsingBlock:^(__kindof UIViewController * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        
        if ([obj.title isEqualToString:_navTitleAry[index]]) {
            ishasVC = YES;
        }
    }];
    // 判断是否存在自控制器， 没有添加
    if (ishasVC == YES) {
        return;
    }
    NSString *titleName = _navTitleAry[index];
    XSCourseCategoryVC  *courseVC = [[XSCourseCategoryVC alloc] init];
    courseVC.view.frame = CGRectMake(self.view.frame.size.width * index, 0, self.view.frame.size.width, _backScrollView.frame.size.height);
    [_backScrollView addSubview:courseVC.view];
    courseVC.title = titleName;
    [self addChildViewController:courseVC];
}

二是分类选择器，支持collectionView的增删，拖动排序，原样是一个仿腾讯新闻的频道选择器，我在原来的基础上满足需求做了修改，原作者做了详细的说明，具体的请链接到：http://blog.csdn.net/u013282507/article/details/54374952

// 科目选择器
- (void)pushToChooseCourseCategoryVC {
    typeof(self) weakSelf = self;
    [[XLChannelControl shareControl] showChannelViewWithInUseTitles:_navTitleAry unUseTitles:_unUserTitleAry finish:^(NSArray *inUseTitles, NSArray *unUseTitles, NSString *title, BOOL isChange) {
        
        if (isChange) {
            weakSelf.navTitleAry = inUseTitles.mutableCopy;
            weakSelf.unUserTitleAry = unUseTitles.mutableCopy;
        }
        
        if (title) {
            // 点击 相应标题跳转到指定界面
            [weakSelf.navTitleAry enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                if ([title isEqualToString:obj]) {
                    
                    [self addChildVCWithIndex:idx];
                    
                    weakSelf.navCoureCategoryView.currentBtnIndex = idx;
                    CGFloat offsetX = idx *weakSelf.view.frame.size.width;
                    [weakSelf.backScrollView setContentOffset:CGPointMake(offsetX,0)animated:NO];

                }
            }];
        }
    }];
}

Jietu20171018-232022@2x.jpg
Jietu20171018-232056@2x.jpg

GitHub地址：https://github.com/396987177/pageController.git