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iOS 仿豆瓣电影详情页嵌套滑动效果

作者：在线问答5 | 2024-07-04 15:35:45

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作者 | QuintGao 
来源 | 掘金，点击阅读原文查看作者更多文章

前言

之前写的GKPageScrollView https://github.com/QuintGao/GKPageScrollView 已经收获接近900个star，最近有时间对里面的GKPageSmoothView进行了优化升级，顺便实现了豆瓣电影详情页的效果，本文主要对GKPageSmoothView的实现做下简单介绍

先看下豆瓣电影的效果图

介绍

GKPageSmoothView与GKPageScrollView的实现原理不同
GKPageSmoothView主要是通过修改listScrollView的contentInset，然后添加headerView，并在滑动到一定程度的时候对headerView进行位置和布局的转换
GKPageScrollView主要是包含mainTableView和listScrollView，并在合适的位置处理滑动冲突

GKPageSmoothView支持以下功能：

  • 支持上下滑动、左右滑动、手势返回等

  • 支持顶部悬停、底部悬停

  • 支持底部悬停拖拽，可实现豆瓣电影详情页效果

  • 支持如JXCategoryView,JXSegmentedView等的分段控件

  • 可实现导航栏颜色渐变、头图下拉放大等效果

  • 支持主页下拉刷新、列表页上拉加载

实现

基本原理可以看这里UIScrollView嵌套滚动完美解决方案：仿淘宝、转转首页 下面主要讲讲底部悬停及底部拖拽的实现

底部悬停

底部悬停的实现跟顶部悬停的实现基本一样，前提是headerView的高度要高于屏幕的高度，这样当headerView下滑到可以悬浮的位置时将segmentedView添加到GKPageSmoothView上固定，不再跟随listScrollView滑动，下面看下主要代码

  1. // 滑动到临界位置，固定segmentedView
  2.  if (contentOffsetY < (self.headerContainerHeight - self.frame.size.height)) {
  3.      self.hoverType = GKPageSmoothHoverTypeBottom;
  4.      if (self.segmentedView.superview != self.bottomContainerView) {
  5.            self.bottomContainerView.hidden = NO;
  6.            CGRect frame = self.segmentedView.frame;
  7.            frame.origin.y = 0;
  8.            self.segmentedView.frame = frame;
  9.             [self.bottomContainerView addSubview:self.segmentedView];
  10.       }
  11. }else {
  12.       // 超过临界位置，segmentedView跟listScrollView一起滑动
  13.       if (self.segmentedView.superview != self.headerContainerView) {
  14.             self.bottomContainerView.hidden = YES;
  15.             CGRect frame = self.segmentedView.frame;
  16.             frame.origin.y = self.headerHeight;
  17.             self.segmentedView.frame = frame;
  18.             [self.headerContainerView addSubview:self.segmentedView];
  19.       }
  20. }

底部拖拽

通过观察豆瓣详情页发现，拖拽底部时segmentedView和listScrollView是一起滑动的，所以添加了bottomContainerView来处理，并添加拖拽手势，当拖拽bottomContainerView时，让headerContainerView保持固定不动，segmentedView和listScrollView根据bottomContainerView一起滑动，此时只需处理拖拽手势和listScrollView的滑动即可

1、开始拖拽时，处理headerContainerView和listCollectionView

  1. // 将headerContainerView添加到self
  2.     if (self.headerContainerView.superview != self) {
  3.         CGRect frame = self.headerContainerView.frame;
  4.         frame.origin.y = -(self.currentListScrollView.contentOffset.y + self.headerContainerHeight);
  5.         self.headerContainerView.frame = frame;
  6.         [self insertSubview:self.headerContainerView belowSubview:self.bottomContainerView];
  7.     }
  8.     
  9.     // 将listCollectionView添加到bottomContainerView
  10.     if (self.listCollectionView.superview != self.bottomContainerView) {
  11.         CGRect frame = self.listCollectionView.frame;
  12.         frame.origin.y = self.segmentedHeight;
  13.         frame.size.height = self.bottomContainerView.frame.size.height - self.segmentedHeight;
  14.         self.listCollectionView.frame = frame;
  15.         [self.bottomContainerView addSubview:self.listCollectionView];
  16.         self->_listCollectionView.headerContainerView = nil;
  17.         
  18.         // 记录当前列表的滑动位置
  19.         self.currentListPanBeganContentOffsetY = self.currentListScrollView.contentOffset.y;
  20.         
  21.         for (id<GKPageSmoothListViewDelegate> list in self.listDict.allValues) {
  22.             list.listScrollView.contentInset = UIEdgeInsetsZero;
  23.             list.listScrollView.contentOffset = CGPointZero;
  24.             
  25.             CGRect frame = list.listView.frame;
  26.             frame.size = self.listCollectionView.bounds.size;
  27.             list.listView.frame = frame;
  28.         }
  29.     }

2、结束拖拽时，如果没有到达顶部，恢复到初始位置

  1.     // headerContainerView添加到listHeader
  2.     UIView *listHeader = [self listHeaderForListScrollView:self.currentListScrollView];
  3.     if (self.headerContainerView.superview != listHeader) {
  4.         CGRect frame = self.headerContainerView.frame;
  5.         frame.origin.y = 0;
  6.         self.headerContainerView.frame = frame;
  7.         [listHeader addSubview:self.headerContainerView];
  8.     }
  9.     
  10.     // listCollectionView添加到self
  11.     if (self.listCollectionView.superview != self) {
  12.         self.listCollectionView.frame = self.bounds;
  13.         [self insertSubview:self.listCollectionView belowSubview:self.bottomContainerView];
  14.         self->_listCollectionView.headerContainerView = self.headerContainerView;
  15.         
  16.         for (id<GKPageSmoothListViewDelegate> list in self.listDict.allValues) {
  17.             list.listScrollView.contentInset = UIEdgeInsetsMake(self.headerContainerHeight, 0, 0, 0);
  18.             list.listScrollView.contentOffset = CGPointZero;
  19.             
  20.             CGRect frame = list.listView.frame;
  21.             frame.size = self.listCollectionView.bounds.size;
  22.             list.listView.frame = frame;
  23.         }
  24.         self.currentListScrollView.contentOffset = CGPointMake(0, self.currentListPanBeganContentOffsetY);
  25.     }

3、拖拽滑动处理

  1. - (void)handlePanGesture:(UIPanGestureRecognizer *)panGesture {
  2.     // 
  3.     if (panGesture.state == UIGestureRecognizerStateBegan) {
  4.         [self dragBegan];
  5.     }
  6.     
  7.     CGPoint translation = [panGesture translationInView:self.bottomContainerView];
  8.     if (self.isDragScrollView) {
  9.         [self allowScrolling:self.scrollView];
  10.         // 当UIScrollView在最顶部时，处理视图的滑动
  11.         if (self.scrollView.contentOffset.y <= 0) {
  12.             if (translation.y > 0) { // 向下拖拽
  13.                 [self forbidScrolling:self.scrollView];
  14.                 self.isDragScrollView = NO;
  15.                 
  16.                 CGRect frame = self.bottomContainerView.frame;
  17.                 frame.origin.y += translation.y;
  18.                 self.bottomContainerView.frame = frame;
  19.                 
  20.                 if (!self.isAllowDragScroll) {
  21.                     self.scrollView.panGestureRecognizer.enabled = NO;
  22.                     self.scrollView.panGestureRecognizer.enabled = YES;
  23.                 }
  24.             }
  25.         }
  26.     }else {
  27.         // 根据listScrollView的位置处理bottomContainerView的frame
  28.         CGFloat offsetY = self.scrollView.contentOffset.y;
  29.         CGFloat ceilPointY = self.ceilPointHeight;
  30.         
  31.         if (offsetY <= 0) {
  32.             [self forbidScrolling:self.scrollView];
  33.             if (translation.y > 0) { // 向下拖拽
  34.                 CGRect frame = self.bottomContainerView.frame;
  35.                 frame.origin.y += translation.y;
  36.                 self.bottomContainerView.frame = frame;
  37.             }else if (translation.y < 0 && self.bottomContainerView.frame.origin.y > ceilPointY) { // 向上拖拽
  38.                 CGRect frame = self.bottomContainerView.frame;
  39.                 frame.origin.y = MAX((self.bottomContainerView.frame.origin.y + translation.y), ceilPointY);
  40.                 self.bottomContainerView.frame = frame;
  41.             }
  42.         }else {
  43.             if (translation.y < 0 && self.bottomContainerView.frame.origin.y > ceilPointY) {
  44.                 CGRect frame = self.bottomContainerView.frame;
  45.                 frame.origin.y = MAX((self.bottomContainerView.frame.origin.y + translation.y), ceilPointY);
  46.                 self.bottomContainerView.frame = frame;
  47.             }
  48.             
  49.             if (self.bottomContainerView.frame.origin.y > ceilPointY) {
  50.                 [self forbidScrolling:self.scrollView];
  51.             }else {
  52.                 [self allowScrolling:self.scrollView];
  53.             }
  54.         }
  55.     }
  56.     
  57.     // 拖拽结束，判断上滑还是下滑并确定是滑动到顶部还是底部
  58.     if (panGesture.state == UIGestureRecognizerStateEnded) {
  59.         CGPoint velocity = [panGesture velocityInView:self.bottomContainerView];
  60.         if (velocity.y < 0) { // 上滑
  61.             if (fabs(self.lastTransitionY) > 5 && self.isDragScrollView == NO) {
  62.                 [self dragShowing];
  63.             }else {
  64.                 if (self.bottomContainerView.frame.origin.y > (self.ceilPointHeight + self.bottomContainerView.frame.size.height / 2)) {
  65.                     [self dragDismiss];
  66.                 }else {
  67.                     [self dragShowing];
  68.                 }
  69.             }
  70.         }else { // 下滑
  71.             if (fabs(self.lastTransitionY) > 5 && self.isDragScrollView == NO && !self.scrollView.isDecelerating) {
  72.                 [self dragDismiss];
  73.             }else {
  74.                 if (self.bottomContainerView.frame.origin.y > (self.ceilPointHeight + self.bottomContainerView.frame.size.height / 2)) {
  75.                     [self dragDismiss];
  76.                 }else {
  77.                     [self dragShowing];
  78.                 }
  79.             }
  80.         }
  81.         
  82.         [self allowScrolling:self.scrollView];
  83.         self.isDragScrollView = NO;
  84.         self.scrollView = nil;
  85.     }
  86.     
  87.     [panGesture setTranslation:CGPointZero inView:self.bottomContainerView];
  88.     self.lastTransitionY = translation.y;
  89. }

底部拖拽实现基本就这些了，当然还有很多细节，想了解的可以查看具体代码。

使用

1、初始化GKPageSmoothView

  1. self.smoothView = [[GKPageSmoothView alloc] initWithDataSource:self];
  2. [self.view addSubView:self.smoothView];

2、初始化headerView和segmentedView

  1. self.headerView = [UIView new];
  2. self.segmentedView = [JXCategoryView new];

实现GKPageSmoothViewDataSource代理方法

  1. #pragma mark - GKPageSmoothViewDataSource
  2. - (UIView *)headerViewInSmoothView:(GKPageSmoothView *)smoothView {
  3.     return self.headerView;
  4. }
  5.  
  6. - (UIView *)segmentedViewInSmoothView:(GKPageSmoothView *)smoothView {
  7.     return self.segmentedView;
  8. }
  9.  
  10. - (NSInteger)numberOfListsInSmoothView:(GKPageSmoothView *)smoothView {
  11.     return 2;
  12. }
  13.  
  14. - (id<GKPageSmoothListViewDelegate>)smoothView:(GKPageSmoothView *)smoothView initListAtIndex:(NSInteger)index {
  15.     GKDBListView *listView = [GKDBListView new];
  16.     return listView;
  17. }

列表实现GKPageSmoothListViewDelegate代理方法

  1. #pragma mark - GKPageSmoothListViewDelegate
  2. - (UIScrollView *)listScrollView {
  3.     return self.tableView;
  4. }
  5.  
  6. - (UIView *)listView {
  7.     return self;
  8. }

其他常用属性

顶部临界高度

self.smoothView.ceilPointHeight = NAVBAR_HEIGHT;

开启底部悬浮

self.smoothView.bottomHover = YES;

允许底部拖拽

self.smoothView.allowDragBottom = YES;

delegate常用方法代理

  1. self.smoothView.delegate = self;
  2.  
  3. /// 列表容器滑动代理
  4. /// @param smoothView smoothView
  5. /// @param scrollView containerScrollView
  6. - (void)smoothView:(GKPageSmoothView *)smoothView scrollViewDidScroll:(UIScrollView *)scrollView;
  7.  
  8. /// 当前列表滑动代理
  9. /// @param smoothView smoothView
  10. /// @param scrollView 当前的列表scrollView
  11. /// @param contentOffset 转换后的contentOffset
  12. - (void)smoothView:(GKPageSmoothView *)smoothView listScrollViewDidScroll:(UIScrollView *)scrollView contentOffset:(CGPoint)contentOffset;
  13.  
  14. /// 开始拖拽代理
  15. /// @param smoothView smoothView
  16. - (void)smoothViewDragBegan:(GKPageSmoothView *)smoothView;
  17.  
  18. /// 结束拖拽代理
  19. /// @param smoothView smoothView
  20. /// @param isOnTop 是否通过拖拽滑动到顶部
  21. - (void)smoothViewDragEnded:(GKPageSmoothView *)smoothView isOnTop:(BOOL)isOnTop;

结语

至此，GKPageSmoothView的介绍已经完成，如果你想了解更多可以查看源码GKPageSmoothView，如果您觉得还不错，可以点个star，您的支持是我最大的动力。

参考

[1]UIScrollView嵌套滚动完美解决方案：仿淘宝、转转首页 https://www.jianshu.com/p/7b1a3feba5a3
[2]iOS仿抖音—评论视图滑动消失 https://www.jianshu.com/p/8a1f174a91e5

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