iOS开发之多表视图滑动切换示例（仿"头条"客户端）---优化篇

 1 #pragma mark --初始化下方的TableViews
 2 -(void) initDownTables{
 3     
 4     for (int i = 0; i < 2; i ++) {
 5         
 6         UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectMake(i * _mViewFrame.size.width, 0, _mViewFrame.size.width, _mViewFrame.size.height - TOPHEIGHT)];
 7         tableView.delegate = self;
 8         tableView.dataSource = self;
 9         tableView.tag = i;
10         
11         [_scrollTableViews addObject:tableView];
12         [_scrollView addSubview:tableView];
13     }
14     
15 }

 1 #pragma mark --根据scrollView的滚动位置复用tableView，减少内存开支
 2 -(void) updateTableWithPageNumber: (NSUInteger) pageNumber{
 3     int tabviewTag = pageNumber % 2;
 4     
 5     CGRect tableNewFrame = CGRectMake(pageNumber * _mViewFrame.size.width, 0, _mViewFrame.size.width, _mViewFrame.size.height - TOPHEIGHT);
 6     
 7     UITableView *reuseTableView = _scrollTableViews[tabviewTag];
 8     reuseTableView.frame = tableNewFrame;
 9     [reuseTableView reloadData];
10 }

 1 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
 2 
 3 {
 4     if ([scrollView isEqual:_scrollView]) {
 5         _currentPage = _scrollView.contentOffset.x/_mViewFrame.size.width;
 6         
 7         _currentPage = _scrollView.contentOffset.x/_mViewFrame.size.width;
 8         
 9         //    UITableView *currentTable = _scrollTableViews[_currentPage];
10         //    [currentTable reloadData];
11         
12         [self updateTableWithPageNumber:_currentPage];
13 
14         return;
15     }
16     [self modifyTopScrollViewPositiong:scrollView];
17 }

 1 #pragma mark -- 实例化顶部的tab
 2 -(void) initTopTabs{
 3     CGFloat width = _mViewFrame.size.width / 6;
 4     
 5     if(self.tabCount <=6){
 6         width = _mViewFrame.size.width / self.tabCount;
 7     }
 8     
 9     _topMainView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, _mViewFrame.size.width, TOPHEIGHT)];
10     
11     _topScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, _mViewFrame.size.width, TOPHEIGHT)];
12     
13     _topScrollView.showsHorizontalScrollIndicator = NO;
14     
15     _topScrollView.showsVerticalScrollIndicator = YES;
16     
17     _topScrollView.bounces = NO;
18     
19     _topScrollView.delegate = self;
20     
21     if (_tabCount >= 6) {
22         _topScrollView.contentSize = CGSizeMake(width * _tabCount, TOPHEIGHT);
23 
24     } else {
25         _topScrollView.contentSize = CGSizeMake(_mViewFrame.size.width, TOPHEIGHT);
26     }
27     
28     
29     [self addSubview:_topMainView];
30     
31     [_topMainView addSubview:_topScrollView];
32     
33     
34     
35     for (int i = 0; i < _tabCount; i ++) {
36         
37         UIView *view = [[UIView alloc] initWithFrame:CGRectMake(i * width, 0, width, TOPHEIGHT)];
38         
39         view.backgroundColor = [UIColor lightGrayColor];
40         
41         if (i % 2) {
42             view.backgroundColor = [UIColor grayColor];
43         }
44         
45         UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, width, TOPHEIGHT)];
46         button.tag = i;
47         [button setTitle:[NSString stringWithFormat:@"按钮%d", i+1] forState:UIControlStateNormal];
48         [button addTarget:self action:@selector(tabButton:) forControlEvents:UIControlEventTouchUpInside];
49         [view addSubview:button];
50         
51         
52         [_topViews addObject:view];
53         [_topScrollView addSubview:view];
54     }
55 }