// 左边一个大分类，右边一个小分类的tableview，滚动小分类大分类会自动滚动，选中大分类，对应的小分类会自动变色
#define BigFlag @"big"
#define SmallFlag @"small"
#define SmallTableViewHeaderHeight 1.0f
- (void)makeTableView
{
CGFloat tableViewY = 30;
CGFloat screenWidth = self.view.frame.size.width;
CGFloat screenHeight = self.view.frame.size.height - tableViewY;
CGFloat bigRatio = 0.3;
self.bigTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, tableViewY, screenWidth*bigRatio, screenHeight) style:UITableViewStylePlain];
self.bigTableView.delegate = self;
self.bigTableView.dataSource = self;
self.bigTableView.showsVerticalScrollIndicator = NO;
[self.view addSubview:self.bigTableView];
self.smallTableView = [[UITableView alloc] initWithFrame:CGRectMake(screenWidth*bigRatio, tableViewY, screenWidth*(1- bigRatio), screenHeight) style:UITableViewStylePlain];
self.smallTableView.delegate = self;
self.smallTableView.dataSource = self;
self.smallTableView.showsVerticalScrollIndicator = NO;
[self.view addSubview:self.smallTableView];
self.datasource = [[NSMutableArray alloc] initWithCapacity:0];
for (int i = 0; i< arc4random_uniform(20) + 20; i++) {
NSMutableDictionary * bigdic = [NSMutableDictionary dictionaryWithCapacity:0];
[bigdic setObject:[NSString stringWithFormat:@"我是第%d组", i] forKey:BigFlag];
NSMutableArray *smallArr =[[NSMutableArray alloc] initWithCapacity:0];
for (int j = 0; j<arc4random_uniform(20) + 10; j++) {
[smallArr addObject:[NSString stringWithFormat:@"我是第%d组,第%d行",i, j]];
}
[bigdic setObject:smallArr forKey:SmallFlag];
[self.datasource addObject:bigdic];
}
[self.bigTableView reloadData];
[self.smallTableView reloadData];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
if (tableView == self.bigTableView) {
return 1;
}
return self.datasource.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (tableView == self.bigTableView) {
return self.datasource.count;
}
NSMutableDictionary *dic = self.datasource[section];
return [dic[SmallFlag] count];
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
if (self.bigTableView == tableView) {
return nil;
}
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.smallTableView.frame.size.width, SmallTableViewHeaderHeight)];
view.backgroundColor = [UIColor orangeColor];
return view;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (tableView == self.bigTableView) {
return 0.001;
}
return SmallTableViewHeaderHeight;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (tableView == self.bigTableView) {
UITableViewCell *cellBig = [tableView dequeueReusableCellWithIdentifier:BigFlag];
if (cellBig == nil) {
cellBig = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:BigFlag];
cellBig.textLabel.font = [UIFont systemFontOfSize:12];
}
cellBig.textLabel.textColor = [UIColor blackColor];
if (self.indexPath == nil) {
if (indexPath.row == 0) {
cellBig.textLabel.textColor = [UIColor orangeColor];
}
} else {
if (indexPath.row == self.indexPath.section) {
cellBig.textLabel.textColor = [UIColor orangeColor];
}
}
cellBig.textLabel.text = [[self.datasource objectAtIndex:indexPath.row] objectForKey:BigFlag];
return cellBig;
}
UITableViewCell *cellSmall = [tableView dequeueReusableCellWithIdentifier:SmallFlag];
if (cellSmall == nil) {
cellSmall = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SmallFlag];
}
cellSmall.textLabel.textColor = [UIColor blackColor];
if (self.indexPath == nil) {
if (indexPath.section == 0) {
cellSmall.textLabel.textColor = [UIColor orangeColor];
}
} else {
if (self.indexPath.section == indexPath.section) {
cellSmall.textLabel.textColor = [UIColor orangeColor];
}
}
cellSmall.textLabel.text = [[[self.datasource objectAtIndex:indexPath.section] objectForKey:SmallFlag] objectAtIndex:indexPath.row];
return cellSmall;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
if (self.smallTableView == tableView) {
return;
}
self.indexPath = [NSIndexPath indexPathForRow:0 inSection:indexPath.row]; // 转换为SmallTableView的indexPath
[self.smallTableView scrollToRowAtIndexPath:self.indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
[self.smallTableView reloadData];
[self.bigTableView reloadData];
}
#pragma mark - UIScrollViewDelegate Methods
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (self.bigTableView == scrollView) {
return;
}
UITableViewCell *cell = self.smallTableView.visibleCells[0];
NSIndexPath *indexPath = [self.smallTableView indexPathForCell:cell];
self.indexPath = indexPath;
// 判断拖拽过程中BigTableView的cell是否可见
BOOL isTop = [self.bigTableView.visibleCells containsObject:[self.bigTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:self.indexPath.section inSection:0]]];
if (!isTop) {
[self.bigTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.indexPath.section inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
}
// [self.bigTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.indexPath.section inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
[self.smallTableView reloadData];
[self.bigTableView reloadData];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
if (self.bigTableView == scrollView) {
return;
}
[self.bigTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.indexPath.section inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
}