iOS 展开和折叠UITableViewCells
示例
在情节提要中，在UIViewController上添加一个UITableView对象，并使其覆盖整个视图。设置UITableviewDataSource和UITableviewDelegate连接。
目标C
在您的.h档案中
NSMutableArray *arrayForBool; NSMutableArray *sectionTitleArray;
在您的.m档案中
- (void)viewDidLoad {
[super viewDidLoad];
arrayForBool = [[NSMutableArray alloc] init];
sectionTitleArray = @[@"Sam",@"Sanju",@"John",@"Staffy"];
for (int i=0; i<[sectionTitleArray count]; i++) {
[arrayForBool addObject:[NSNumber numberWithBool:NO]];
}
_tableView.dataSource = self;
_tableView.delegate = self;
}
//声明节中的行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if ([[arrayForBool objectAtIndex:section] boolValue]) {
return section+2;
} else {
return 0;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellid=@"hello";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellid];
if (cell==nil) {
cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellid];
}
BOOL manyCells = [[arrayForBool objectAtIndex:indexPath.section] boolValue];
/** If the section supposed to be closed******/
if(!manyCells){
cell.backgroundColor=[UIColor clearColor];
cell.textLabel.text=@"";
}
/** If the section supposed to be Opened******/
else{
cell.textLabel.text=[NSString stringWithFormat:@"%@ %d",[sectionTitleArray objectAtIndex:indexPath.section],indexPath.row+1];
cell.backgroundColor=[UIColor whiteColor];
cell.selectionStyle=UITableViewCellSelectionStyleNone ;
}
cell.textLabel.textColor=[UIColor blackColor];
/** Add a custom Separator with cell*/
UIView* separatorLineView = [[UIView alloc]initWithFrame:CGRectMake(15, 40, _expandableTableView.frame.size.width-15, 1)];
separatorLineView.backgroundColor = [UIColor blackColor];
[cell.contentView addSubview:separatorLineView];
return cell;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [sectionTitleArray count];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
/*************** Close the section, once the data is selected ***********************************/
[arrayForBool replaceObjectAtIndex:indexPath.section withObject:[NSNumber numberWithBool:NO]];
[_expandableTableView reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationAutomatic];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([[arrayForBool objectAtIndex:indexPath.section] boolValue]) {
return 40;
}
return 0;
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView *sectionView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 280,40)];
sectionView.tag=section;
UILabel *viewLabel=[[UILabel alloc]initWithFrame:CGRectMake(10, 0, _expandableTableView.frame.size.width-10, 40)];
viewLabel.backgroundColor=[UIColor clearColor];
viewLabel.textColor=[UIColor blackColor];
viewLabel.font=[UIFont systemFontOfSize:15];
viewLabel.text=[NSString stringWithFormat:@"List of %@",[sectionTitleArray objectAtIndex:section]];
[sectionView addSubview:viewLabel];
/********** Add a custom Separator with Section view *******************/
UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(15, 40, _expandableTableView.frame.size.width-15, 1)];
separatorLineView.backgroundColor = [UIColor blackColor];
[sectionView addSubview:separatorLineView];
/********** Add UITapGestureRecognizer to SectionView **************/
UITapGestureRecognizer *headerTapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sectionHeaderTapped:)];
[sectionView addGestureRecognizer:headerTapped];
return sectionView;
}
- (void)sectionHeaderTapped:(UITapGestureRecognizer *)gestureRecognizer{
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:gestureRecognizer.view.tag];
if (indexPath.row == 0) {
BOOL collapsed = [[arrayForBool objectAtIndex:indexPath.section] boolValue];
for (int i=0; i<[sectionTitleArray count]; i++) {
if (indexPath.section==i) {
[arrayForBool replaceObjectAtIndex:i withObject:[NSNumber numberWithBool:!collapsed]];
}
}
[_expandableTableView reloadSections:[NSIndexSet indexSetWithIndex:gestureRecognizer.view.tag] withRowAnimation:UITableViewRowAnimationAutomatic];
}
}