请查看代码：
ViewControlller.h
@property (nonatomic, strong) IBOutlet UITableView *tablevw;
@property (nonatomic , strong) IBOutlet UIButton *minusBtn;
-(IBAction)minusBtnAction:(id)sender;
ViewController.m
@interface ViewController ()
{
NSArray *sectionTitleArray;
NSMutableArray *arrayForBool;
NSArray *applesArray;
NSArray *grapesArray;
UIButton *button;
int clickedIndex;
}
- (void)viewDidLoad
{
[super viewDidLoad];
_tablevw.delegate = self;
_tablevw.dataSource =self;
_tablevw.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
_tablevw.separatorStyle = UITableViewCellSeparatorStyleNone;
[UIView setAnimationsEnabled:NO];
arrayForBool = [[NSMutableArray alloc]init];
clickedIndex = 0;
sectionTitleArray = @[ @{@"text": @"Apples"},
@{@"text": @"Grapes"},
];
applesArray = @[ @{@"text1": @"Apple1"},
@{@"text1": @"Apple2"},
@{@"text1": @"Apple3"},
@{@"text1": @"Apple4"},
@{@"text1": @"Apple5"},
@{@"text1": @"Apple6"},
@{@"text1": @"Apple7"},
@{@"text1": @"Apple8"},
];
grapesArray = @[ @{@"text2": @"Grapes1"},
@{@"text2": @"Grapes2"},
@{@"text2": @"Grapes3"},
@{@"text2": @"Grapes4"},
@{@"text2": @"Grapes5"},
@{@"text2": @"Grapes6"},
@{@"text2": @"Grapes7"},
@{@"text2": @"Grapes8"},
];
for (int i=0; i<[sectionTitleArray count]; i++)
{
[arrayForBool addObject:[NSNumber numberWithBool:NO]];
}
}
#pragma mark:- UITableView Delegate and Datasource Methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return sectionTitleArray.count;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if ([[arrayForBool objectAtIndex:section] boolValue])
{
if (section == 0)
{
return [applesArray count];
}
else if (section == 1)
{
return [grapesArray count];
}
}
return 1;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
cell.textLabel.textColor = [UIColor purpleColor];
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
BOOL manyCells = [[arrayForBool objectAtIndex:indexPath.section]boolValue];
if (!manyCells)
{
cell.backgroundColor = [UIColor clearColor];
cell.textLabel.text = @"";
}
else
{
if (indexPath.section == 0)
{
cell.textLabel.text = [[applesArray objectAtIndex:indexPath.row]objectForKey:@"text1"];
}
else if (indexPath.section == 1)
{
cell.textLabel.text = [[grapesArray objectAtIndex:indexPath.row]objectForKey:@"text2"];
}
}
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
/*************** Close the section, once the data is selected ***********************************/
[arrayForBool replaceObjectAtIndex:indexPath.section withObject:[NSNumber numberWithBool:NO]];
[_tablevw reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationAutomatic];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([[arrayForBool objectAtIndex:indexPath.section] boolValue])
{
return 40;
}
return 0;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 40;
}
#pragma mark - Creating View for TableView Section
- (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(13, 0, _tablevw.frame.size.width-10, 40)];
viewLabel.backgroundColor=[UIColor clearColor];
viewLabel.font=[UIFont systemFontOfSize:15];
viewLabel.text= [[sectionTitleArray objectAtIndex:section] objectForKey:@"text"];
viewLabel.textColor=[UIColor purpleColor];
[sectionView addSubview:viewLabel];
/********** Add a custom Separator with Section view *******************/
UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(12, 40, _tablevw.frame.size.width-35, 1)];
separatorLineView.backgroundColor = [UIColor purpleColor];
[sectionView addSubview:separatorLineView];
button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"Add_plus_iCon_iphone_4s"] forState:UIControlStateNormal];
button.frame = CGRectMake(sectionView.frame.size.width-10, 10, 20, 20);
[sectionView addSubview:button];
/********** Add UITapGestureRecognizer to SectionView **************/
UITapGestureRecognizer *headerTapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sectionHeaderTapped:)];
[sectionView addGestureRecognizer:headerTapped];
return sectionView;
}
#pragma mark - Table header gesture tapped
- (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]];
}
}
[_tablevw reloadSections:[NSIndexSet indexSetWithIndex:gestureRecognizer.view.tag] withRowAnimation:UITableViewRowAnimationAutomatic];
}
if (clickedIndex == 0)
{
clickedIndex++;
[button setImage:[UIImage imageNamed:@"Add_minus_iCon_iphone_4s"] forState:UIControlStateNormal];
}
else
{
clickedIndex = 0;
[button setImage:[UIImage imageNamed:@"Add_plus_iCon_iphone_4s"] forState:UIControlStateNormal];
}
[_tablevw reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
}
-(IBAction)minusBtnAction:(id)sender
{
if (clickedIndex == 0)
{
clickedIndex++;
[_minusBtn setImage:[UIImage imageNamed:@"ic_minus"] forState:UIControlStateNormal];
}
else
{
clickedIndex = 0;
[_minusBtn setImage:[UIImage imageNamed:@"ic_plus"] forState:UIControlStateNormal];
}
}
我点击+按钮时tableview中有两行，applesArray中的对象正在展开和折叠。默认情况下，+符号将显示在每个单元格上。如果我点击第一个按钮将更改为 - 并且tableview单元格将展开。
在我的导航栏中使用相同的方式，我有ic_minus图像和按钮背景。当按钮处于ic_minus状态时，所有部分都应显示正常，即应显示苹果和葡萄。
之后，当我点击ic_minus按钮时，它应该变成ic_plus图像，并且所有部分都应该扩展，它们的行对象如苹果与苹果1，苹果2 ...... apple8应该扩展，与grapeArray一样。< / p>